Boise (BOI) to Denver (DEN) flights
Southwest Airlines, United Airlines, SkyWest Airlines, Frontier Airlines fly nonstop from Boise Air Terminal/Gowen Field to Denver International Airport, with about 58 flights a week in July 2026. The 649-mile flight takes about 1h 55m gate to gate.
- Distance
- 649 mi · 1,044 km
- Flight time
- 1h 55m
- Airlines
- 4
- Seats filled
- 84%
Airlines flying BOI to DEN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 21 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8, Boeing 737-800 | 147,088 | 1h 47m |
| United Airlines | 21 | Boeing 737-900ER, Boeing 737-800, Airbus A319 | 134,376 | 1h 55m |
| SkyWest Airlines | 14 | Embraer E175, Bombardier CRJ700, Bombardier CRJ200 | 54,838 | 2h 3m |
| Frontier Airlines | 3 | Airbus A320neo, Airbus A321, Airbus A320-100/200 | 17,514 | 2h 0m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
BOI to DEN flight schedule
11 flight numbers flew this route in August 2026, 7 of them almost daily. The first usually leaves at 5:00am and the last at 5:44pm. 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 5924United Airlines · operated by SkyWest Airlines | 5:00am | 7:10am | 30 | 91% |
| UA 1782United Airlines | 6:30am | 8:31am | 31 | 91% |
| WN 336Southwest Airlines | 8:05am | 9:55am | 14 | 86% |
| UA 6041United Airlines · operated by SkyWest Airlines | 10:20am | 12:27pm | 10 | 91% |
| UA 1139United Airlines | 10:31am | 12:33pm | 20 | 90% |
| WN 1690Southwest Airlines | 11:30am | 1:20pm | 28 | 71% |
| F9 3934Frontier Airlines | 1:24pm | 3:30pm | 13 | 82% |
| WN 173Southwest Airlines | 2:25pm | 4:20pm | 16 | 53% |
| UA 2173United Airlines | 2:44pm | 4:45pm | 31 | 76% |
| WN 4747Southwest Airlines | 2:55pm | 4:45pm | 24 | 65% |
| UA 2395United Airlines | 5:44pm | 7:45pm | 31 | 47% |
Is BOI to DEN on time?
From September 2025 to August 2026, 82% of 3,034 flights arrived within 15 minutes of schedule and 0.1% were cancelled. Flights leaving around 5am were the most punctual (93%), those around 5pm the least (68%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (35%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,814 | 84% | 17 min | 0.1% |
| Southwest Airlines | 1,088 | 78% | 14 min | 0.2% |
| Frontier Airlines | 132 | 82% | 19 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 | 395 | 93% | |
| 6am to 7am | 323 | 93% | |
| 7am to 8am | 249 | 92% | |
| 8am to 9am | 77 | 81% | |
| 10am to 11am | 469 | 90% | |
| 11am to 12pm | 159 | 85% | |
| 12pm to 1pm | 144 | 83% | |
| 1pm to 2pm | 94 | 82% | |
| 2pm to 3pm | 445 | 75% | |
| 3pm to 4pm | 71 | 75% | |
| 4pm to 5pm | 138 | 34% | |
| 5pm to 6pm | 414 | 68% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 259 | 32,749 | |
| September 2025 | 253 | 31,234 | |
| October 2025 | 260 | 31,315 | |
| November 2025 | 248 | 27,433 | |
| December 2025 | 261 | 28,321 | |
| January 2026 | 259 | 25,944 | |
| February 2026 | 236 | 24,758 | |
| March 2026 | 256 | 28,657 | |
| April 2026 | 248 | 26,177 | |
| May 2026 | 261 | 31,252 | |
| June 2026 | 254 | 33,130 | |
| July 2026 | 259 | 32,846 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.