Flight Check

Best Airline: ORD to STL

Chicago to St. Louis — airline reliability comparison

Republic Airways is the most reliable airline on the ORD to STL route with a 85% on-time rate, compared to American Airlines at 68%. Based on 1,270 flights tracked.

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

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

Republic Airways85%
United Airlines81%
80%
SkyWest Airlines74%
American Airlines68%

ORD to STL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Republic AirwaysYXBest85%2.4%46m1,270
United AirlinesUA81%0.9%70m1,836
MQ80%1.7%51m2,596
SkyWest AirlinesOO74%2.1%71m1,598
American AirlinesAAWorst68%1.8%85m1,944

Route Overview

77%
Overall On-Time
71m
Avg Delay
1.7%
Cancel Rate
9,340
Total Flights
ORD to STL Route DetailsReturn: STL to ORD
ORD AirportSTL Airport

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