is the most reliable airline on the STL to PHX route with a 90% on-time rate, compared to Frontier Airlines at 70%. Based on 48 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: STL to PHX
St. Louis to Phoenix — airline reliability comparison
On-Time Rate by Airline
90%
American Airlines82%
SkyWest Airlines80%
Southwest Airlines77%
Frontier Airlines70%
STL to PHX Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| MQBest | 90% | 0.0% | 33m | 48 |
| American AirlinesAA | 82% | 0.6% | 161m | 2,205 |
| SkyWest AirlinesOO | 80% | 0.0% | 80m | 208 |
| Southwest AirlinesWN | 77% | 0.5% | 50m | 5,263 |
| Frontier AirlinesF9Worst | 70% | 0.0% | 88m | 63 |
Route Overview
79%
Overall On-Time
74m
Avg Delay
0.5%
Cancel Rate
7,873
Total Flights
Flying out of STL? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.