Flight Check

Best Airline: IAH to DEN

Houston to Denver — airline reliability comparison

United Airlines is the most reliable airline on the IAH to DEN route with a 79% on-time rate, compared to Spirit Airlines at 62%. Based on 13,488 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 Airlines79%
Southwest Airlines79%
Frontier Airlines69%
Spirit Airlines62%

IAH to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest79%0.9%69m13,488
Southwest AirlinesWN79%1.4%59m1,586
Frontier AirlinesF969%1.9%90m2,260
Spirit AirlinesNKWorst62%1.9%68m103

Route Overview

78%
Overall On-Time
71m
Avg Delay
1.1%
Cancel Rate
17,451
Total Flights
IAH to DEN Route DetailsReturn: DEN to IAH
IAH AirportDEN Airport

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