Airlines › Southwest Airlines › September 2025
Carrier month · September 2025
Southwest Airlines in September 2025
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In September 2025, Southwest Airlines (WN) reported 110,361 scheduled domestic flights. 82.6% arrived on time, 0.2% were cancelled and 0.2% diverted.
All reporting carriers together recorded 82.8% on time and 0.5% cancelled that month, so the carrier was level with the combined figure.
A year earlier, in September 2024, it reported 112,561 flights with 85.0% on time: a change of −2.4 points.
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 48%, air carrier 27% and national aviation system 22%.
- On time 82.6%
- Arrived 15+ minutes late 17.0%
- Cancelled 0.2%
- Diverted 0.2%
September 2025 against a year earlier, the carrier's year and all carriers
| Measure | Sep 2025 | Sep 2024 | WN, 12 months to Jul 2026 | All carriers, Sep 2025 |
|---|---|---|---|---|
| Arrived on time | 82.6% | 85.0% | 75.5% | 82.8% |
| Departed on time | 79.6% | 82.8% | 71.2% | 83.1% |
| Cancelled | 0.2% | 0.4% | 0.9% | 0.5% |
| Average arrival delay | 2.6 min | -0.3 min | 6.8 min | 2.3 min |
| Scheduled flights a day | 3,679 | 3,752 | 3,808 | 18,748 |
| Scheduled flights | 110,361 | 112,561 | 1,389,951 | 562,439 |
104 airports and 1,599 routes had WN flights that month.
Busiest airports that month
| Airport | Departures | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|
| DEN Denver | 7,301 | 72.4% | 10.5 min | 0.1% |
| LAS Las Vegas | 6,794 | 76.1% | 6.4 min | 0.5% |
| MDW Chicago | 6,007 | 83.5% | 1.6 min | 0.1% |
| BWI Baltimore | 5,998 | 85.2% | 0.5 min | 0.1% |
| DAL Dallas | 5,356 | 81.5% | 3.7 min | 0.1% |
| PHX Phoenix | 4,986 | 80.2% | 6.3 min | 1.0% |
| BNA Nashville | 4,731 | 86.6% | -1.9 min | 0.0% |
| HOU Houston | 4,136 | 86.0% | 0.6 min | 0.1% |
| STL St. Louis | 3,361 | 82.5% | 2.8 min | 0.1% |
| MCO Orlando | 3,278 | 84.1% | 0.9 min | 0.1% |
| AUS Austin | 2,862 | 83.0% | 1.7 min | 0.1% |
| SAN San Diego | 2,856 | 77.1% | 6.1 min | 1.1% |
| SMF Sacramento | 2,672 | 83.6% | 2.5 min | 0.3% |
| OAK Oakland | 2,420 | 80.9% | 3.5 min | 0.3% |
| SJC San Jose | 2,259 | 82.3% | 2.1 min | 0.6% |
By scheduled departure hour
Delay causes
Questions and answers
What share of Southwest Airlines flights were on time in September 2025?
82.6% of 110,361 scheduled domestic flights arrived less than 15 minutes late; all reporting carriers together recorded 82.8% that month.
How does that compare with a year earlier?
In September 2024 the carrier reported 112,561 flights with 85.0% on time and 0.4% cancelled, against 82.6% and 0.2% in September 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; public domain. Domestic scheduled flights, totals and averages only. The site's data runs through July 2026. Full record for Southwest Airlines · methodology · corrections.