Southwest Airlines STL to PHL on-time performance
Southwest Airlines nonstop flights from St. Louis to Philadelphia · Aug 2025 – Jul 2026
On-time arrivals
75%
arrived < 15 min late
Cancelled
0.4%
3 flights
Avg arrival delay
16 min
58 min when late
Rank on route
#4 of 4
route average 80% on time
Key facts
- Southwest Airlines flights on STL to PHL arrived on time 75% of the time in Aug 2025 – Jul 2026.
- 0.4% were cancelled, and 8% arrived an hour or more late.
- That ranks #4 of 4 airlines on this route, which averaged 80% on time overall.
- The largest source of delay minutes was late-arriving aircraft (56%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft56%
- Airline (crew, maintenance, cleaning, fueling)26%
- Air traffic control & airport congestion16%
- Extreme weather3%
- Security0%
Other airlines on STL to PHL
- American Airlines84% on time · 22 min avg delay
- PSA Airlines85% on time · 13 min avg delay
- Republic Airways85% on time · 17 min avg delay
Full STL to PHL comparison →
Southwest Airlines on-time record across all routes →
725 Southwest Airlines flights tracked on this route; 3 cancelled, 3 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.