Flight Check

Best Airline: DEN to DCA

Denver to Washington — airline reliability comparison

United Airlines is the most reliable airline on the DEN to DCA route with a 83% on-time rate, compared to Frontier Airlines at 78%. Based on 1,306 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 Airlines83%
Frontier Airlines78%

DEN to DCA Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest83%0.5%64m1,306
Frontier AirlinesF9Worst78%1.3%67m3,785

Route Overview

79%
Overall On-Time
67m
Avg Delay
1.1%
Cancel Rate
5,091
Total Flights
DEN to DCA Route DetailsReturn: DCA to DEN
DEN AirportDCA Airport

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