Flight Check

Best Airline: SFO to DEN

San Francisco to Denver — airline reliability comparison

United Airlines is the most reliable airline on the SFO to DEN route with a 82% on-time rate, compared to Southwest Airlines at 68%. Based on 11,904 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 Airlines82%
Frontier Airlines71%
Southwest Airlines68%

SFO to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest82%0.6%64m11,904
Frontier AirlinesF971%1.3%84m2,373
Southwest AirlinesWNWorst68%0.8%57m5,373

Route Overview

77%
Overall On-Time
64m
Avg Delay
0.7%
Cancel Rate
19,650
Total Flights
SFO to DEN Route DetailsReturn: DEN to SFO
SFO AirportDEN Airport

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