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STOCK PLANS - Employee Stock Purchase Plan Activity (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |  |  |
Total number of shares purchased (in shares) | 2,227 | 1,972 | 1,453
Average price paid per share (in USD per share) | $ 26.38 | $ 27.46 | $ 36.10
Weighted-average fair value of each purchase right under the ESPP (in USD per share) | $ 2.93 | $ 3.05 | $ 4.02

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- Definition This element represents the value of the discount applied to the market value for shares available to participating employees under the employee stock purchase plan. + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the weighted average fair value of each purchase right under the employee stock purchase plan. + References No definition available. + Details
Name: | luv_WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan
Namespace Prefix: | luv_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
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Balance Type: | na
Period Type: | duration