Flight Check

Best Airline: STL to ORD

St. Louis to Chicago — airline reliability comparison

Republic Airways is the most reliable airline on the STL to ORD route with a 84% on-time rate, compared to United Airlines at 69%. Based on 1,469 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 Airways84%
American Airlines81%
79%
SkyWest Airlines71%
United Airlines69%

STL to ORD Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Republic AirwaysYXBest84%3.0%64m1,469
American AirlinesAA81%1.5%125m1,938
MQ79%1.9%76m2,607
SkyWest AirlinesOO71%3.0%92m1,596
United AirlinesUAWorst69%1.0%76m1,834

Route Overview

76%
Overall On-Time
89m
Avg Delay
2%
Cancel Rate
9,538
Total Flights
STL to ORD Route DetailsReturn: ORD to STL
STL AirportORD Airport

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