Houston (IAH) to Denver (DEN) flights
United Airlines, Frontier Airlines fly nonstop from George Bush Intercontinental Airport to Denver International Airport, with about 99 flights a week in July 2026. The 861-mile flight takes about 2h 34m gate to gate.
- Distance
- 861 mi · 1,386 km
- Flight time
- 2h 34m
- Airlines
- 2
- Seats filled
- 84%
Airlines flying IAH to DEN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 82 | Airbus A321, Boeing 737-900ER, Boeing 757-300 | 686,737 | 2h 33m |
| Frontier Airlines | 17 | Airbus A321, Airbus A320neo, Airbus A320-100/200 | 141,132 | 2h 37m |
| SkyWest AirlinesSeasonal or ended | n/a | Embraer E175, Bombardier CRJ550, Bombardier CRJ200 | 76 | 3h 3m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAH to DEN flight schedule
22 flight numbers flew this route in August 2026, 12 of them almost daily. The first usually leaves at 5:15am and the last at 10:14pm. 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 1874United Airlines | 5:15am | 6:47am | 31 | 96% |
| F9 3229Frontier Airlines | 6:30am | 8:14am | 31 | 88% |
| UA 1664United Airlines | 6:30am | 8:02am | 9 | 72% |
| UA 2643United Airlines | 6:30am | 8:02am | 10 | 96% |
| UA 1575United Airlines | 7:20am | 8:55am | 31 | 80% |
| UA 1906United Airlines | 8:30am | 10:07am | 21 | 95% |
| UA 2816United Airlines | 8:30am | 10:05am | 10 | 98% |
| UA 1450United Airlines | 9:32am | 11:08am | 10 | 86% |
| UA 584United Airlines | 9:33am | 11:10am | 21 | 91% |
| UA 1409United Airlines | 10:31am | 12:07pm | 10 | 82% |
| UA 2787United Airlines | 10:31am | 12:08pm | 21 | 100% |
| UA 2168United Airlines | 12:30pm | 2:15pm | 31 | 88% |
| UA 2767United Airlines | 3:00pm | 4:45pm | 31 | 72% |
| UA 484United Airlines | 4:21pm | 6:23pm | 10 | 77% |
| UA 470United Airlines | 4:27pm | 6:18pm | 21 | 62% |
| F9 3227Frontier Airlines | 6:14pm | 8:03pm | 31 | 68% |
| UA 1654United Airlines | 6:18pm | 8:09pm | 31 | 67% |
| UA 2339United Airlines | 8:22pm | 10:15pm | 10 | 77% |
| UA 685United Airlines | 8:24pm | 10:15pm | 21 | 91% |
| F9 3205Frontier Airlines | 10:09pm | 11:58pm | 14 | 78% |
| UA 1066United Airlines | 10:10pm | 11:57pm | 7 | 89% |
| F9 2995Frontier Airlines | 10:14pm | 12:03am | 4 | 77% |
Is IAH to DEN on time?
From September 2025 to August 2026, 83% of 4,728 flights arrived within 15 minutes of schedule and 0.4% were cancelled. Flights leaving around 8am were the most punctual (92%), those around 6pm the least (66%). Most delay time was caused by late-arriving aircraft (42%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 3,894 | 84% | 12 min | 0.2% |
| Frontier Airlines | 834 | 80% | 16 min | 1.2% |
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 | 195 | 97% | |
| 6am to 7am | 484 | 91% | |
| 7am to 8am | 321 | 88% | |
| 8am to 9am | 378 | 92% | |
| 9am to 10am | 239 | 85% | |
| 10am to 11am | 381 | 88% | |
| 11am to 12pm | 239 | 83% | |
| 12pm to 1pm | 370 | 90% | |
| 2pm to 3pm | 261 | 79% | |
| 3pm to 4pm | 131 | 72% | |
| 4pm to 5pm | 395 | 71% | |
| 6pm to 7pm | 432 | 66% | |
| 8pm to 9pm | 383 | 79% | |
| 9pm to 10pm | 129 | 85% | |
| 10pm to 11pm | 341 | 83% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 403 | 68,060 | |
| September 2025 | 384 | 61,938 | |
| October 2025 | 401 | 67,267 | |
| November 2025 | 357 | 65,066 | |
| December 2025 | 396 | 76,212 | |
| January 2026 | 394 | 67,610 | |
| February 2026 | 352 | 63,366 | |
| March 2026 | 408 | 70,654 | |
| April 2026 | 362 | 63,141 | |
| May 2026 | 416 | 72,829 | |
| June 2026 | 430 | 73,731 | |
| July 2026 | 437 | 78,130 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.