Buffalo (BUF) to Denver (DEN) flights
Southwest Airlines, United Airlines fly nonstop from Buffalo Niagara International Airport to Denver International Airport, with about 16 flights a week in July 2026. The 1,359-mile flight takes about 3h 33m gate to gate.
- Distance
- 1,359 mi · 2,187 km
- Flight time
- 3h 33m
- Airlines
- 2
- Seats filled
- 87%
Airlines flying BUF to DEN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 9 | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 39,454 | 3h 29m |
| United Airlines | 7 | Boeing 737-800, Boeing 737 MAX 9, Boeing 737-900ER | 42,256 | 3h 37m |
| Frontier AirlinesSeasonal or ended | n/a | Airbus A321, Airbus A320neo | 6,595 | 3h 32m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
BUF to DEN flight schedule
5 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 6:45am and the last at 5:15pm. 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) |
|---|---|---|---|---|
| WN 760Southwest Airlines | 6:45am | 8:10am | 4 | n/a |
| WN 437Southwest Airlines | 6:50am | 8:15am | 12 | 91% |
| UA 1727United Airlines | 8:55am | 10:32am | 31 | 84% |
| WN 4564Southwest Airlines | 3:55pm | 5:20pm | 8 | n/a |
| WN 569Southwest Airlines | 5:15pm | 6:40pm | 4 | n/a |
Is BUF to DEN on time?
From September 2025 to August 2026, 74% of 573 flights arrived within 15 minutes of schedule and 0.2% were cancelled. Flights leaving around 9am were the most punctual (85%), those around 4pm the least (32%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (37%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 293 | 84% | 12 min | 0% |
| Southwest Airlines | 258 | 64% | 19 min | 0.4% |
| Frontier Airlines | 22 | 59% | 18 min | 0% |
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 | 27 | 85% | |
| 6am to 7am | 20 | 90% | |
| 7am to 8am | 22 | 86% | |
| 8am to 9am | 225 | 83% | |
| 9am to 10am | 81 | 85% | |
| 10am to 11am | 52 | 80% | |
| 12pm to 1pm | 24 | 75% | |
| 3pm to 4pm | 16 | 44% | |
| 4pm to 5pm | 66 | 32% | |
| 5pm to 6pm | 26 | 42% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 81 | 12,944 | |
| September 2025 | 77 | 12,189 | |
| October 2025 | 70 | 10,722 | |
| November 2025 | 52 | 6,795 | |
| December 2025 | 19 | 2,780 | |
| January 2026 | 14 | 2,200 | |
| February 2026 | 36 | 4,965 | |
| March 2026 | 33 | 4,706 | |
| April 2026 | 33 | 4,485 | |
| May 2026 | 36 | 5,129 | |
| June 2026 | 65 | 10,094 | |
| July 2026 | 69 | 11,296 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.