Flight Check

Best Airline: DEN to SFO

Denver to San Francisco — airline reliability comparison

United Airlines is the most reliable airline on the DEN to SFO route with a 74% on-time rate, compared to Southwest Airlines at 57%. Based on 11,902 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

United Airlines74%
Frontier Airlines68%
Southwest Airlines57%

DEN to SFO Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest74%0.8%67m11,902
Frontier AirlinesF968%0.9%63m2,372
Southwest AirlinesWNWorst57%0.8%58m5,363

Route Overview

69%
Overall On-Time
63m
Avg Delay
0.8%
Cancel Rate
19,637
Total Flights
DEN to SFO Route DetailsReturn: SFO to DEN
DEN AirportSFO Airport

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