Flight Check

Best Airline: CLE to DEN

Cleveland to Denver — airline reliability comparison

United Airlines is the most reliable airline on the CLE to DEN route with a 88% on-time rate, compared to Frontier Airlines at 68%. Based on 3,513 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 Airlines88%
Southwest Airlines82%
Frontier Airlines68%

CLE to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest88%0.3%65m3,513
Southwest AirlinesWN82%0.3%53m2,033
Frontier AirlinesF9Worst68%1.6%82m983

Route Overview

83%
Overall On-Time
70m
Avg Delay
0.5%
Cancel Rate
6,545
Total Flights
CLE to DEN Route DetailsReturn: DEN to CLE
CLE AirportDEN Airport

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