Flight Check

Best Airline: ORD to DEN

Chicago to Denver — airline reliability comparison

United Airlines is the most reliable airline on the ORD to DEN route with a 80% on-time rate, compared to Frontier Airlines at 68%. Based on 12,790 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 Airlines80%
Southwest Airlines77%
76%
American Airlines71%
Frontier Airlines68%

ORD to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest80%1.0%70m12,790
Southwest AirlinesWN77%1.7%61m4,586
MQ76%0.0%43m108
American AirlinesAA71%1.1%73m4,213
Frontier AirlinesF9Worst68%2.1%126m831

Route Overview

77%
Overall On-Time
72m
Avg Delay
1.2%
Cancel Rate
22,562
Total Flights
ORD to DEN Route DetailsReturn: DEN to ORD
ORD AirportDEN Airport

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