Flight Check

Best Airline: DEN to RDU

Denver to Raleigh — airline reliability comparison

United Airlines is the most reliable airline on the DEN to RDU route with a 80% on-time rate, compared to Southwest Airlines at 64%. Based on 3,004 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%
Frontier Airlines79%
Southwest Airlines64%

DEN to RDU Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest80%0.8%58m3,004
Frontier AirlinesF979%0.8%62m1,378
Southwest AirlinesWNWorst64%0.5%52m2,400

Route Overview

74%
Overall On-Time
57m
Avg Delay
0.8%
Cancel Rate
6,782
Total Flights
DEN to RDU Route DetailsReturn: RDU to DEN
DEN AirportRDU Airport

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