Route
SDF → IAD
Louisville Muhammad Ali International Airport Washington Dulles International Airport
451 miles
Return route IAD → SDF →
How punctual is this route?
- On-time arrivals
- 93.1%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 85 min
- Flights arriving 15+ minutes late
- Flights tracked
- 246
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 44%
- Extreme weather 24%
- Late-arriving aircraft 21%
- Air traffic control & airport 11%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 100.0% | 24 |
| November 2025 | 100.0% | 1 |
| April 2026 | 0.0% | 1 |
| May 2026 | 97.6% | 42 |
| June 2026 | 86.7% | 60 |
| July 2026 | 90.2% | 62 |
| August 2026 | 98.2% | 56 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Republic Airways | 243 | 93.8% | 0.4% | 94 min |
| United Airlines | 3 | 33.3% | 0.0% | 21 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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