Southwest Airlines STL to PHX on-time performance
Southwest Airlines nonstop flights from St. Louis to Phoenix · Aug 2025 – Jul 2026
On-time arrivals
71%
arrived < 15 min late
Cancelled
0.3%
5 flights
Avg arrival delay
16 min
50 min when late
Rank on route
#5 of 5
route average 75% on time
Key facts
- Southwest Airlines flights on STL to PHX arrived on time 71% of the time in Aug 2025 – Jul 2026.
- 0.3% were cancelled, and 8% arrived an hour or more late.
- That ranks #5 of 5 airlines on this route, which averaged 75% on time overall.
- The largest source of delay minutes was late-arriving aircraft (57%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft57%
- Airline (crew, maintenance, cleaning, fueling)27%
- Air traffic control & airport congestion14%
- Extreme weather2%
- Security0%
Other airlines on STL to PHX
- American Airlines81% on time · 36 min avg delay
- Frontier Airlines83% on time · 37 min avg delay
- Envoy Air100% on time · 2 min avg delay
- SkyWest Airlines96% on time · 8 min avg delay
Full STL to PHX comparison →
Southwest Airlines on-time record across all routes →
1,619 Southwest Airlines flights tracked on this route; 5 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.