Dulles (IAD) to Buffalo (BUF) flights
CommuteAir, Republic Airline, GoJet Airlines fly nonstop from Washington Dulles International Airport to Buffalo Niagara International Airport, with about 22 flights a week in July 2026. The 283-mile flight takes about 1h 23m gate to gate.
- Distance
- 283 mi · 455 km
- Flight time
- 1h 23m
- Airlines
- 3
- Seats filled
- 87%
Airlines flying IAD to BUF
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| CommuteAir | 11 | Embraer ERJ-145 | 30,340 | 1h 25m |
| Republic Airline | 8 | Embraer E175, Embraer E170 | 8,332 | 1h 20m |
| GoJet Airlines | 2 | Bombardier CRJ550 | 8,800 | 1h 22m |
| Mesa AirlinesSeasonal or ended | n/a | Embraer E175 | 6,244 | 1h 16m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to BUF flight schedule
8 flight numbers flew this route in August 2026, 2 of them almost daily. The first usually leaves at 8:25am and the last at 10:26pm. 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 3514United Airlines · operated by Republic Airline | 8:25am | 9:51am | 6 | 95% |
| UA 4476United Airlines · operated by GoJet Airlines | 8:25am | 9:48am | 15 | 100% |
| UA 4335United Airlines · operated by CommuteAir | 12:50pm | 2:18pm | 26 | 83% |
| UA 4358United Airlines · operated by CommuteAir | 5:36pm | 7:00pm | 12 | 92% |
| UA 4546United Airlines · operated by GoJet Airlines | 5:36pm | 6:58pm | 7 | 64% |
| UA 4823United Airlines · operated by CommuteAir | 5:36pm | 7:09pm | 10 | 75% |
| UA 4480United Airlines · operated by GoJet Airlines | 10:18pm | 11:44pm | 21 | 71% |
| UA 3516United Airlines · operated by Republic Airline | 10:26pm | 11:59pm | 8 | 85% |
Is IAD to BUF on time?
From September 2025 to August 2026, 81% of 1,149 flights arrived within 15 minutes of schedule and 2.6% were cancelled. Flights leaving around 8am were the most punctual (89%), those around 5pm the least (75%). Most delay time was caused by late-arriving aircraft (47%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,149 | 81% | 18 min | 2.6% |
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 |
|---|---|---|---|
| 8am to 9am | 231 | 89% | |
| 12pm to 1pm | 331 | 82% | |
| 5pm to 6pm | 364 | 75% | |
| 10pm to 11pm | 223 | 78% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 115 | 6,138 | |
| September 2025 | 98 | 5,122 | |
| October 2025 | 89 | 4,032 | |
| November 2025 | 86 | 3,819 | |
| December 2025 | 73 | 3,562 | |
| January 2026 | 64 | 2,790 | |
| February 2026 | 68 | 3,169 | |
| March 2026 | 106 | 4,826 | |
| April 2026 | 106 | 4,711 | |
| May 2026 | 116 | 5,992 | |
| June 2026 | 105 | 4,785 | |
| July 2026 | 98 | 5,209 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.