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Cover
Jun. 03, 2021
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Jun. 03, 2021
Entity Registrant Name SOUTHWEST AIRLINES CO.
Entity Incorporation, State or Country Code TX
Entity File Number 1-7259
Entity Tax Identification Number 74-1563240
Entity Address, Address Line One P.O. Box 36611
Entity Address, City or Town Dallas,
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75235-1611
City Area Code 214
Local Phone Number 792-4000
Pre-commencement Issuer Tender Offer false
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000092380
Amendment Flag false
NEW YORK STOCK EXCHANGE, INC.  
Document Information [Line Items]  
Title of 12(b) Security Common Stock ($1.00 par value)
Trading Symbol LUV
Security Exchange Name NYSE