Denver (DEN) to Houston (IAH) flights
United Airlines, Frontier Airlines fly nonstop from Denver International Airport to George Bush Intercontinental Airport, with about 100 flights a week in July 2026. The 861-mile flight takes about 2h 26m gate to gate.
- Distance
- 861 mi · 1,386 km
- Flight time
- 2h 26m
- Airlines
- 2
- Seats filled
- 83%
Airlines flying DEN to IAH
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 82 | Airbus A321, Boeing 737-900ER, Boeing 757-300 | 674,768 | 2h 26m |
| Frontier Airlines | 18 | Airbus A321, Airbus A320neo, Airbus A320-100/200 | 138,635 | 2h 26m |
| SkyWest AirlinesSeasonal or ended | n/a | Embraer E175, Bombardier CRJ200 | 37 | 2h 46m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
DEN to IAH flight schedule
18 flight numbers flew this route in August 2026, 12 of them almost daily. The first usually leaves at 5:00am and the last at 9:10pm. 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 320United Airlines | 5:00am | 8:28am | 31 | 97% |
| F9 3206Frontier Airlines | 7:00am | 10:34am | 31 | 86% |
| UA 1720United Airlines | 7:40am | 11:08am | 31 | 90% |
| UA 1129United Airlines | 10:07am | 1:40pm | 10 | 72% |
| UA 1204United Airlines | 10:07am | 1:40pm | 21 | 91% |
| UA 1599United Airlines | 11:44am | 3:15pm | 31 | 78% |
| UA 1829United Airlines | 1:32pm | 5:03pm | 31 | 71% |
| UA 489United Airlines | 3:35pm | 7:06pm | 31 | 78% |
| UA 588United Airlines | 4:20pm | 7:57pm | 19 | 75% |
| UA 1585United Airlines | 5:18pm | 8:55pm | 10 | 73% |
| UA 1587United Airlines | 5:25pm | 8:55pm | 21 | 76% |
| F9 3228Frontier Airlines | 5:35pm | 9:14pm | 18 | 74% |
| UA 1274United Airlines | 6:05pm | 9:41pm | 21 | 52% |
| UA 2791United Airlines | 6:05pm | 9:36pm | 10 | 52% |
| UA 475United Airlines | 7:30pm | 10:56pm | 31 | 74% |
| UA 2419United Airlines | 8:31pm | 11:56pm | 31 | 79% |
| F9 2996Frontier Airlines | 9:06pm | 12:40am | 31 | 74% |
| UA 1253United Airlines | 9:10pm | 12:41am | 7 | 65% |
Is DEN to IAH on time?
From September 2025 to August 2026, 80% of 4,728 flights arrived within 15 minutes of schedule and 0.3% were cancelled. Flights leaving around 5am were the most punctual (96%), those around 1pm the least (71%). Most delay time was caused by late-arriving aircraft (42%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 3,894 | 80% | 14 min | 0.3% |
| Frontier Airlines | 834 | 79% | 13 min | 0.5% |
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 | 382 | 96% | |
| 7am to 8am | 561 | 89% | |
| 9am to 10am | 149 | 83% | |
| 10am to 11am | 242 | 83% | |
| 11am to 12pm | 384 | 81% | |
| 1pm to 2pm | 365 | 71% | |
| 3pm to 4pm | 392 | 78% | |
| 4pm to 5pm | 339 | 79% | |
| 5pm to 6pm | 447 | 74% | |
| 6pm to 7pm | 212 | 69% | |
| 7pm to 8pm | 404 | 76% | |
| 8pm to 9pm | 401 | 77% | |
| 9pm to 10pm | 353 | 72% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 404 | 69,336 | |
| September 2025 | 383 | 62,271 | |
| October 2025 | 403 | 69,141 | |
| November 2025 | 356 | 64,787 | |
| December 2025 | 394 | 74,387 | |
| January 2026 | 392 | 66,462 | |
| February 2026 | 353 | 63,571 | |
| March 2026 | 408 | 68,302 | |
| April 2026 | 361 | 60,190 | |
| May 2026 | 417 | 67,124 | |
| June 2026 | 432 | 70,971 | |
| July 2026 | 445 | 76,898 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.