Flight Check

Best Airline: STL to BOS

St. Louis to Boston — airline reliability comparison

Republic Airways is the most reliable airline on the STL to BOS route with a 84% on-time rate, compared to Southwest Airlines at 74%. Based on 773 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 Airways84%
75%
Southwest Airlines74%

STL to BOS Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Republic AirwaysYXBest84%2.8%67m773
MQ75%2.0%74m1,519
Southwest AirlinesWNWorst74%1.0%54m3,201

Route Overview

75%
Overall On-Time
60m
Avg Delay
1.4%
Cancel Rate
5,537
Total Flights
STL to BOS Route DetailsReturn: BOS to STL
STL AirportBOS Airport

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