Flight Check

Best Airline: BOS to STL

Boston to St. Louis — airline reliability comparison

Republic Airways is the most reliable airline on the BOS to STL route with a 87% on-time rate, compared to Southwest Airlines at 77%. Based on 772 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%
83%
Southwest Airlines77%

BOS to STL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Republic AirwaysYXBest87%3.1%41m772
MQ83%1.7%76m1,527
Southwest AirlinesWNWorst77%1.0%56m3,217

Route Overview

80%
Overall On-Time
60m
Avg Delay
1.4%
Cancel Rate
5,551
Total Flights
BOS to STL Route DetailsReturn: STL to BOS
BOS AirportSTL Airport

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