is the most reliable airline on the PHX to STL route with a 92% on-time rate, compared to Frontier Airlines at 69%. Based on 49 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: PHX to STL
Phoenix to St. Louis — airline reliability comparison
On-Time Rate by Airline
92%
SkyWest Airlines87%
Southwest Airlines81%
American Airlines78%
Frontier Airlines69%
PHX to STL Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| MQBest | 92% | 0.0% | 49m | 49 |
| SkyWest AirlinesOO | 87% | 0.0% | 40m | 209 |
| Southwest AirlinesWN | 81% | 0.4% | 48m | 5,334 |
| American AirlinesAA | 78% | 0.4% | 70m | 2,202 |
| Frontier AirlinesF9Worst | 69% | 0.0% | 79m | 64 |
Route Overview
80%
Overall On-Time
55m
Avg Delay
0.4%
Cancel Rate
7,945
Total Flights
Flying out of PHX? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.