Dulles (IAD) to Denver (DEN) flights
United Airlines flies nonstop from Washington Dulles International Airport to Denver International Airport, with about 60 flights a week in July 2026. The 1,452-mile flight takes about 3h 54m gate to gate.
- Distance
- 1,452 mi · 2,337 km
- Flight time
- 3h 54m
- Airlines
- 1
- Seats filled
- 85%
Airlines flying IAD to DEN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 60 | Boeing 737-900ER, Airbus A321, Boeing 757-300 | 482,035 | 3h 55m |
| Southwest AirlinesSeasonal or ended | n/a | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 91,801 | 3h 49m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to DEN flight schedule
13 flight numbers flew this route in August 2026, 7 of them almost daily. The first usually leaves at 6:30am and the last at 10:34pm. 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 1561United Airlines | 6:30am | 8:24am | 12 | 100% |
| UA 2031United Airlines | 6:30am | 8:22am | 10 | 100% |
| UA 1882United Airlines | 8:15am | 10:09am | 21 | 95% |
| UA 792United Airlines | 8:15am | 10:10am | 10 | 94% |
| UA 1865United Airlines | 10:10am | 12:01pm | 31 | 91% |
| UA 1587United Airlines | 12:50pm | 2:39pm | 31 | 92% |
| UA 1126United Airlines | 2:43pm | 4:33pm | 31 | 79% |
| UA 395United Airlines | 3:56pm | 6:03pm | 10 | 78% |
| UA 1490United Airlines | 4:15pm | 6:15pm | 21 | 47% |
| UA 599United Airlines | 5:26pm | 7:30pm | 31 | 69% |
| UA 1328United Airlines | 7:20pm | 9:16pm | 12 | 58% |
| UA 2667United Airlines | 7:20pm | 9:27pm | 6 | 72% |
| UA 495United Airlines | 10:34pm | 12:30am | 31 | 85% |
Is IAD to DEN on time?
From September 2025 to August 2026, 83% of 3,387 flights arrived within 15 minutes of schedule and 0.6% were cancelled. Flights leaving around 9am were the most punctual (93%), those around 5pm the least (69%). Most delay time was caused by late-arriving aircraft (35%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 2,791 | 84% | 12 min | 0.5% |
| Southwest Airlines | 596 | 78% | 12 min | 1% |
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 | 139 | 91% | |
| 6am to 7am | 145 | 96% | |
| 7am to 8am | 70 | 93% | |
| 8am to 9am | 365 | 87% | |
| 9am to 10am | 182 | 93% | |
| 10am to 11am | 211 | 90% | |
| 12pm to 1pm | 364 | 91% | |
| 2pm to 3pm | 387 | 83% | |
| 3pm to 4pm | 170 | 78% | |
| 4pm to 5pm | 244 | 75% | |
| 5pm to 6pm | 468 | 69% | |
| 7pm to 8pm | 153 | 69% | |
| 10pm to 11pm | 341 | 86% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 330 | 56,191 | |
| September 2025 | 293 | 51,051 | |
| October 2025 | 283 | 47,651 | |
| November 2025 | 275 | 43,247 | |
| December 2025 | 304 | 56,056 | |
| January 2026 | 270 | 42,166 | |
| February 2026 | 256 | 39,705 | |
| March 2026 | 297 | 47,195 | |
| April 2026 | 291 | 45,281 | |
| May 2026 | 315 | 50,908 | |
| June 2026 | 261 | 46,877 | |
| July 2026 | 265 | 47,508 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.