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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_9EB8E358252CAC4752C653F41239FAFB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CapitalAdditionsMember_FCBB33FAB4BB2BD446C253F412391A97_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalAdditionsMember_FCBB33FAB4BB2BD446C253F412391A97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital Addition Purchase Commitments</link:label>
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    <link:label id="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_3C6B219B351C525CFBF453F4123AC58F_label_en-US" xlink:label="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_3C6B219B351C525CFBF453F4123AC58F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecorded Unconditional Purchase Obligation [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_3C6B219B351C525CFBF453F4123AC58F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear_AE6E096B2DA45255313153F4123AF58B_label_en-US" xlink:label="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear_AE6E096B2DA45255313153F4123AF58B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear_AE6E096B2DA45255313153F4123AF58B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary_7BC082380BD804E2E31953F4123AFB08_verboseLabel_en-US" xlink:label="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary_7BC082380BD804E2E31953F4123AFB08" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_11775F86E9AEBF5FA2DAF955B2F9D088" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseCashCollateralFromCounterparties_DD7D63104D54E83341F3F955B2F9E264_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseCashCollateralFromCounterparties_DD7D63104D54E83341F3F955B2F9E264" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash collateral received from derivative counterparties</link:label>
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    <link:label id="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_4E2FCE5E47C258BA4B8EF955B2F9B943_label_en-US" xlink:label="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_4E2FCE5E47C258BA4B8EF955B2F9B943" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Operating Activities, Cash Flow Statement</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_A582DA0BCC56FC34D1A1F955B2F9BF9E_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_A582DA0BCC56FC34D1A1F955B2F9BF9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_A582DA0BCC56FC34D1A1F955B2F9BF9E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_9BA6B85542A64F9E9CDBF955B2F90038_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_9BA6B85542A64F9E9CDBF955B2F90038" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Fair value of fuel derivatives</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_ED4F7FD7C41120A759BDF955B2F9CA87_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_ED4F7FD7C41120A759BDF955B2F9CA87" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
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    <link:label id="lab_us-gaap_PaymentsForConstructionInProcess_570C5331CEB4B9A3FCA2F955B2FD6474_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForConstructionInProcess_570C5331CEB4B9A3FCA2F955B2FD6474" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Assets constructed for others</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_88B71F2F7E9DC706E9D1F955B2FDF1DF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_E40AA7100C46C9FB2463FEFF90A357D8_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_E40AA7100C46C9FB2463FEFF90A357D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Recurring [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_E40AA7100C46C9FB2463FEFF90A357D8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_317AD91DAA31BE46D2CEFEFF90A4161E_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_317AD91DAA31BE46D2CEFEFF90A4161E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Quoted prices in active markets for identical assets (Level 1)</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_317AD91DAA31BE46D2CEFEFF90A4161E_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_317AD91DAA31BE46D2CEFEFF90A4161E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_317AD91DAA31BE46D2CEFEFF90A4161E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel1Member_317AD91DAA31BE46D2CEFEFF90A4161E" xlink:to="lab_us-gaap_FairValueInputsLevel1Member_317AD91DAA31BE46D2CEFEFF90A4161E" xlink:type="arc" />
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    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_9FBAC5DE1F65C6F1844EFEFF90A4281C_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_9FBAC5DE1F65C6F1844EFEFF90A4281C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 2 [Member]</link:label>
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    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_D86FD61DB900AB970775FEFF90A5A571_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_D86FD61DB900AB970775FEFF90A5A571" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_D86FD61DB900AB970775FEFF90A5A571" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsAbstract_678D2001CDF48DF1B47BFEFF90A5FF2F_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_678D2001CDF48DF1B47BFEFF90A5FF2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_678D2001CDF48DF1B47BFEFF90A5FF2F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_438BBC3B015CCAE8CAEBFEFF90A5C0C6_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsFairValueDisclosure_438BBC3B015CCAE8CAEBFEFF90A5C0C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_438BBC3B015CCAE8CAEBFEFF90A5C0C6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue_A77679A518541A8113E9FEFF90A53223_terseLabel_en-US" xlink:label="lab_us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue_A77679A518541A8113E9FEFF90A53223" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury bills</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue_A77679A518541A8113E9FEFF90A53223" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InvestmentsFairValueDisclosure_EAD7319F349029ED6E98FEFF90A598E3_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsFairValueDisclosure_EAD7319F349029ED6E98FEFF90A598E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments</link:label>
    <link:label id="lab_us-gaap_InvestmentsFairValueDisclosure_EAD7319F349029ED6E98FEFF90A598E3_label_en-US" xlink:label="lab_us-gaap_InvestmentsFairValueDisclosure_EAD7319F349029ED6E98FEFF90A598E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_EAD7319F349029ED6E98FEFF90A598E3" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_03D8096F80FC26D30E1AFEFF90A64DB7" xlink:type="locator" />
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    <link:label id="lab_luv_FuelDerivativeAssetsAbstract_04492A9B499D29A48C33FEFF90A673C4_terseLabel_en-US" xlink:label="lab_luv_FuelDerivativeAssetsAbstract_04492A9B499D29A48C33FEFF90A673C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fuel derivatives:</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAbstract_B758CFC14DE2D33F5A38FEFF90A791EF_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract_B758CFC14DE2D33F5A38FEFF90A791EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_B758CFC14DE2D33F5A38FEFF90A791EF" xlink:type="locator" />
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    <link:label id="lab_luv_LeaseRightofUseAsset_9E3B1F1D843ECEDF2EB0DAFB945A5388_label_en-US" xlink:label="lab_luv_LeaseRightofUseAsset_9E3B1F1D843ECEDF2EB0DAFB945A5388" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Right of Use Asset</link:label>
    <link:label id="lab_luv_LeaseRightofUseAsset_9E3B1F1D843ECEDF2EB0DAFB945A5388_documentation_en-US" xlink:label="lab_luv_LeaseRightofUseAsset_9E3B1F1D843ECEDF2EB0DAFB945A5388" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lease Right of Use Asset</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LeaseRightofUseAsset" xlink:label="loc_luv_LeaseRightofUseAsset_9E3B1F1D843ECEDF2EB0DAFB945A5388" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_LeaseRightofUseAsset_9E3B1F1D843ECEDF2EB0DAFB945A5388" xlink:to="lab_luv_LeaseRightofUseAsset_9E3B1F1D843ECEDF2EB0DAFB945A5388" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_394548DAAE157EE43AE2DAFB945AAC63_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_394548DAAE157EE43AE2DAFB945AAC63" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current operating lease liabilities</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_394548DAAE157EE43AE2DAFB945AAC63_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_394548DAAE157EE43AE2DAFB945AAC63" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_394548DAAE157EE43AE2DAFB945AAC63" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityCurrent_394548DAAE157EE43AE2DAFB945AAC63" xlink:to="lab_us-gaap_OperatingLeaseLiabilityCurrent_394548DAAE157EE43AE2DAFB945AAC63" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_04D76851974301376615DAFB945AD46F_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_04D76851974301376615DAFB945AD46F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease, current maturities of long-term debt</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_04D76851974301376615DAFB945AD46F_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_04D76851974301376615DAFB945AD46F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_04D76851974301376615DAFB945AD46F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityCurrent_04D76851974301376615DAFB945AD46F" xlink:to="lab_us-gaap_FinanceLeaseLiabilityCurrent_04D76851974301376615DAFB945AD46F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_958E8590B6EC765E5950DAFB945A5D9E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_958E8590B6EC765E5950DAFB945A5D9E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncurrent operating lease liabilities</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_958E8590B6EC765E5950DAFB945A5D9E_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_958E8590B6EC765E5950DAFB945A5D9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_958E8590B6EC765E5950DAFB945A5D9E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_958E8590B6EC765E5950DAFB945A5D9E" xlink:to="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_958E8590B6EC765E5950DAFB945A5D9E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_F650AECE9145180F5440DAFB945ADF6F_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_F650AECE9145180F5440DAFB945ADF6F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease, long-term debt less current maturities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_F650AECE9145180F5440DAFB945ADF6F_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_F650AECE9145180F5440DAFB945ADF6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_F650AECE9145180F5440DAFB945ADF6F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_F650AECE9145180F5440DAFB945ADF6F" xlink:to="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_F650AECE9145180F5440DAFB945ADF6F" xlink:type="arc" />
    <link:label id="lab_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548_terseLabel_en-US" xlink:label="lab_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total lease liabilities</link:label>
    <link:label id="lab_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548_label_en-US" xlink:label="lab_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Liability</link:label>
    <link:label id="lab_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548_documentation_en-US" xlink:label="lab_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lease Liability</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LeaseLiability" xlink:label="loc_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548" xlink:to="lab_luv_LeaseLiability_53EA03BCC39FCD651DE2DAFB945A7548" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E5CF9D70F2FAE254691BDAFB945A4644_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E5CF9D70F2FAE254691BDAFB945A4644" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less allowance for depreciation and amortization</link:label>
    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E5CF9D70F2FAE254691BDAFB945A4644_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E5CF9D70F2FAE254691BDAFB945A4644" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E5CF9D70F2FAE254691BDAFB945A4644" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E5CF9D70F2FAE254691BDAFB945A4644" xlink:to="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E5CF9D70F2FAE254691BDAFB945A4644" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtAbstract_2B491663ED6A10384AFE53F4159734D1_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAbstract_2B491663ED6A10384AFE53F4159734D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Unclassified [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAbstract" xlink:label="loc_us-gaap_LongTermDebtAbstract_2B491663ED6A10384AFE53F4159734D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtAbstract_2B491663ED6A10384AFE53F4159734D1" xlink:to="lab_us-gaap_LongTermDebtAbstract_2B491663ED6A10384AFE53F4159734D1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtTextBlock_669828D22B1262D153D353F415974EB6_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_669828D22B1262D153D353F415974EB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebtTextBlock_669828D22B1262D153D353F415974EB6_label_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_669828D22B1262D153D353F415974EB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtTextBlock" xlink:label="loc_us-gaap_LongTermDebtTextBlock_669828D22B1262D153D353F415974EB6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtTextBlock_669828D22B1262D153D353F415974EB6" xlink:to="lab_us-gaap_LongTermDebtTextBlock_669828D22B1262D153D353F415974EB6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeTable_258FE1834EB31581752A53F4152E6B2F_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeTable_258FE1834EB31581752A53F4152E6B2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative [Table]</link:label>
