Republic Airways is the most reliable airline on the IAD to SDF route with a 88% on-time rate. Based on 1,434 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to SDF
Washington to Louisville — airline reliability comparison
On-Time Rate by Airline
Republic Airways88%
IAD to SDF Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Republic AirwaysYXBest | 88% | 1.1% | 69m | 1,434 |
Route Overview
88%
Overall On-Time
74m
Avg Delay
1%
Cancel Rate
1,444
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.