Flight Check

Best Airline: PDX to DEN

Portland to Denver — airline reliability comparison

United Airlines is the most reliable airline on the PDX to DEN route with a 89% on-time rate, compared to Frontier Airlines at 77%. Based on 6,632 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 Airlines89%
Alaska Airlines82%
Southwest Airlines79%
Frontier Airlines77%

PDX to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest89%0.9%74m6,632
Alaska AirlinesAS82%1.4%48m1,709
Southwest AirlinesWN79%0.7%49m5,895
Frontier AirlinesF9Worst77%1.3%64m1,497

Route Overview

83%
Overall On-Time
59m
Avg Delay
0.8%
Cancel Rate
15,759
Total Flights
PDX to DEN Route DetailsReturn: DEN to PDX
PDX AirportDEN Airport

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