    <link:label id="lab_us-gaap_DerivativeTable_258FE1834EB31581752A53F4152E6B2F_label_en-US" xlink:label="lab_us-gaap_DerivativeTable_258FE1834EB31581752A53F4152E6B2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_258FE1834EB31581752A53F4152E6B2F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeTable_258FE1834EB31581752A53F4152E6B2F" xlink:to="lab_us-gaap_DerivativeTable_258FE1834EB31581752A53F4152E6B2F" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLineItems_7760914E8D30DC46C19753F4153113A2_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_7760914E8D30DC46C19753F4153113A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:label id="lab_us-gaap_DerivativeLineItems_7760914E8D30DC46C19753F4153113A2_label_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_7760914E8D30DC46C19753F4153113A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_7760914E8D30DC46C19753F4153113A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLineItems_7760914E8D30DC46C19753F4153113A2" xlink:to="lab_us-gaap_DerivativeLineItems_7760914E8D30DC46C19753F4153113A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_DA452C799A956675E54053F41531484D_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_DA452C799A956675E54053F41531484D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash collateral deposits held from CP for fuel contracts - current</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_DA452C799A956675E54053F41531484D_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_DA452C799A956675E54053F41531484D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Collateral, Obligation to Return Cash, Offset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_DA452C799A956675E54053F41531484D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_DA452C799A956675E54053F41531484D" xlink:to="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_DA452C799A956675E54053F41531484D" xlink:type="arc" />
    <link:label id="lab_luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset_C22360342EAFE6F8475253F4153163CC_terseLabel_en-US" xlink:label="lab_luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset_C22360342EAFE6F8475253F4153163CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash collateral deposits held from CP for fuel contracts - non-current</link:label>
    <link:label id="lab_luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset_C22360342EAFE6F8475253F4153163CC_label_en-US" xlink:label="lab_luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset_C22360342EAFE6F8475253F4153163CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset</link:label>
    <link:label id="lab_luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset_C22360342EAFE6F8475253F4153163CC_documentation_en-US" xlink:label="lab_luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset_C22360342EAFE6F8475253F4153163CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Derivative Asset Noncurrent Collateral Obligation To Return Cash Offset</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset" xlink:label="loc_luv_DerivativeAssetNoncurrentCollateralObligationToReturnCashOffset_C22360342EAFE6F8475253F4153163CC" xlink:type="locator" />
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    <link:label id="lab_luv_CollateralAlreadyPostedAggregateFairValueNoncurrent_44503B6E86D3522AB78053F41532AA6B_terseLabel_en-US" xlink:label="lab_luv_CollateralAlreadyPostedAggregateFairValueNoncurrent_44503B6E86D3522AB78053F41532AA6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collateral Already Posted Aggregate Fair Value Noncurrent</link:label>
    <link:label id="lab_luv_CollateralAlreadyPostedAggregateFairValueNoncurrent_44503B6E86D3522AB78053F41532AA6B_label_en-US" xlink:label="lab_luv_CollateralAlreadyPostedAggregateFairValueNoncurrent_44503B6E86D3522AB78053F41532AA6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collateral Already Posted Aggregate Fair Value Noncurrent</link:label>
    <link:label id="lab_luv_CollateralAlreadyPostedAggregateFairValueNoncurrent_44503B6E86D3522AB78053F41532AA6B_documentation_en-US" xlink:label="lab_luv_CollateralAlreadyPostedAggregateFairValueNoncurrent_44503B6E86D3522AB78053F41532AA6B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total cash that is already posted, at the end of the reporting period, as noncurrent collateral for derivative instruments with credit-risk-related contingent features.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CollateralAlreadyPostedAggregateFairValueNoncurrent" xlink:label="loc_luv_CollateralAlreadyPostedAggregateFairValueNoncurrent_44503B6E86D3522AB78053F41532AA6B" xlink:type="locator" />
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    <link:label id="lab_luv_DueToThirdPartiesForSettledFuelContracts_3D6D72E8251BBD8311FD53F41532E969_terseLabel_en-US" xlink:label="lab_luv_DueToThirdPartiesForSettledFuelContracts_3D6D72E8251BBD8311FD53F41532E969" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due to third parties for fuel contracts</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_A26877E537F282EB2A1EE0A62DE2714A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_38FE655D208AD2FAB285E0A62DE383D5_verboseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_38FE655D208AD2FAB285E0A62DE383D5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears_DE199F656AFCD9656FC3E0A62DE51651" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears_DE199F656AFCD9656FC3E0A62DE51651" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears_DE199F656AFCD9656FC3E0A62DE51651" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_752CA5BBC74DAF5E52D2E0A62DE522F7_negatedLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_752CA5BBC74DAF5E52D2E0A62DE522F7" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_752CA5BBC74DAF5E52D2E0A62DE522F7_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_752CA5BBC74DAF5E52D2E0A62DE522F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Receivable, in Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_752CA5BBC74DAF5E52D2E0A62DE522F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_752CA5BBC74DAF5E52D2E0A62DE522F7" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears_752CA5BBC74DAF5E52D2E0A62DE522F7" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_F215294A9F327493878CE0A62DE5F9D1_negatedLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_F215294A9F327493878CE0A62DE5F9D1" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_F215294A9F327493878CE0A62DE5F9D1_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_F215294A9F327493878CE0A62DE5F9D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Receivable, in Four Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_F215294A9F327493878CE0A62DE5F9D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_F215294A9F327493878CE0A62DE5F9D1" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears_F215294A9F327493878CE0A62DE5F9D1" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_16CC91FEAE862814217CE0A62DE5A0D4_negatedLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_16CC91FEAE862814217CE0A62DE5A0D4" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_16CC91FEAE862814217CE0A62DE5A0D4_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_16CC91FEAE862814217CE0A62DE5A0D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Receivable, in Five Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_16CC91FEAE862814217CE0A62DE5A0D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_16CC91FEAE862814217CE0A62DE5A0D4" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears_16CC91FEAE862814217CE0A62DE5A0D4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter_9FD48CB9A35650DB2DE5E0A62DE5E63E_negatedLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter_9FD48CB9A35650DB2DE5E0A62DE5E63E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter_9FD48CB9A35650DB2DE5E0A62DE5E63E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable_3E16E81E05EA877C45E3E0A62DE5A6B2_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable_3E16E81E05EA877C45E3E0A62DE5A6B2" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total minimum lease payments</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable_3E16E81E05EA877C45E3E0A62DE5A6B2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9A290CCCA2B56B5BCB58E0A62DE6C55C_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9A290CCCA2B56B5BCB58E0A62DE6C55C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Operating Leased Assets [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9A290CCCA2B56B5BCB58E0A62DE6C55C_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9A290CCCA2B56B5BCB58E0A62DE6C55C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Operating Leased Assets [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9A290CCCA2B56B5BCB58E0A62DE6C55C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LeaseArrangementTypeAxis_AD5E540D1E1EE2BFB5D7E0A62DE66B20_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_AD5E540D1E1EE2BFB5D7E0A62DE66B20" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease Arrangement, Type [Axis]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseArrangementTypeAxis" xlink:label="loc_us-gaap_LeaseArrangementTypeAxis_AD5E540D1E1EE2BFB5D7E0A62DE66B20" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LeaseArrangementTypeDomain_0EFC29D0C0B614A07C3DE0A62DE6467C_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_0EFC29D0C0B614A07C3DE0A62DE6467C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease Arrangement, Type [Domain]</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_8FE07494AAC607CF9B9AE0A62DE88608_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_8FE07494AAC607CF9B9AE0A62DE88608" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due Thereafter</link:label>
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    <link:label id="lab_luv_OperatingLeasesFutureMinimumPaymentsNetCurrent_33D0A088E48D34F0D944E0A62DE8A90C_label_en-US" xlink:label="lab_luv_OperatingLeasesFutureMinimumPaymentsNetCurrent_33D0A088E48D34F0D944E0A62DE8A90C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases Future Minimum Payments Net Current</link:label>
    <link:label id="lab_luv_OperatingLeasesFutureMinimumPaymentsNetCurrent_33D0A088E48D34F0D944E0A62DE8A90C_documentation_en-US" xlink:label="lab_luv_OperatingLeasesFutureMinimumPaymentsNetCurrent_33D0A088E48D34F0D944E0A62DE8A90C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Future rental payments, net due within one year of the balance sheet date under an operating lease.</link:label>
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    <link:label id="lab_luv_OperatingLeasesFutureMinimumPaymentsNetInTwoYears_AEEDB24A99286FF50400E0A62DE9D5C0_documentation_en-US" xlink:label="lab_luv_OperatingLeasesFutureMinimumPaymentsNetInTwoYears_AEEDB24A99286FF50400E0A62DE9D5C0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Future rental payments, net due within the second year of the balance sheet date under an operating lease.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_OperatingLeasesFutureMinimumPaymentsNetInTwoYears" xlink:label="loc_luv_OperatingLeasesFutureMinimumPaymentsNetInTwoYears_AEEDB24A99286FF50400E0A62DE9D5C0" xlink:type="locator" />
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    <link:label id="lab_luv_OperatingLeasesFutureMinimumPaymentsNetInThreeYears_74F0EC34EB25C25F974BE0A62DE9BE1C_documentation_en-US" xlink:label="lab_luv_OperatingLeasesFutureMinimumPaymentsNetInThreeYears_74F0EC34EB25C25F974BE0A62DE9BE1C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Future rental payments, net due within the third year of the balance sheet date under an operating lease.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_E99B5410F2F9542AF38053F41273740E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_037EB450EFE37899120453F4127328B4_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_037EB450EFE37899120453F4127328B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_037EB450EFE37899120453F4127328B4_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_037EB450EFE37899120453F4127328B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Liability, Payments, Due Year Two</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_A375B1883AC513F94C2A53F412735999_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_A375B1883AC513F94C2A53F412735999" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_8E8D42831EC457CF2C7153F41273BD69_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_8E8D42831EC457CF2C7153F41273BD69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2022</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_DALMember_5FC1F6F743D5708E1FD153F41586D1C3" xlink:to="lab_luv_DALMember_5FC1F6F743D5708E1FD153F41586D1C3" xlink:type="arc" />
    <link:label id="lab_luv_SupplementalFinancialDataLineItems_B57A5C1F0FA3CC0A490F53F415885D1E_terseLabel_en-US" xlink:label="lab_luv_SupplementalFinancialDataLineItems_B57A5C1F0FA3CC0A490F53F415885D1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental Financial Data [Line Items]</link:label>
