Flight Check

Best Airline: DCA to DEN

Washington to Denver — airline reliability comparison

Frontier Airlines is the most reliable airline on the DCA to DEN route with a 81% on-time rate, compared to United Airlines at 76%. Based on 3,782 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

Frontier Airlines81%
United Airlines76%

DCA to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Frontier AirlinesF9Best81%1.4%84m3,782
United AirlinesUAWorst76%0.5%109m1,307

Route Overview

80%
Overall On-Time
91m
Avg Delay
1.2%
Cancel Rate
5,089
Total Flights
DCA to DEN Route DetailsReturn: DEN to DCA
DCA AirportDEN Airport

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