Flight Check

Best Airline: SDF to DEN

Louisville to Denver — airline reliability comparison

United Airlines is the most reliable airline on the SDF to DEN route with a 84% on-time rate, compared to Southwest Airlines at 83%. Based on 2,550 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 Airlines84%
Southwest Airlines83%

SDF to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest84%1.1%84m2,550
Southwest AirlinesWNWorst83%0.5%60m1,370

Route Overview

83%
Overall On-Time
78m
Avg Delay
0.9%
Cancel Rate
3,926
Total Flights
SDF to DEN Route DetailsReturn: DEN to SDF
SDF AirportDEN Airport

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