    <link:label id="lab_luv_SupplementalFinancialDataLineItems_B57A5C1F0FA3CC0A490F53F415885D1E_label_en-US" xlink:label="lab_luv_SupplementalFinancialDataLineItems_B57A5C1F0FA3CC0A490F53F415885D1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Financial Data [Line Items]</link:label>
    <link:label id="lab_luv_SupplementalFinancialDataLineItems_B57A5C1F0FA3CC0A490F53F415885D1E_documentation_en-US" xlink:label="lab_luv_SupplementalFinancialDataLineItems_B57A5C1F0FA3CC0A490F53F415885D1E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Line Items] for Supplemental Financial Data [Table]</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_SupplementalFinancialDataLineItems" xlink:label="loc_luv_SupplementalFinancialDataLineItems_B57A5C1F0FA3CC0A490F53F415885D1E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrentAbstract_A5A4A61E1E9A66DAE1AD53F41588A067_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrentAbstract_A5A4A61E1E9A66DAE1AD53F41588A067" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent [Abstract]</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrentAbstract_A5A4A61E1E9A66DAE1AD53F41588A067_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrentAbstract_A5A4A61E1E9A66DAE1AD53F41588A067" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_A5A4A61E1E9A66DAE1AD53F41588A067" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrentAbstract_A5A4A61E1E9A66DAE1AD53F41588A067" xlink:to="lab_us-gaap_OtherLiabilitiesNoncurrentAbstract_A5A4A61E1E9A66DAE1AD53F41588A067" xlink:type="arc" />
    <link:label id="lab_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_04DE4B80394233A807C153F415882522_terseLabel_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_04DE4B80394233A807C153F415882522" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Postretirement obligation</link:label>
    <link:label id="lab_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_04DE4B80394233A807C153F415882522_label_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_04DE4B80394233A807C153F415882522" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liability, Defined Benefit Plan, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_04DE4B80394233A807C153F415882522" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_04DE4B80394233A807C153F415882522" xlink:to="lab_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_04DE4B80394233A807C153F415882522" xlink:type="arc" />
    <link:label id="lab_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233_terseLabel_en-US" xlink:label="lab_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-current lease-related obligations</link:label>
    <link:label id="lab_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233_label_en-US" xlink:label="lab_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncurrent Lease Related Obligations</link:label>
    <link:label id="lab_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233_documentation_en-US" xlink:label="lab_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition and for incentives for sublease transaction of aircraft.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_NoncurrentLeaseRelatedObligations" xlink:label="loc_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233" xlink:to="lab_luv_NoncurrentLeaseRelatedObligations_CED8ED64C05CF9D5F53D53F415899233" xlink:type="arc" />
    <link:label id="lab_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161_terseLabel_en-US" xlink:label="lab_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Permanently grounded aircraft liability noncurrent</link:label>
    <link:label id="lab_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161_label_en-US" xlink:label="lab_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Permanentlygroundedaircraftliabilitynoncurrent</link:label>
    <link:label id="lab_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161_documentation_en-US" xlink:label="lab_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Permanently grounded aircraft liability noncurrent</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_Permanentlygroundedaircraftliabilitynoncurrent" xlink:label="loc_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161" xlink:to="lab_luv_Permanentlygroundedaircraftliabilitynoncurrent_F551D3A73E70DFDFDAAA53F415894161" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_E589E9D83D65F259064953F4158AF0D5_terseLabel_en-US" xlink:label="lab_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_E589E9D83D65F259064953F4158AF0D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other deferred compensation</link:label>
    <link:label id="lab_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_E589E9D83D65F259064953F4158AF0D5_label_en-US" xlink:label="lab_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_E589E9D83D65F259064953F4158AF0D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent" xlink:label="loc_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_E589E9D83D65F259064953F4158AF0D5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_E589E9D83D65F259064953F4158AF0D5" xlink:to="lab_us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent_E589E9D83D65F259064953F4158AF0D5" xlink:type="arc" />
    <link:label id="lab_luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal_3C84855AA437FA3B5E6053F4158A38B1_terseLabel_en-US" xlink:label="lab_luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal_3C84855AA437FA3B5E6053F4158A38B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative contracts</link:label>
    <link:label id="lab_luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal_3C84855AA437FA3B5E6053F4158A38B1_label_en-US" xlink:label="lab_luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal_3C84855AA437FA3B5E6053F4158A38B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Amount Offset Against Collateral, Total</link:label>
    <link:label id="lab_luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal_3C84855AA437FA3B5E6053F4158A38B1_documentation_en-US" xlink:label="lab_luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal_3C84855AA437FA3B5E6053F4158A38B1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected to be offset against a right to receive collateral.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal" xlink:label="loc_luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal_3C84855AA437FA3B5E6053F4158A38B1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherSundryLiabilitiesNoncurrent_212DC300C35DB5D50B6553F4158A19E2_terseLabel_en-US" xlink:label="lab_us-gaap_OtherSundryLiabilitiesNoncurrent_212DC300C35DB5D50B6553F4158A19E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_OtherSundryLiabilitiesNoncurrent_212DC300C35DB5D50B6553F4158A19E2_label_en-US" xlink:label="lab_us-gaap_OtherSundryLiabilitiesNoncurrent_212DC300C35DB5D50B6553F4158A19E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Sundry Liabilities, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherSundryLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherSundryLiabilitiesNoncurrent_212DC300C35DB5D50B6553F4158A19E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherSundryLiabilitiesNoncurrent_212DC300C35DB5D50B6553F4158A19E2" xlink:to="lab_us-gaap_OtherSundryLiabilitiesNoncurrent_212DC300C35DB5D50B6553F4158A19E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_13063CD8D334436F799E53F4158AE7B5_totalLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_13063CD8D334436F799E53F4158AE7B5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Other noncurrent liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_13063CD8D334436F799E53F4158AE7B5_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_13063CD8D334436F799E53F4158AE7B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_13063CD8D334436F799E53F4158AE7B5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_13063CD8D334436F799E53F4158AE7B5" xlink:to="lab_us-gaap_OtherLiabilitiesNoncurrent_13063CD8D334436F799E53F4158AE7B5" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_50ADFA2DCB8ACF50D77E53F412F88315_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_50ADFA2DCB8ACF50D77E53F412F88315" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Comprehensive Income</link:label>
    <link:label id="lab_us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_50ADFA2DCB8ACF50D77E53F412F88315_label_en-US" xlink:label="lab_us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_50ADFA2DCB8ACF50D77E53F412F88315" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss) [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_50ADFA2DCB8ACF50D77E53F412F88315" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_50ADFA2DCB8ACF50D77E53F412F88315" xlink:to="lab_us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock_50ADFA2DCB8ACF50D77E53F412F88315" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_65601CDE4F785BDE66EE53F412F88D8F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_65601CDE4F785BDE66EE53F412F88D8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rollforward of the Amounts Included in AOCI, Net of Taxes</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_65601CDE4F785BDE66EE53F412F88D8F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_65601CDE4F785BDE66EE53F412F88D8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_65601CDE4F785BDE66EE53F412F88D8F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_65601CDE4F785BDE66EE53F412F88D8F" xlink:to="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_65601CDE4F785BDE66EE53F412F88D8F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_10D8372A48EF9EBFA09353F412F8DB85_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_10D8372A48EF9EBFA09353F412F8DB85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income</link:label>
    <link:label id="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_10D8372A48EF9EBFA09353F412F8DB85_label_en-US" xlink:label="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_10D8372A48EF9EBFA09353F412F8DB85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_10D8372A48EF9EBFA09353F412F8DB85" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_10D8372A48EF9EBFA09353F412F8DB85" xlink:to="lab_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock_10D8372A48EF9EBFA09353F412F8DB85" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_89E710474B8381CA6E9653F41365FEDE_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_89E710474B8381CA6E9653F41365FEDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_89E710474B8381CA6E9653F41365FEDE" xlink:type="locator" />
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    <link:label id="lab_srt_AircraftTypeAxis_54E17778DED225EB25A353F41366924D_terseLabel_en-US" xlink:label="lab_srt_AircraftTypeAxis_54E17778DED225EB25A353F41366924D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aircraft Type [Axis]</link:label>
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    <link:label id="lab_srt_B717200Member_A6CDA3D93766AF13DE7FE0A640F6CD8E_terseLabel_en-US" xlink:label="lab_srt_B717200Member_A6CDA3D93766AF13DE7FE0A640F6CD8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">B-717-200</link:label>
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    <link:label id="lab_luv_B7378MAXMember_FF99CC74CFF06B5FDA61E0A640F6B474_verboseLabel_en-US" xlink:label="lab_luv_B7378MAXMember_FF99CC74CFF06B5FDA61E0A640F6B474" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">737 MAX 8</link:label>
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    <link:label id="lab_luv_LesseeRenewalTerm_2D932677BCA14435B74DE0A640F7A08C_terseLabel_en-US" xlink:label="lab_luv_LesseeRenewalTerm_2D932677BCA14435B74DE0A640F7A08C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Renewal Term</link:label>
    <link:label id="lab_luv_LesseeRenewalTerm_2D932677BCA14435B74DE0A640F7A08C_label_en-US" xlink:label="lab_luv_LesseeRenewalTerm_2D932677BCA14435B74DE0A640F7A08C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Renewal Term</link:label>
    <link:label id="lab_luv_LesseeRenewalTerm_2D932677BCA14435B74DE0A640F7A08C_documentation_en-US" xlink:label="lab_luv_LesseeRenewalTerm_2D932677BCA14435B74DE0A640F7A08C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Renewal Term</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LesseeRenewalTerm" xlink:label="loc_luv_LesseeRenewalTerm_2D932677BCA14435B74DE0A640F7A08C" xlink:type="locator" />
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    <link:label id="lab_luv_LesseeOperatingandFinanceLeaseTermofContract_76C678B68F4D03F9D9B7E0A640F7F26E_terseLabel_en-US" xlink:label="lab_luv_LesseeOperatingandFinanceLeaseTermofContract_76C678B68F4D03F9D9B7E0A640F7F26E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee Operating and Finance Lease Term of Contract</link:label>
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    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits_8950D4FEEE8C7F43A266E0A640F75224_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits_8950D4FEEE8C7F43A266E0A640F75224" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease, Number of Units</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits_8950D4FEEE8C7F43A266E0A640F75224" xlink:type="locator" />
