Flight Check

Best Airline: DEN to SDF

Denver to Louisville — airline reliability comparison

United Airlines is the most reliable airline on the DEN to SDF route with a 78% on-time rate, compared to Southwest Airlines at 67%. Based on 2,552 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 Airlines78%
Southwest Airlines67%

DEN to SDF Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest78%0.7%64m2,552
Southwest AirlinesWNWorst67%0.7%55m1,370

Route Overview

74%
Overall On-Time
60m
Avg Delay
0.7%
Cancel Rate
3,926
Total Flights
DEN to SDF Route DetailsReturn: SDF to DEN
DEN AirportSDF Airport

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