Tucson (TUS) to Denver (DEN) flights
Southwest Airlines, United Airlines fly nonstop from Tucson International Airport to Denver International Airport, with about 34 flights a week in July 2026. The 639-mile flight takes about 1h 54m gate to gate.
- Distance
- 639 mi · 1,028 km
- Flight time
- 1h 54m
- Airlines
- 2
- Seats filled
- 78%
Airlines flying TUS to DEN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 20 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8, Boeing 737-800 | 152,445 | 1h 48m |
| United Airlines | 14 | Boeing 737-800, Airbus A319, Airbus A320-100/200 | 100,265 | 1h 53m |
| SkyWest AirlinesSeasonal or ended | n/a | Embraer E175, Bombardier CRJ700, Bombardier CRJ200 | 36,979 | 2h 5m |
| Frontier AirlinesSeasonal or ended | n/a | Airbus A320neo, Airbus A321, Airbus A320-100/200 | 11,740 | 1h 56m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
TUS to DEN flight schedule
10 flight numbers flew this route in August 2026, 5 of them almost daily. The first usually leaves at 5:30am and the last at 2:00pm. 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 1540United Airlines | 5:30am | 8:27am | 21 | 95% |
| UA 2418United Airlines | 5:45am | 8:38am | 10 | 91% |
| WN 3969Southwest Airlines | 7:00am | 9:50am | 10 | 90% |
| WN 2745Southwest Airlines | 7:25am | 10:15am | 28 | 79% |
| UA 1656United Airlines | 9:15am | 12:13pm | 20 | 100% |
| WN 2495Southwest Airlines | 10:25am | 1:20pm | 4 | n/a |
| WN 2406Southwest Airlines | 11:40am | 2:30pm | 20 | 65% |
| WN 4415Southwest Airlines | 1:20pm | 4:15pm | 4 | n/a |
| UA 2671United Airlines | 1:29pm | 4:32pm | 31 | 80% |
| WN 4991Southwest Airlines | 2:00pm | 4:55pm | 12 | 42% |
Is TUS to DEN on time?
From September 2025 to August 2026, 84% of 2,719 flights arrived within 15 minutes of schedule and 0.6% were cancelled. Flights leaving around 5am were the most punctual (95%), those around 3pm the least (60%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (34%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,445 | 87% | 12 min | 0.6% |
| Southwest Airlines | 1,197 | 80% | 14 min | 0.6% |
| Frontier Airlines | 77 | 83% | 10 min | 1.3% |
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 | 219 | 95% | |
| 6am to 7am | 383 | 94% | |
| 7am to 8am | 204 | 93% | |
| 8am to 9am | 116 | 93% | |
| 9am to 10am | 262 | 89% | |
| 10am to 11am | 307 | 84% | |
| 11am to 12pm | 108 | 81% | |
| 1pm to 2pm | 308 | 81% | |
| 2pm to 3pm | 248 | 70% | |
| 3pm to 4pm | 174 | 60% | |
| 4pm to 5pm | 171 | 78% | |
| 5pm to 6pm | 153 | 85% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 193 | 20,431 | |
| September 2025 | 195 | 23,382 | |
| October 2025 | 259 | 29,427 | |
| November 2025 | 257 | 26,211 | |
| December 2025 | 271 | 27,244 | |
| January 2026 | 254 | 22,611 | |
| February 2026 | 249 | 27,179 | |
| March 2026 | 281 | 33,682 | |
| April 2026 | 268 | 28,822 | |
| May 2026 | 240 | 25,013 | |
| June 2026 | 150 | 19,153 | |
| July 2026 | 151 | 18,274 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.