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    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty_FE060E8778EFC6AA3440E0AB0DC7738A_terseLabel_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty_FE060E8778EFC6AA3440E0AB0DC7738A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance Leases, Net Investment in Sales Type Leases, Contingent Payments on Leased Property</link:label>
    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty_FE060E8778EFC6AA3440E0AB0DC7738A_label_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty_FE060E8778EFC6AA3440E0AB0DC7738A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Leases, Net Investment in Sales Type Leases, Contingent Payments on Leased Property</link:label>
    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty_FE060E8778EFC6AA3440E0AB0DC7738A_documentation_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty_FE060E8778EFC6AA3440E0AB0DC7738A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Finance Leases, Net Investment in Sales Type Leases, Contingent Payments on Leased Property</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty" xlink:label="loc_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPaymentsonLeasedProperty_FE060E8778EFC6AA3440E0AB0DC7738A" xlink:type="locator" />
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    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty_39E3EA3131ECB3257F0DE0A6EA1501FC_terseLabel_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty_39E3EA3131ECB3257F0DE0A6EA1501FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance Leases, Net Investment in Sales Type Leases, Unguaranteed Residual Values of Leased Property</link:label>
    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty_39E3EA3131ECB3257F0DE0A6EA1501FC_label_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty_39E3EA3131ECB3257F0DE0A6EA1501FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Leases, Net Investment in Sales Type Leases, Unguaranteed Residual Values of Leased Property</link:label>
    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty_39E3EA3131ECB3257F0DE0A6EA1501FC_documentation_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty_39E3EA3131ECB3257F0DE0A6EA1501FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Finance Leases, Net Investment in Sales Type Leases, Unguaranteed Residual Values of Leased Property</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty" xlink:label="loc_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesUnguaranteedResidualValuesofLeasedProperty_39E3EA3131ECB3257F0DE0A6EA1501FC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SubleaseIncome_58C89B724B09A2A43A71E0A640F7E960_terseLabel_en-US" xlink:label="lab_us-gaap_SubleaseIncome_58C89B724B09A2A43A71E0A640F7E960" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sublease Income</link:label>
    <link:label id="lab_us-gaap_SubleaseIncome_58C89B724B09A2A43A71E0A640F7E960_label_en-US" xlink:label="lab_us-gaap_SubleaseIncome_58C89B724B09A2A43A71E0A640F7E960" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sublease Income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_58C89B724B09A2A43A71E0A640F7E960" xlink:type="locator" />
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    <link:label id="lab_luv_OperatingLeasesFutureMinimumPaymentsDueinSixYears_091080746E7F835E6494E0A640F8CEE8_terseLabel_en-US" xlink:label="lab_luv_OperatingLeasesFutureMinimumPaymentsDueinSixYears_091080746E7F835E6494E0A640F8CEE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sublease income - 2024</link:label>
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    <link:label id="lab_luv_SubleaseTerms_F964322CD35607C59388E0A640F9A276_label_en-US" xlink:label="lab_luv_SubleaseTerms_F964322CD35607C59388E0A640F9A276" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sublease Terms</link:label>
    <link:label id="lab_luv_SubleaseTerms_F964322CD35607C59388E0A640F9A276_documentation_en-US" xlink:label="lab_luv_SubleaseTerms_F964322CD35607C59388E0A640F9A276" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sublease Terms</link:label>
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    <link:label id="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_861CB631A4CD8DF2F843E0A640F953B0_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_861CB631A4CD8DF2F843E0A640F953B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecorded Unconditional Purchase Obligation</link:label>
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    <link:label id="lab_luv_LesseeOperatingLeaseLeaseNotyetCommenced_C8A9E1915718188A0D57E0A640F9227C_terseLabel_en-US" xlink:label="lab_luv_LesseeOperatingLeaseLeaseNotyetCommenced_C8A9E1915718188A0D57E0A640F9227C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Lease Not yet Commenced, Description</link:label>
    <link:label id="lab_luv_LesseeOperatingLeaseLeaseNotyetCommenced_C8A9E1915718188A0D57E0A640F9227C_label_en-US" xlink:label="lab_luv_LesseeOperatingLeaseLeaseNotyetCommenced_C8A9E1915718188A0D57E0A640F9227C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Lease Not yet Commenced</link:label>
    <link:label id="lab_luv_LesseeOperatingLeaseLeaseNotyetCommenced_C8A9E1915718188A0D57E0A640F9227C_documentation_en-US" xlink:label="lab_luv_LesseeOperatingLeaseLeaseNotyetCommenced_C8A9E1915718188A0D57E0A640F9227C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Lease Not yet Commenced</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LesseeOperatingLeaseLeaseNotyetCommenced" xlink:label="loc_luv_LesseeOperatingLeaseLeaseNotyetCommenced_C8A9E1915718188A0D57E0A640F9227C" xlink:type="locator" />
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    <link:label id="lab_luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal_7C15C0E7DE02AD9E6447E0A640F962D7_terseLabel_en-US" xlink:label="lab_luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal_7C15C0E7DE02AD9E6447E0A640F962D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject To Or Available For Lease, Number Of Units, Total</link:label>
    <link:label id="lab_luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal_7C15C0E7DE02AD9E6447E0A640F962D7_label_en-US" xlink:label="lab_luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal_7C15C0E7DE02AD9E6447E0A640F962D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Subject To Or Available For Lease, Number Of Units, Total</link:label>
    <link:label id="lab_luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal_7C15C0E7DE02AD9E6447E0A640F962D7_documentation_en-US" xlink:label="lab_luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal_7C15C0E7DE02AD9E6447E0A640F962D7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of units (items of property) under lease arrangements.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal" xlink:label="loc_luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal_7C15C0E7DE02AD9E6447E0A640F962D7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ResidualValueOfLeasedAsset_E6A4236D8ED14E93C4AAE0A640F93884_terseLabel_en-US" xlink:label="lab_us-gaap_ResidualValueOfLeasedAsset_E6A4236D8ED14E93C4AAE0A640F93884" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residual Value of Leased Asset</link:label>
    <link:label id="lab_us-gaap_ResidualValueOfLeasedAsset_E6A4236D8ED14E93C4AAE0A640F93884_label_en-US" xlink:label="lab_us-gaap_ResidualValueOfLeasedAsset_E6A4236D8ED14E93C4AAE0A640F93884" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residual Value of Leased Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResidualValueOfLeasedAsset" xlink:label="loc_us-gaap_ResidualValueOfLeasedAsset_E6A4236D8ED14E93C4AAE0A640F93884" xlink:type="locator" />
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    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPayments_1C709FC5802A01395652E0A640F97628_terseLabel_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPayments_1C709FC5802A01395652E0A640F97628" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance Leases, Contingent Payments</link:label>
    <link:label id="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPayments_1C709FC5802A01395652E0A640F97628_label_en-US" xlink:label="lab_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPayments_1C709FC5802A01395652E0A640F97628" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Leases, Net Investment in Sales Type Leases, Contingent Payments</link:label>
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    <link:loc xlink:href="luv-20190930.xsd#luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPayments" xlink:label="loc_luv_FinanceLeasesNetInvestmentinSalesTypeLeasesContingentPayments_1C709FC5802A01395652E0A640F97628" xlink:type="locator" />
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    <link:label id="lab_luv_LesseeOperatingLeaseTermsofContract_74D1C7C34627BB18FA33E0A640FA3CB8_terseLabel_en-US" xlink:label="lab_luv_LesseeOperatingLeaseTermsofContract_74D1C7C34627BB18FA33E0A640FA3CB8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee Operating Lease Terms of Contract</link:label>
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    <link:label id="lab_luv_LesseeOperatingLeaseTermsofContract_74D1C7C34627BB18FA33E0A640FA3CB8_documentation_en-US" xlink:label="lab_luv_LesseeOperatingLeaseTermsofContract_74D1C7C34627BB18FA33E0A640FA3CB8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lessee Operating Lease Terms of Contract</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LesseeOperatingLeaseTermsofContract" xlink:label="loc_luv_LesseeOperatingLeaseTermsofContract_74D1C7C34627BB18FA33E0A640FA3CB8" xlink:type="locator" />
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    <link:label id="lab_luv_OwnedAssetsNumberOfUnits_154CEF908C798BBF1123E0A640FA0545_terseLabel_en-US" xlink:label="lab_luv_OwnedAssetsNumberOfUnits_154CEF908C798BBF1123E0A640FA0545" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Owned Assets, Number of Units</link:label>
    <link:label id="lab_luv_OwnedAssetsNumberOfUnits_154CEF908C798BBF1123E0A640FA0545_label_en-US" xlink:label="lab_luv_OwnedAssetsNumberOfUnits_154CEF908C798BBF1123E0A640FA0545" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Owned Assets, Number of Units</link:label>
    <link:label id="lab_luv_OwnedAssetsNumberOfUnits_154CEF908C798BBF1123E0A640FA0545_documentation_en-US" xlink:label="lab_luv_OwnedAssetsNumberOfUnits_154CEF908C798BBF1123E0A640FA0545" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of units (items of property) owned.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_OwnedAssetsNumberOfUnits" xlink:label="loc_luv_OwnedAssetsNumberOfUnits_154CEF908C798BBF1123E0A640FA0545" xlink:type="locator" />
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    <link:label id="lab_luv_LeaseTermsForOwnedAircraft_5FF671478D420487B4CAE0A640FA47D5_terseLabel_en-US" xlink:label="lab_luv_LeaseTermsForOwnedAircraft_5FF671478D420487B4CAE0A640FA47D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease Terms For Owned Aircraft</link:label>
    <link:label id="lab_luv_LeaseTermsForOwnedAircraft_5FF671478D420487B4CAE0A640FA47D5_label_en-US" xlink:label="lab_luv_LeaseTermsForOwnedAircraft_5FF671478D420487B4CAE0A640FA47D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Terms For Owned Aircraft</link:label>
    <link:label id="lab_luv_LeaseTermsForOwnedAircraft_5FF671478D420487B4CAE0A640FA47D5_documentation_en-US" xlink:label="lab_luv_LeaseTermsForOwnedAircraft_5FF671478D420487B4CAE0A640FA47D5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Lease Terms For Owned Aircraft</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LeaseTermsForOwnedAircraft" xlink:label="loc_luv_LeaseTermsForOwnedAircraft_5FF671478D420487B4CAE0A640FA47D5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_2056D53A11029FE00872E0A640FA6C55_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_2056D53A11029FE00872E0A640FA6C55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract</link:label>
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    <link:label id="lab_luv_VolumeOfFuelHedgingDomain_424628DE7644035FB37F12E4E71EE63B_label_en-US" xlink:label="lab_luv_VolumeOfFuelHedgingDomain_424628DE7644035FB37F12E4E71EE63B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Volume of Fuel Hedging [Domain]</link:label>
    <link:label id="lab_luv_VolumeOfFuelHedgingDomain_424628DE7644035FB37F12E4E71EE63B_documentation_en-US" xlink:label="lab_luv_VolumeOfFuelHedgingDomain_424628DE7644035FB37F12E4E71EE63B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule of the volume of fuel hedging for the current year (including current and prior period actuals), as well as for future periods.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_VolumeOfFuelHedgingDomain" xlink:label="loc_luv_VolumeOfFuelHedgingDomain_424628DE7644035FB37F12E4E71EE63B" xlink:type="locator" />
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    <link:label id="lab_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95_terseLabel_en-US" xlink:label="lab_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remainder of Current Year</link:label>
    <link:label id="lab_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95_label_en-US" xlink:label="lab_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Year [Member]</link:label>
    <link:label id="lab_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95_documentation_en-US" xlink:label="lab_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Volume of fuel hedging for the remainder of the current year</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CurrentYearMember" xlink:label="loc_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95" xlink:to="lab_luv_CurrentYearMember_B8C2F931D4C032B232D112E4E71EBA95" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateSwaptionMember_03D8AB667D9F929F9EAD12E4E71E90DD_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateSwaptionMember_03D8AB667D9F929F9EAD12E4E71E90DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate swap</link:label>
