Flight Check

Best Airline: STL to SFO

St. Louis to San Francisco — airline reliability comparison

United Airlines is the most reliable airline on the STL to SFO route with a 74% on-time rate, compared to Southwest Airlines at 62%. Based on 610 flights tracked.

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

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

United Airlines74%
SkyWest Airlines68%
Southwest Airlines62%

STL to SFO Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest74%0.4%93m610
SkyWest AirlinesOO68%1.5%93m267
Southwest AirlinesWNWorst62%0.1%58m848

Route Overview

67%
Overall On-Time
71m
Avg Delay
0.5%
Cancel Rate
1,742
Total Flights
STL to SFO Route DetailsReturn: SFO to STL
STL AirportSFO Airport

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