Southwest Airlines PHL to STL on-time performance
Southwest Airlines nonstop flights from Philadelphia to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
79%
arrived < 15 min late
Cancelled
0.6%
4 flights
Avg arrival delay
17 min
74 min when late
Rank on route
#2 of 4
route average 78% on time
Key facts
- Southwest Airlines flights on PHL to STL arrived on time 79% of the time in Aug 2025 – Jul 2026.
- 0.6% were cancelled, and 7% arrived an hour or more late.
- That ranks #2 of 4 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was late-arriving aircraft (54%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft54%
- Airline (crew, maintenance, cleaning, fueling)27%
- Air traffic control & airport congestion18%
- Extreme weather2%
- Security0%
Other airlines on PHL to STL
- American Airlines76% on time · 19 min avg delay
- PSA Airlines76% on time · 17 min avg delay
- Republic Airways85% on time · 11 min avg delay
Full PHL to STL comparison →
Southwest Airlines on-time record across all routes →
726 Southwest Airlines flights tracked on this route; 4 cancelled, 1 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.