    <link:label id="lab_us-gaap_InterestRateSwaptionMember_03D8AB667D9F929F9EAD12E4E71E90DD_label_en-US" xlink:label="lab_us-gaap_InterestRateSwaptionMember_03D8AB667D9F929F9EAD12E4E71E90DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swaption [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateSwaptionMember" xlink:label="loc_us-gaap_InterestRateSwaptionMember_03D8AB667D9F929F9EAD12E4E71E90DD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateSwaptionMember_03D8AB667D9F929F9EAD12E4E71E90DD" xlink:to="lab_us-gaap_InterestRateSwaptionMember_03D8AB667D9F929F9EAD12E4E71E90DD" xlink:type="arc" />
    <link:label id="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_E7C0B80A391EF35BEFB112E4E71E6C71_terseLabel_en-US" xlink:label="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_E7C0B80A391EF35BEFB112E4E71E6C71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash collateral provided by or held from CP</link:label>
    <link:label id="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_E7C0B80A391EF35BEFB112E4E71E6C71_label_en-US" xlink:label="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_E7C0B80A391EF35BEFB112E4E71E6C71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collateral Already Posted, Aggregate Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CollateralAlreadyPostedAggregateFairValue" xlink:label="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_E7C0B80A391EF35BEFB112E4E71E6C71" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_E7C0B80A391EF35BEFB112E4E71E6C71" xlink:to="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_E7C0B80A391EF35BEFB112E4E71E6C71" xlink:type="arc" />
    <link:label id="lab_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725_terseLabel_en-US" xlink:label="lab_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Rate Derivative</link:label>
    <link:label id="lab_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725_label_en-US" xlink:label="lab_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap Derivative, Aircraft Leases</link:label>
    <link:label id="lab_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725_documentation_en-US" xlink:label="lab_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swap Derivative, Aircraft Leases</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_InterestRateSwapDerivativeAircraftLeases" xlink:label="loc_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725" xlink:to="lab_luv_InterestRateSwapDerivativeAircraftLeases_4F5866E5A0017BF0466512E4E71E1725" xlink:type="arc" />
    <link:label id="lab_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784_terseLabel_en-US" xlink:label="lab_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Rate Swap Contract Length</link:label>
    <link:label id="lab_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784_label_en-US" xlink:label="lab_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap Contract Length</link:label>
    <link:label id="lab_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784_documentation_en-US" xlink:label="lab_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Interest Rate Swap Contract Length</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_InterestRateSwapContractLength" xlink:label="loc_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784" xlink:to="lab_luv_InterestRateSwapContractLength_86199956A270ADCAD23C12E4E71ED784" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeCostOfHedge_84EC4D76A955BFE5A0D112E4E71E5CA4_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeCostOfHedge_84EC4D76A955BFE5A0D112E4E71E5CA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Premiums paid for fuel derivative contracts</link:label>
    <link:label id="lab_us-gaap_DerivativeCostOfHedge_84EC4D76A955BFE5A0D112E4E71E5CA4_label_en-US" xlink:label="lab_us-gaap_DerivativeCostOfHedge_84EC4D76A955BFE5A0D112E4E71E5CA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Cost of Hedge</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeCostOfHedge" xlink:label="loc_us-gaap_DerivativeCostOfHedge_84EC4D76A955BFE5A0D112E4E71E5CA4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeCostOfHedge_84EC4D76A955BFE5A0D112E4E71E5CA4" xlink:to="lab_us-gaap_DerivativeCostOfHedge_84EC4D76A955BFE5A0D112E4E71E5CA4" xlink:type="arc" />
    <link:label id="lab_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD_terseLabel_en-US" xlink:label="lab_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of actual consumption hedged</link:label>
    <link:label id="lab_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD_label_en-US" xlink:label="lab_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of actual consumption hedged</link:label>
    <link:label id="lab_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD_documentation_en-US" xlink:label="lab_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of actual consumption hedged</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_Percentageofactualconsumptionhedged" xlink:label="loc_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD" xlink:to="lab_luv_Percentageofactualconsumptionhedged_57355AD265A4EB97E07212E4E71EDCCD" xlink:type="arc" />
    <link:label id="lab_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC_terseLabel_en-US" xlink:label="lab_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Hedge settlement losses recognized in Fuel and oil expense</link:label>
    <link:label id="lab_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC_label_en-US" xlink:label="lab_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Hedge settlement losses recognized in Fuel and oil expense</link:label>
    <link:label id="lab_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC_documentation_en-US" xlink:label="lab_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Hedge settlement losses recognized in Fuel and oil expense</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_HedgesettlementlossesrecognizedinFuelandoilexpense" xlink:label="loc_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC" xlink:to="lab_luv_HedgesettlementlossesrecognizedinFuelandoilexpense_888E025181AB175552D812E4E71E6CCC" xlink:type="arc" />
    <link:label id="lab_us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months_954DA9FDE22E7EE1EA1012E4E71E1707_terseLabel_en-US" xlink:label="lab_us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months_954DA9FDE22E7EE1EA1012E4E71E1707" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current Unrealized Net Losses in OCI</link:label>
    <link:label id="lab_us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months_954DA9FDE22E7EE1EA1012E4E71E1707_label_en-US" xlink:label="lab_us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months_954DA9FDE22E7EE1EA1012E4E71E1707" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months" xlink:label="loc_us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months_954DA9FDE22E7EE1EA1012E4E71E1707" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months_954DA9FDE22E7EE1EA1012E4E71E1707" xlink:to="lab_us-gaap_PriceRiskCashFlowHedgeUnrealizedGainLossToBeReclassifiedDuringNext12Months_954DA9FDE22E7EE1EA1012E4E71E1707" xlink:type="arc" />
    <link:label id="lab_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64_terseLabel_en-US" xlink:label="lab_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum sum of derivatives of counterparty to be included in other (less than $7 million)</link:label>
    <link:label id="lab_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64_label_en-US" xlink:label="lab_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Sum Of Derivatives Of Counterparty To Be Included In Other</link:label>
    <link:label id="lab_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64_documentation_en-US" xlink:label="lab_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum sum of derivatives of a counterparty to be included in Other and no risk of the Company posting collateral.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther" xlink:label="loc_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64" xlink:to="lab_luv_MaximumSumOfDerivativesOfCounterpartyToBeIncludedInOther_8E30262765969D312B1A12E4E71E8B64" xlink:type="arc" />
    <link:label id="lab_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272_terseLabel_en-US" xlink:label="lab_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum cash collateral provided as a percentage of derivative contract value (in hundredths)</link:label>
    <link:label id="lab_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272_label_en-US" xlink:label="lab_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts</link:label>
    <link:label id="lab_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272_documentation_en-US" xlink:label="lab_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents percentage of cash collateral provided on the fair value of fuel derivative contracts when credit rating is non-investment grade.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CashCollateralPercentOfFairValueFuelDerivativesContracts" xlink:label="loc_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272" xlink:to="lab_luv_CashCollateralPercentOfFairValueFuelDerivativesContracts_3BEEF39218049FB1907B12E4E71E9272" xlink:type="arc" />
    <link:label id="lab_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC_terseLabel_en-US" xlink:label="lab_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum letter of credit percent of collateral</link:label>
    <link:label id="lab_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC_label_en-US" xlink:label="lab_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit Percent of Collateral</link:label>
    <link:label id="lab_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC_documentation_en-US" xlink:label="lab_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of cash collateral that can be provided with a letter of credit.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LetterofCreditPercentofCollateral" xlink:label="loc_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC" xlink:to="lab_luv_LetterofCreditPercentofCollateral_03CCA10968719E94F92412E4E71E27BC" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage_F615231ABEC75F2E92E012E4E71E7684_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage_F615231ABEC75F2E92E012E4E71E7684" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percent of fuel consumption hedged</link:label>
    <link:label id="lab_us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage_F615231ABEC75F2E92E012E4E71E7684_label_en-US" xlink:label="lab_us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage_F615231ABEC75F2E92E012E4E71E7684" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage_F615231ABEC75F2E92E012E4E71E7684" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage_F615231ABEC75F2E92E012E4E71E7684" xlink:to="lab_us-gaap_DerivativeNonmonetaryNotionalAmountPercentOfRequiredNeedCoverage_F615231ABEC75F2E92E012E4E71E7684" xlink:type="arc" />
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0_terseLabel_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Option to substitute LC for cash Threshold 1</link:label>
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0_label_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Of Fuel Derivative Levels In Which Letters Of Credit May Be Substituted For Cash Threshold 1</link:label>
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0_documentation_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value Of Fuel Derivative Levels In Which Letters Of Credit May Be Substituted For Cash Threshold 1</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1" xlink:label="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0" xlink:to="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_833439BDC2064407432812E4E71E5DB0" xlink:type="arc" />
    <link:label id="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8_terseLabel_en-US" xlink:label="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Table]</link:label>
    <link:label id="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8_label_en-US" xlink:label="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Table]</link:label>
    <link:label id="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8_documentation_en-US" xlink:label="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Schedule of the agreements the Company had with counterparties in which cash deposits and/or pledged aircraft are required to be posted whenever the net fair value of derivatives associated with those counterparties exceeds specific thresholds. Includes the fair values of fuel derivatives, amounts posted as collateral, and applicable collateral posting threshold amounts at which such postings are triggered.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable" xlink:label="loc_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8" xlink:to="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsTable_24ADCDFF7BC64CFBEBD012E4E6A185F8" xlink:type="arc" />
