Flight Check

Best Airline: DEN to IAH

Denver to Houston — airline reliability comparison

United Airlines is the most reliable airline on the DEN to IAH route with a 77% on-time rate, compared to Spirit Airlines at 66%. Based on 13,493 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 Airlines77%
Southwest Airlines74%
Frontier Airlines73%
Spirit Airlines66%

DEN to IAH Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest77%0.8%66m13,493
Southwest AirlinesWN74%1.5%54m1,602
Frontier AirlinesF973%0.8%67m2,262
Spirit AirlinesNKWorst66%1.1%86m104

Route Overview

76%
Overall On-Time
65m
Avg Delay
0.9%
Cancel Rate
17,473
Total Flights
DEN to IAH Route DetailsReturn: IAH to DEN
DEN AirportIAH Airport

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