Flight Check

Best Airline: PHL to STL

Philadelphia to St. Louis — airline reliability comparison

Republic Airways is the most reliable airline on the PHL to STL route with a 87% on-time rate, compared to Frontier Airlines at 54%. Based on 323 flights tracked.

This route involves weather-prone airports, which can affect reliability regardless of airline.

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

Republic Airways87%
Southwest Airlines82%
PSA Airlines79%
American Airlines74%
Frontier Airlines54%

PHL to STL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Republic AirwaysYXBest87%0.9%47m323
Southwest AirlinesWN82%0.7%63m2,423
PSA AirlinesOH79%5.5%73m395
American AirlinesAA74%1.5%77m1,958
Frontier AirlinesF9Worst54%17.1%66m29

Route Overview

78%
Overall On-Time
72m
Avg Delay
1.6%
Cancel Rate
5,214
Total Flights
PHL to STL Route DetailsReturn: STL to PHL
PHL AirportSTL Airport

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Data last updated October 2026. Source: Bureau of Transportation Statistics.