    <link:label id="lab_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941_terseLabel_en-US" xlink:label="lab_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty A</link:label>
    <link:label id="lab_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941_label_en-US" xlink:label="lab_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty Alpha [Member]</link:label>
    <link:label id="lab_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941_documentation_en-US" xlink:label="lab_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Identification of counterparty with which the Company had an agreement to post collateral whenever the net fair value of derivatives associated with the counterparty exceeds specific thresholds.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CounterpartyAlphaMember" xlink:label="loc_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941" xlink:to="lab_luv_CounterpartyAlphaMember_7C34A05529A58042B20512E4E6A1A941" xlink:type="arc" />
    <link:label id="lab_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755_terseLabel_en-US" xlink:label="lab_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty B</link:label>
    <link:label id="lab_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755_label_en-US" xlink:label="lab_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty B [Member]</link:label>
    <link:label id="lab_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755_documentation_en-US" xlink:label="lab_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Identification of counterparty with which the Company had an agreement to post collateral whenever the net fair value of derivatives associated with the counterparty exceeds specific thresholds.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CounterpartyBMember" xlink:label="loc_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755" xlink:to="lab_luv_CounterpartyBMember_2E3E937B61963DD94B8C12E4E6A1D755" xlink:type="arc" />
    <link:label id="lab_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC_terseLabel_en-US" xlink:label="lab_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty C</link:label>
    <link:label id="lab_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC_label_en-US" xlink:label="lab_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty C [Member]</link:label>
    <link:label id="lab_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC_documentation_en-US" xlink:label="lab_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Identification of counterparty with which the Company had an agreement to post collateral whenever the net fair value of derivatives associated with the counterparty exceeds specific thresholds.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CounterpartyCMember" xlink:label="loc_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC" xlink:to="lab_luv_CounterpartyCMember_E9A3AD3AF2386E47662812E4E6A183CC" xlink:type="arc" />
    <link:label id="lab_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214_terseLabel_en-US" xlink:label="lab_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty D</link:label>
    <link:label id="lab_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214_label_en-US" xlink:label="lab_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty D [Member]</link:label>
    <link:label id="lab_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214_documentation_en-US" xlink:label="lab_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Identification of counterparty with which the Company had an agreement to post collateral whenever the net fair value of derivatives associated with the counterparty exceeds specific thresholds.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CounterpartyDMember" xlink:label="loc_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214" xlink:to="lab_luv_CounterpartyDMember_3D029E28FC200805660412E4E6A11214" xlink:type="arc" />
    <link:label id="lab_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322_terseLabel_en-US" xlink:label="lab_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty E</link:label>
    <link:label id="lab_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322_label_en-US" xlink:label="lab_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty E [Member]</link:label>
    <link:label id="lab_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322_documentation_en-US" xlink:label="lab_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Identification of counterparty with which the Company had an agreement to post collateral whenever the net fair value of derivatives associated with the counterparty exceeds specific thresholds.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CounterpartyEMember" xlink:label="loc_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322" xlink:to="lab_luv_CounterpartyEMember_37BEEFD3780C0C53659212E4E6A16322" xlink:type="arc" />
    <link:label id="lab_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649_terseLabel_en-US" xlink:label="lab_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty F</link:label>
    <link:label id="lab_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649_label_en-US" xlink:label="lab_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty F [Member]</link:label>
    <link:label id="lab_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649_documentation_en-US" xlink:label="lab_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Identification of counterparty with which the Company had an agreement to post collateral whenever the net fair value of derivatives associated with the counterparty exceeds specific thresholds.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CounterpartyFMember" xlink:label="loc_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649" xlink:to="lab_luv_CounterpartyFMember_9A008C7AD6D06235D98212E4E6A19649" xlink:type="arc" />
    <link:label id="lab_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3_terseLabel_en-US" xlink:label="lab_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty Other</link:label>
    <link:label id="lab_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3_label_en-US" xlink:label="lab_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty Other [Member]</link:label>
    <link:label id="lab_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3_documentation_en-US" xlink:label="lab_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The sum of remaining counterparties not separately identified, with which the Company has unsettled derivative instruments. These counterparties are considered individually immaterial in the consideration of derivatives outstanding and do not contain provisions in which the Company would have to post cash or other collateral based on potential changes in credit ratings or changes in the market value of outstanding derivative instruments.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_CounterpartyOtherMember" xlink:label="loc_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3" xlink:to="lab_luv_CounterpartyOtherMember_3B9C73513007E3AEFA2C12E4E6A105F3" xlink:type="arc" />
    <link:label id="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems_7C85E84EBFDC3ECE376212E4E6A12B6E_terseLabel_en-US" xlink:label="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems_7C85E84EBFDC3ECE376212E4E6A12B6E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]</link:label>
    <link:label id="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems_7C85E84EBFDC3ECE376212E4E6A12B6E_label_en-US" xlink:label="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems_7C85E84EBFDC3ECE376212E4E6A12B6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]</link:label>
    <link:label id="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems_7C85E84EBFDC3ECE376212E4E6A12B6E_documentation_en-US" xlink:label="lab_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems_7C85E84EBFDC3ECE376212E4E6A12B6E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems" xlink:label="loc_luv_ScheduleOfFairValuesOfFuelDerivativesAmountsPostedAsCollateralAndCollateralPostingThresholdsLineItems_7C85E84EBFDC3ECE376212E4E6A12B6E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_CD2AE63DE924502880A112E4E6A1BD00_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_CD2AE63DE924502880A112E4E6A1BD00" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Amount Not Offset Against Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_CD2AE63DE924502880A112E4E6A1BD00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_CD2AE63DE924502880A112E4E6A1BD00" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_CD2AE63DE924502880A112E4E6A1BD00" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_692B614FF165147346C412E4E6A1B0C5_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_692B614FF165147346C412E4E6A1B0C5" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Amount Not Offset Against Collateral</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_692B614FF165147346C412E4E6A1B0C5_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_692B614FF165147346C412E4E6A1B0C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Amount Not Offset Against Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_692B614FF165147346C412E4E6A1B0C5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_692B614FF165147346C412E4E6A1B0C5" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_692B614FF165147346C412E4E6A1B0C5" xlink:type="arc" />
    <link:label id="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_0C894D8CED641503440312E4E6A1B20F_verboseLabel_en-US" xlink:label="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_0C894D8CED641503440312E4E6A1B20F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash collateral held from (by) CP</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CollateralAlreadyPostedAggregateFairValue" xlink:label="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_0C894D8CED641503440312E4E6A1B20F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_0C894D8CED641503440312E4E6A1B20F" xlink:to="lab_us-gaap_CollateralAlreadyPostedAggregateFairValue_0C894D8CED641503440312E4E6A1B20F" xlink:type="arc" />
    <link:label id="lab_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13_terseLabel_en-US" xlink:label="lab_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aircraft collateral pledged to CP</link:label>
    <link:label id="lab_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13_label_en-US" xlink:label="lab_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Aircraft Collateral Pledged Aggregate Fair Value</link:label>
    <link:label id="lab_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13_documentation_en-US" xlink:label="lab_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The aggregate fair value of assets (aircraft) pledged, at the end of the reporting period, as collateral for outstanding derivative instruments with credit-risk-related contingent features.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_AircraftCollateralPledgedAggregateFairValue" xlink:label="loc_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13" xlink:to="lab_luv_AircraftCollateralPledgedAggregateFairValue_F9EAE7228819858E126C12E4E6A19A13" xlink:type="arc" />
    <link:label id="lab_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E_terseLabel_en-US" xlink:label="lab_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit (LC)</link:label>
    <link:label id="lab_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E_label_en-US" xlink:label="lab_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Collateral Pledged Aggregate Fair Value</link:label>
    <link:label id="lab_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E_documentation_en-US" xlink:label="lab_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Letters of Credit Collateral Pledged Aggregate Fair Value</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_LettersofCreditCollateralPledgedAggregateFairValue" xlink:label="loc_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E" xlink:to="lab_luv_LettersofCreditCollateralPledgedAggregateFairValue_86FBD6529905B385F48912E4E6A1357E" xlink:type="arc" />
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B_terseLabel_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Option to substitute LC for aircraft</link:label>
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B_label_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Of Fuel Derivative Levels In Which Letters Of Credit May Be Substituted For Aircraft</link:label>
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B_documentation_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value Of Fuel Derivative Levels In Which Letters Of Credit May Be Substituted For Aircraft</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft" xlink:label="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B" xlink:to="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft_309166C351BBE97DC7C212E4E6A15D9B" xlink:type="arc" />
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_73E9820E48B89951528912E4E6A1C575_verboseLabel_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_73E9820E48B89951528912E4E6A1C575" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Of Fuel Derivative Levels In Which Letters Of Credit May Be Substituted For Cash Threshold 1</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1" xlink:label="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_73E9820E48B89951528912E4E6A1C575" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_73E9820E48B89951528912E4E6A1C575" xlink:to="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1_73E9820E48B89951528912E4E6A1C575" xlink:type="arc" />
