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Document and Entity Information
Nov. 03, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Nov. 03, 2025
Entity Registrant Name SOUTHWEST AIRLINES CO.
Entity Incorporation State Country Code TX
Entity File Number 1-7259
Entity Tax Identification Number 74-1563240
Entity Address Address Line 1 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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock ($1.00 par value)
Trading Symbol LUV
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000092380