Houston (IAH) to Dulles (IAD) flights
United Airlines flies nonstop from George Bush Intercontinental Airport to Washington Dulles International Airport, with about 38 flights a week in July 2026. The 1,190-mile flight takes about 3h 1m gate to gate.
- Distance
- 1,190 mi · 1,915 km
- Flight time
- 3h 1m
- Airlines
- 1
- Seats filled
- 82%
Airlines flying IAH to IAD
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 38 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 257,418 | 3h 1m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAH to IAD flight schedule
8 flight numbers flew this route in August 2026, 4 of them almost daily. The first usually leaves at 7:20am and the last at 8:20pm. 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 1549United Airlines | 7:20am | 11:28am | 31 | 92% |
| UA 2366United Airlines | 12:10pm | 4:21pm | 31 | 82% |
| UA 1478United Airlines | 2:48pm | 6:59pm | 17 | 77% |
| UA 2388United Airlines | 4:45pm | 8:56pm | 31 | 68% |
| UA 1373United Airlines | 6:40pm | 10:45pm | 22 | 74% |
| UA 750United Airlines | 7:50pm | 11:55pm | 15 | 93% |
| UA 1387United Airlines | 8:20pm | 12:30am | 6 | n/a |
| UA 2775United Airlines | 8:20pm | 12:31am | 10 | 75% |
Is IAH to IAD on time?
From September 2025 to August 2026, 82% of 1,860 flights arrived within 15 minutes of schedule and 0.4% were cancelled. Flights leaving around 7am were the most punctual (92%), those around 8pm the least (77%). Most delay time was caused by air traffic control and airport congestion (32%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,860 | 82% | 12 min | 0.4% |
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 |
|---|---|---|---|
| 7am to 8am | 364 | 92% | |
| 12pm to 1pm | 365 | 82% | |
| 2pm to 3pm | 98 | 84% | |
| 4pm to 5pm | 345 | 79% | |
| 6pm to 7pm | 344 | 79% | |
| 7pm to 8pm | 185 | 78% | |
| 8pm to 9pm | 95 | 77% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 175 | 24,704 | |
| September 2025 | 193 | 23,654 | |
| October 2025 | 180 | 21,909 | |
| November 2025 | 150 | 20,073 | |
| December 2025 | 142 | 20,350 | |
| January 2026 | 128 | 17,509 | |
| February 2026 | 114 | 15,615 | |
| March 2026 | 150 | 19,287 | |
| April 2026 | 148 | 20,944 | |
| May 2026 | 165 | 23,442 | |
| June 2026 | 185 | 26,525 | |
| July 2026 | 168 | 23,918 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.