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428_terseLabel_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Option to substitute LC for cash Threshold 2</link:label>
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428_label_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Of Fuel Derivative Levels In Which Letters Of Credit May Be Substituted For Cash Threshold 2</link:label>
    <link:label id="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428_documentation_en-US" xlink:label="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair Value Of Fuel Derivative Levels In Which Letters Of Credit May Be Substituted For Cash Threshold 2</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2" xlink:label="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428" xlink:to="lab_luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2_82F72D2B761F3F33B85812E4E6A10428" xlink:type="arc" />
    <link:label id="lab_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B_terseLabel_en-US" xlink:label="lab_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">If credit rating is investment grade, fair value of fuel derivative level at which:</link:label>
    <link:label id="lab_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B_label_en-US" xlink:label="lab_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Grade Credit Rating [Abstract]</link:label>
    <link:label id="lab_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B_documentation_en-US" xlink:label="lab_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_InvestmentGradeCreditRatingAbstract" xlink:label="loc_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B" xlink:to="lab_luv_InvestmentGradeCreditRatingAbstract_5AF7B062FA66297C98A912E4E6A1B41B" xlink:type="arc" />
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48_terseLabel_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of fuel derivative levels at which cash is provided to CP Threshold 1</link:label>
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48_label_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Grade Rating Fair Value Of Fuel Derivative Levels In Which Cash Is Provided Threshold 1</link:label>
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48_documentation_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment Grade Rating Fair Value Of Fuel Derivative Levels In Which Cash Is Provided Threshold 1</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1" xlink:label="loc_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48" xlink:to="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1_452F01AB269A5128AB2712E4E6A1AD48" xlink:type="arc" />
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5_terseLabel_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of fuel derivative levels at which cash is provided to CP Threshold 2</link:label>
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5_label_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Grade Rating Fair Value Of Fuel Derivative Levels In Which Cash Is Provided Threshold 2</link:label>
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5_documentation_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment Grade Rating Fair Value Of Fuel Derivative Levels In Which Cash Is Provided Threshold 2</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2" xlink:label="loc_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5" xlink:to="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2_C2A89F6F35F35553EAEB12E4E6A135D5" xlink:type="arc" />
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived_0259ADDC9BFC4B55E8E412E4E6A1E926_terseLabel_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived_0259ADDC9BFC4B55E8E412E4E6A1E926" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of fuel derivative level at which cash is received from CP</link:label>
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived_0259ADDC9BFC4B55E8E412E4E6A1E926_label_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived_0259ADDC9BFC4B55E8E412E4E6A1E926" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Grade Rating Fair Value Of Fuel Derivative Level In Which Cash Is Received</link:label>
    <link:label id="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived_0259ADDC9BFC4B55E8E412E4E6A1E926_documentation_en-US" xlink:label="lab_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived_0259ADDC9BFC4B55E8E412E4E6A1E926" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment Grade Rating Fair Value Of Fuel Derivative Level In Which Cash Is Received</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived" xlink:label="loc_luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived_0259ADDC9BFC4B55E8E412E4E6A1E926" xlink:type="locator" />
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    <link:label id="lab_luv_ValuationTechniquesForFairValueMeasurementsDomain_784952D9A41AB21CB25653F4134FA270_label_en-US" xlink:label="lab_luv_ValuationTechniquesForFairValueMeasurementsDomain_784952D9A41AB21CB25653F4134FA270" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Valuation Techniques For Fair Value Measurements [Domain]</link:label>
    <link:label id="lab_luv_ValuationTechniquesForFairValueMeasurementsDomain_784952D9A41AB21CB25653F4134FA270_documentation_en-US" xlink:label="lab_luv_ValuationTechniquesForFairValueMeasurementsDomain_784952D9A41AB21CB25653F4134FA270" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Valuation technique for Level 3 fair value measurements</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_ValuationTechniquesForFairValueMeasurementsDomain" xlink:label="loc_luv_ValuationTechniquesForFairValueMeasurementsDomain_784952D9A41AB21CB25653F4134FA270" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_ValuationTechniquesForFairValueMeasurementsDomain_784952D9A41AB21CB25653F4134FA270" xlink:to="lab_luv_ValuationTechniquesForFairValueMeasurementsDomain_784952D9A41AB21CB25653F4134FA270" xlink:type="arc" />
    <link:label id="lab_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF_terseLabel_en-US" xlink:label="lab_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discounted Cash Flow</link:label>
    <link:label id="lab_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF_label_en-US" xlink:label="lab_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Discounted Cash Flow [Member]</link:label>
    <link:label id="lab_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF_documentation_en-US" xlink:label="lab_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Valuation technique for Level 3 fair value measurements</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_DiscountedCashFlowMember" xlink:label="loc_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF" xlink:to="lab_luv_DiscountedCashFlowMember_7B1960A0FBBA35B7C9F953F4134FD9DF" xlink:type="arc" />
    <link:label id="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7_terseLabel_en-US" xlink:label="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Axis]</link:label>
    <link:label id="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7_label_en-US" xlink:label="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Axis]</link:label>
    <link:label id="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7_documentation_en-US" xlink:label="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents a number of concepts which are required or determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (Level 3).</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis" xlink:label="loc_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7" xlink:to="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis_973D5A162B2EBE86D26B53F4135095E7" xlink:type="arc" />
    <link:label id="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240_terseLabel_en-US" xlink:label="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Domain]</link:label>
    <link:label id="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240_label_en-US" xlink:label="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Domain]</link:label>
    <link:label id="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240_documentation_en-US" xlink:label="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element provides general categories of investment for which the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain" xlink:label="loc_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240" xlink:to="lab_luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationDomain_23D325C8491CCA64284553F413508240" xlink:type="arc" />
    <link:label id="lab_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D_terseLabel_en-US" xlink:label="lab_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unobservable Input [Axis]</link:label>
    <link:label id="lab_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D_label_en-US" xlink:label="lab_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unobservable Input [Axis]</link:label>
    <link:label id="lab_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D_documentation_en-US" xlink:label="lab_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unobservableinputs for Level 3 fair value measurements</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_UnobservableInputAxis" xlink:label="loc_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D" xlink:to="lab_luv_UnobservableInputAxis_D20572E16D4FDB5B486353F413520F0D" xlink:type="arc" />
    <link:label id="lab_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87_terseLabel_en-US" xlink:label="lab_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unobservable Input [Domain]</link:label>
    <link:label id="lab_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87_label_en-US" xlink:label="lab_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unobservable Input [Domain]</link:label>
    <link:label id="lab_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87_documentation_en-US" xlink:label="lab_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unobservable input for Level 3 fair value measurements</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_UnobservableInputDomain" xlink:label="loc_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87" xlink:to="lab_luv_UnobservableInputDomain_B0979612F97367918E6653F413532A87" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_AF02F26E7B35741AC6E753F413544417_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_AF02F26E7B35741AC6E753F413544417" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 2</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_AF02F26E7B35741AC6E753F413544417" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel2Member_AF02F26E7B35741AC6E753F413544417" xlink:to="lab_us-gaap_FairValueInputsLevel2Member_AF02F26E7B35741AC6E753F413544417" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_F1F71114FABE6ED10CE753F413554AED_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_F1F71114FABE6ED10CE753F413554AED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Level 3</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_F1F71114FABE6ED10CE753F413554AED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel3Member_F1F71114FABE6ED10CE753F413554AED" xlink:to="lab_us-gaap_FairValueInputsLevel3Member_F1F71114FABE6ED10CE753F413554AED" xlink:type="arc" />
    <link:label id="lab_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF_terseLabel_en-US" xlink:label="lab_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan Agreement payable through July 2019 - 4.84%</link:label>
    <link:label id="lab_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF_label_en-US" xlink:label="lab_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan Agreement Due 07 01 2019 [Member]</link:label>
    <link:label id="lab_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF_documentation_en-US" xlink:label="lab_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Collateralized debt obligations with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion. Such obligations are due in 2019. Effective interest rate is 6.64 percent.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_TermLoanAgreementDue07012019Member" xlink:label="loc_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF" xlink:to="lab_luv_TermLoanAgreementDue07012019Member_537BC76AC3DC47A3AB6B53F4135588EF" xlink:type="arc" />
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F_terseLabel_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.75% Notes Due November 2019</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F_label_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2019 [Member] [Member]</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F_documentation_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured, Senior debt obligation due in 2019. Unsecured debt is not collateralized by pledge, mortgage, or other lien in the entity's assets. Senior notes have the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle is longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_UnsecuredSeniorNotesDue2019MemberMember" xlink:label="loc_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F" xlink:to="lab_luv_UnsecuredSeniorNotesDue2019MemberMember_2D8E9A2FFC293732B67653F41356547F" xlink:type="arc" />
