MARKETING CARRIER REPORT
WN
Southwest Airlines historical flight reliability
Across 1,390,634 scheduled domestic flights marketed by Southwest Airlines, 75.7% arrived on time, 14.0% arrived at least 30 minutes late, and 0.9% were cancelled during July 2025–June 2026.
Source: U.S. Bureau of Transportation Statistics · National marketing-carrier cohort · Updated September 16, 2026
HISTORICAL ROUTE SIGNALGenerally reliable
75.7%arrived on time
14.0%30+ min late
0.9%cancelled
1,390,634scheduled flights
LARGEST QUALIFYING SAMPLES
SEARCH ROUTES →Which Southwest Airlines published route was most reliable?
Among qualifying Southwest Airlines published route results, SJC to LAS had the highest on-time rate: 79.2% of 3,241 flights. LAS to SAN was lowest at 61.8% across 3,738 flights.
DAL→HOUDallas, TX (DAL) to Houston, TX (HOU)4,063 flights analyzedGenerally reliable72.7%on timeHOU→DALHouston, TX (HOU) to Dallas, TX (DAL)4,060 flights analyzedGenerally reliable79.0%on timeDEN→PHXDenver, CO (DEN) to Phoenix, AZ (PHX)3,950 flights analyzedGenerally reliable71.1%on timePHX→DENPhoenix, AZ (PHX) to Denver, CO (DEN)3,942 flights analyzedGenerally reliable72.0%on timeSMF→SANSacramento, CA (SMF) to San Diego, CA (SAN)3,810 flights analyzedGenerally reliable70.4%on timeSAN→SMFSan Diego, CA (SAN) to Sacramento, CA (SMF)3,807 flights analyzedGenerally reliable75.0%on timeSAN→SJCSan Diego, CA (SAN) to San Jose, CA (SJC)3,741 flights analyzedGenerally reliable75.3%on timeSJC→SANSan Jose, CA (SJC) to San Diego, CA (SAN)3,740 flights analyzedVariable69.9%on timeLAS→SANLas Vegas, NV (LAS) to San Diego, CA (SAN)3,738 flights analyzedVariable61.8%on timeSAN→LASSan Diego, CA (SAN) to Las Vegas, NV (LAS)3,730 flights analyzedGenerally reliable73.7%on timeMCO→BWIOrlando, FL (MCO) to Baltimore, MD (BWI)3,584 flights analyzedGenerally reliable75.2%on timeBWI→MCOBaltimore, MD (BWI) to Orlando, FL (MCO)3,581 flights analyzedGenerally reliable75.1%on timePHX→LASPhoenix, AZ (PHX) to Las Vegas, NV (LAS)3,447 flights analyzedGenerally reliable76.5%on timeLAS→PHXLas Vegas, NV (LAS) to Phoenix, AZ (PHX)3,446 flights analyzedGenerally reliable75.5%on timeSMF→LASSacramento, CA (SMF) to Las Vegas, NV (LAS)3,432 flights analyzedGenerally reliable78.4%on timeLAS→SMFLas Vegas, NV (LAS) to Sacramento, CA (SMF)3,432 flights analyzedGenerally reliable76.7%on timeLAS→SJCLas Vegas, NV (LAS) to San Jose, CA (SJC)3,255 flights analyzedGenerally reliable77.6%on timeSJC→LASSan Jose, CA (SJC) to Las Vegas, NV (LAS)3,241 flights analyzedGenerally reliable79.2%on time
Network averages hide route mix.
An airline's national result reflects where and when it flies. A route-specific comparison is usually more useful for a booking decision.