Louisville (SDF) to Dulles (IAD) flights
Republic Airline, Mesa Airlines fly nonstop from Louisville Muhammad Ali International Airport to Washington Dulles International Airport, with about 21 flights a week in July 2026. The 451-mile flight takes about 1h 35m gate to gate.
- Distance
- 451 mi · 726 km
- Flight time
- 1h 35m
- Airlines
- 2
- Seats filled
- 76%
Airlines flying SDF to IAD
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Republic Airline | 14 | Embraer E175 | 12,686 | 1h 36m |
| Mesa Airlines | 7 | Embraer E175 | 36,655 | 1h 34m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SDF to IAD flight schedule
4 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 6:00am and the last at 1:56pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 3438United Airlines · operated by Republic Airline | 6:00am | 7:35am | 25 | 95% |
| UA 3508United Airlines · operated by Republic Airline | 10:05am | 11:47am | 21 | 93% |
| UA 3717United Airlines · operated by Republic Airline | 10:05am | 11:45am | 10 | 87% |
| UA 4067United Airlines · operated by Mesa Airlines | 1:56pm | 3:34pm | 30 | 88% |
Is SDF to IAD on time?
From September 2025 to August 2026, 89% of 866 flights arrived within 15 minutes of schedule and 0.8% were cancelled. Flights leaving around 6am were the most punctual (95%), those around 2pm the least (83%). Most delay time was caused by late-arriving aircraft (42%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 866 | 89% | 11 min | 0.8% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 5am to 6am | 20 | 100% | |
| 6am to 7am | 97 | 95% | |
| 9am to 10am | 262 | 88% | |
| 10am to 11am | 103 | 90% | |
| 1pm to 2pm | 126 | 92% | |
| 2pm to 3pm | 258 | 83% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 108 | 5,066 | |
| September 2025 | 83 | 4,731 | |
| October 2025 | 62 | 3,789 | |
| November 2025 | 59 | 3,357 | |
| December 2025 | 62 | 3,633 | |
| January 2026 | 59 | 2,997 | |
| February 2026 | 53 | 3,034 | |
| March 2026 | 63 | 3,624 | |
| April 2026 | 60 | 3,435 | |
| May 2026 | 93 | 5,269 | |
| June 2026 | 90 | 5,408 | |
| July 2026 | 92 | 5,369 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.