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE_terseLabel_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.65% Notes due 2020</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE_label_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2020 [Member]</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE_documentation_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2020 [Member]</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_UnsecuredSeniorNotesDue2020Member" xlink:label="loc_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE" xlink:to="lab_luv_UnsecuredSeniorNotesDue2020Member_DB524943E80CEEF4B3F953F41356F6BE" xlink:type="arc" />
    <link:label id="lab_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016_terseLabel_en-US" xlink:label="lab_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan Agreement payable through 2020 - 5.223%</link:label>
    <link:label id="lab_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016_label_en-US" xlink:label="lab_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan Agreement Due 2020 [Member]</link:label>
    <link:label id="lab_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016_documentation_en-US" xlink:label="lab_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets) with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion. Such obligations are due in 2020.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_TermLoanAgreementDue2020Member" xlink:label="loc_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016" xlink:to="lab_luv_TermLoanAgreementDue2020Member_E961BAB3913D67E5610453F41356A016" xlink:type="arc" />
    <link:label id="lab_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488_terseLabel_en-US" xlink:label="lab_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">737 Aircraft Notes payable through 2020</link:label>
    <link:label id="lab_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488_label_en-US" xlink:label="lab_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes Payable Aircraft Floating Rate Through 2020 [Member]</link:label>
    <link:label id="lab_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488_documentation_en-US" xlink:label="lab_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">A written promise to pay a note to a third party. Such obligations are due through 2020.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_NotesPayableAircraftFloatingRateThrough2020Member" xlink:label="loc_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488" xlink:to="lab_luv_NotesPayableAircraftFloatingRateThrough2020Member_D46F57A7EADB9FE4104253F413570488" xlink:type="arc" />
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1_terseLabel_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2.75% Notes due 2022</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1_label_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2022 [Domain]</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1_documentation_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2022 [Domain]</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_UnsecuredSeniorNotesDue2022Domain" xlink:label="loc_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1" xlink:to="lab_luv_UnsecuredSeniorNotesDue2022Domain_1E62C253D97DFEF18D2E53F4135736A1" xlink:type="arc" />
    <link:label id="lab_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213_terseLabel_en-US" xlink:label="lab_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pass Through Certificates due 2022 - 6.24%</link:label>
    <link:label id="lab_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213_label_en-US" xlink:label="lab_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total Pass Through Certificates [Member]</link:label>
    <link:label id="lab_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213_documentation_en-US" xlink:label="lab_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total of Pass Through Certificates Series A and Series B.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_TotalPassThroughCertificatesMember" xlink:label="loc_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213" xlink:to="lab_luv_TotalPassThroughCertificatesMember_4BC9479A5E68577E286B53F413572213" xlink:type="arc" />
    <link:label id="lab_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43_terseLabel_en-US" xlink:label="lab_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term Loan Agreement due 2026 - 3.71%</link:label>
    <link:label id="lab_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43_label_en-US" xlink:label="lab_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan Agreement Due 2026 [Member]</link:label>
    <link:label id="lab_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43_documentation_en-US" xlink:label="lab_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Term Loan Agreement Due 2026</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_TermLoanAgreementDue2026Member" xlink:label="loc_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43" xlink:to="lab_luv_TermLoanAgreementDue2026Member_D1A2B0FF99A73601506353F413576E43" xlink:type="arc" />
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38_terseLabel_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.00% Notes due 2026</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38_label_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2026 [Member]</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38_documentation_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2026</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_UnsecuredSeniorNotesDue2026Member" xlink:label="loc_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38" xlink:to="lab_luv_UnsecuredSeniorNotesDue2026Member_E0D29B82274FC25367ED53F413589B38" xlink:type="arc" />
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095_terseLabel_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.45% Notes due 2027</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095_label_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes Due 2027 [Member]</link:label>
    <link:label id="lab_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095_documentation_en-US" xlink:label="lab_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured, Senior debt obligation due in 2027. Unsecured debt is not collateralized by pledge, mortgage or other lien in the entity's assets. Senior notes have the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_UnsecuredSeniorNotesDue2027Member" xlink:label="loc_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095" xlink:to="lab_luv_UnsecuredSeniorNotesDue2027Member_61E88E588DD6FF40505D53F41358A095" xlink:type="arc" />
    <link:label id="lab_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA_terseLabel_en-US" xlink:label="lab_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">7.375% Debentures due 2027</link:label>
    <link:label id="lab_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA_label_en-US" xlink:label="lab_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debentures due 2027 [Domain]</link:label>
    <link:label id="lab_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA_documentation_en-US" xlink:label="lab_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debentures due 2027 [Domain]</link:label>
    <link:loc xlink:href="luv-20190930.xsd#luv_Debenturesdue2027Domain" xlink:label="loc_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA" xlink:to="lab_luv_Debenturesdue2027Domain_0B41579ED4DDF155B53C53F4135812EA" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnsecuredDebtMember_88C5B5661D2B7703F14C53F413596968_terseLabel_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember_88C5B5661D2B7703F14C53F413596968" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured Debt</link:label>
    <link:label id="lab_us-gaap_UnsecuredDebtMember_88C5B5661D2B7703F14C53F413596968_label_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember_88C5B5661D2B7703F14C53F413596968" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Debt [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnsecuredDebtMember" xlink:label="loc_us-gaap_UnsecuredDebtMember_88C5B5661D2B7703F14C53F413596968" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnsecuredDebtMember_88C5B5661D2B7703F14C53F413596968" xlink:to="lab_us-gaap_UnsecuredDebtMember_88C5B5661D2B7703F14C53F413596968" xlink:type="arc" />
    <link:label id="lab_us-gaap_EnhancedEquipmentTrustCertificateMember_820895941B6456566AA053F4135944EE_terseLabel_en-US" xlink:label="lab_us-gaap_EnhancedEquipmentTrustCertificateMember_820895941B6456566AA053F4135944EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Enhanced Equipment Trust Certificate</link:label>
    <link:label id="lab_us-gaap_EnhancedEquipmentTrustCertificateMember_820895941B6456566AA053F4135944EE_label_en-US" xlink:label="lab_us-gaap_EnhancedEquipmentTrustCertificateMember_820895941B6456566AA053F4135944EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Enhanced Equipment Trust Certificate [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EnhancedEquipmentTrustCertificateMember" xlink:label="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_820895941B6456566AA053F4135944EE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EnhancedEquipmentTrustCertificateMember_820895941B6456566AA053F4135944EE" xlink:to="lab_us-gaap_EnhancedEquipmentTrustCertificateMember_820895941B6456566AA053F4135944EE" xlink:type="arc" />
    <link:label id="lab_us-gaap_NotesPayableToBanksMember_D1C44B4AB22A2F3FF9F653F4135A7E97_terseLabel_en-US" xlink:label="lab_us-gaap_NotesPayableToBanksMember_D1C44B4AB22A2F3FF9F653F4135A7E97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes Payable to Banks</link:label>
    <link:label id="lab_us-gaap_NotesPayableToBanksMember_D1C44B4AB22A2F3FF9F653F4135A7E97_label_en-US" xlink:label="lab_us-gaap_NotesPayableToBanksMember_D1C44B4AB22A2F3FF9F653F4135A7E97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes Payable to Banks [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NotesPayableToBanksMember" xlink:label="loc_us-gaap_NotesPayableToBanksMember_D1C44B4AB22A2F3FF9F653F4135A7E97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NotesPayableToBanksMember_D1C44B4AB22A2F3FF9F653F4135A7E97" xlink:to="lab_us-gaap_NotesPayableToBanksMember_D1C44B4AB22A2F3FF9F653F4135A7E97" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansPayableFairValueDisclosure_74A9D3EA7AF71B276BBB53F4135AEB76_terseLabel_en-US" xlink:label="lab_us-gaap_LoansPayableFairValueDisclosure_74A9D3EA7AF71B276BBB53F4135AEB76" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans Payable, Fair Value</link:label>
    <link:label id="lab_us-gaap_LoansPayableFairValueDisclosure_74A9D3EA7AF71B276BBB53F4135AEB76_label_en-US" xlink:label="lab_us-gaap_LoansPayableFairValueDisclosure_74A9D3EA7AF71B276BBB53F4135AEB76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Payable, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoansPayableFairValueDisclosure" xlink:label="loc_us-gaap_LoansPayableFairValueDisclosure_74A9D3EA7AF71B276BBB53F4135AEB76" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansPayableFairValueDisclosure_74A9D3EA7AF71B276BBB53F4135AEB76" xlink:to="lab_us-gaap_LoansPayableFairValueDisclosure_74A9D3EA7AF71B276BBB53F4135AEB76" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_421103CBD2AD3C8139C653F4135B1ED7_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_421103CBD2AD3C8139C653F4135B1ED7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Carrying amount of debt</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_421103CBD2AD3C8139C653F4135B1ED7_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_421103CBD2AD3C8139C653F4135B1ED7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_421103CBD2AD3C8139C653F4135B1ED7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentCarryingAmount_421103CBD2AD3C8139C653F4135B1ED7" xlink:to="lab_us-gaap_DebtInstrumentCarryingAmount_421103CBD2AD3C8139C653F4135B1ED7" xlink:type="arc" />
    <link:label id="lab_us-gaap_NotesPayableFairValueDisclosure_534EB78169440872E29A53F4135B8D16_terseLabel_en-US" xlink:label="lab_us-gaap_NotesPayableFairValueDisclosure_534EB78169440872E29A53F4135B8D16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notes Payable, Fair Value</link:label>
    <link:label id="lab_us-gaap_NotesPayableFairValueDisclosure_534EB78169440872E29A53F4135B8D16_label_en-US" xlink:label="lab_us-gaap_NotesPayableFairValueDisclosure_534EB78169440872E29A53F4135B8D16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Notes Payable, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NotesPayableFairValueDisclosure" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_534EB78169440872E29A53F4135B8D16" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NotesPayableFairValueDisclosure_534EB78169440872E29A53F4135B8D16" xlink:to="lab_us-gaap_NotesPayableFairValueDisclosure_534EB78169440872E29A53F4135B8D16" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_CC6BA41690F91F8A604C53F4151E1BBC_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_CC6BA41690F91F8A604C53F4151E1BBC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_CC6BA41690F91F8A604C53F4151E1BBC_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_CC6BA41690F91F8A604C53F4151E1BBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instruments, Gain (Loss) [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_CC6BA41690F91F8A604C53F4151E1BBC" xlink:type="locator" />
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