Denver (DEN) to Dulles (IAD) flights
United Airlines flies nonstop from Denver International Airport to Washington Dulles International Airport, with about 61 flights a week in July 2026. The 1,452-mile flight takes about 3h 17m gate to gate.
- Distance
- 1,452 mi · 2,337 km
- Flight time
- 3h 17m
- Airlines
- 1
- Seats filled
- 85%
Airlines flying DEN to IAD
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 61 | Airbus A321, Boeing 737-900ER, Boeing 737 MAX 9 | 486,456 | 3h 18m |
| Southwest AirlinesSeasonal or ended | n/a | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 92,667 | 3h 12m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
DEN to IAD flight schedule
10 flight numbers flew this route in August 2026, 8 of them almost daily. The first usually leaves at 6:00am and the last at 11:59pm. 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 1279United Airlines | 6:00am | 11:24am | 22 | 94% |
| UA 1101United Airlines | 8:00am | 1:29pm | 31 | 94% |
| UA 2087United Airlines | 10:20am | 3:46pm | 31 | 81% |
| UA 2853United Airlines | 12:22pm | 5:50pm | 31 | 79% |
| UA 347United Airlines | 1:58pm | 7:23pm | 31 | 87% |
| UA 421United Airlines | 3:40pm | 9:08pm | 31 | 70% |
| UA 2408United Airlines | 5:50pm | 11:19pm | 31 | 72% |
| UA 1610United Airlines | 7:05pm | 12:32am | 12 | 50% |
| UA 1412United Airlines | 7:13pm | 12:45am | 6 | 61% |
| UA 1924United Airlines | 11:59pm | 5:25am | 31 | 94% |
Is DEN to IAD on time?
From September 2025 to August 2026, 82% of 3,385 flights arrived within 15 minutes of schedule and 0.6% were cancelled. Flights leaving around 7am were the most punctual (94%), those around 6pm the least (60%). Most delay time was caused by late-arriving aircraft (45%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 2,790 | 85% | 11 min | 0.5% |
| Southwest Airlines | 595 | 68% | 17 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 |
|---|---|---|---|
| 6am to 7am | 199 | 94% | |
| 7am to 8am | 199 | 94% | |
| 8am to 9am | 234 | 92% | |
| 9am to 10am | 69 | 85% | |
| 10am to 11am | 437 | 78% | |
| 11am to 12pm | 301 | 82% | |
| 12pm to 1pm | 121 | 73% | |
| 1pm to 2pm | 350 | 85% | |
| 2pm to 3pm | 71 | 84% | |
| 3pm to 4pm | 270 | 82% | |
| 4pm to 5pm | 155 | 83% | |
| 5pm to 6pm | 337 | 74% | |
| 6pm to 7pm | 170 | 60% | |
| 7pm to 8pm | 128 | 49% | |
| 11pm to 12am | 341 | 94% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 337 | 58,195 | |
| September 2025 | 295 | 51,507 | |
| October 2025 | 284 | 45,501 | |
| November 2025 | 275 | 43,205 | |
| December 2025 | 306 | 52,530 | |
| January 2026 | 268 | 41,422 | |
| February 2026 | 261 | 40,221 | |
| March 2026 | 298 | 48,502 | |
| April 2026 | 291 | 48,442 | |
| May 2026 | 316 | 53,428 | |
| June 2026 | 264 | 47,617 | |
| July 2026 | 268 | 48,553 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.