Flight Check

Best Airline: SAN to DEN

San Diego to Denver — airline reliability comparison

United Airlines is the most reliable airline on the SAN to DEN route with a 85% on-time rate, compared to SkyWest Airlines at 74%. Based on 7,599 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 Airlines85%
Alaska Airlines84%
Frontier Airlines77%
Southwest Airlines76%
SkyWest Airlines74%

SAN to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest85%1.1%70m7,599
Alaska AirlinesAS84%0.8%52m495
Frontier AirlinesF977%1.4%75m2,971
Southwest AirlinesWN76%1.0%57m8,624
SkyWest AirlinesOOWorst74%2.0%46m373

Route Overview

80%
Overall On-Time
63m
Avg Delay
1.1%
Cancel Rate
20,066
Total Flights
SAN to DEN Route DetailsReturn: DEN to SAN
SAN AirportDEN Airport

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