Flight Check

Best Airline: DEN to PHL

Denver to Philadelphia — airline reliability comparison

United Airlines is the most reliable airline on the DEN to PHL route with a 80% on-time rate, compared to Frontier Airlines at 60%. Based on 3,487 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%
American Airlines80%
Southwest Airlines66%
Frontier Airlines60%

DEN to PHL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest80%0.6%63m3,487
American AirlinesAA80%1.8%103m2,998
Southwest AirlinesWN66%0.8%52m2,647
Frontier AirlinesF9Worst60%2.2%80m1,338

Route Overview

74%
Overall On-Time
74m
Avg Delay
1.2%
Cancel Rate
10,479
Total Flights
DEN to PHL Route DetailsReturn: PHL to DEN
DEN AirportPHL Airport

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