Dulles (IAD) to Houston (IAH) flights
United Airlines flies nonstop from Washington Dulles International Airport to George Bush Intercontinental Airport, with about 36 flights a week in July 2026. The 1,190-mile flight takes about 3h 18m gate to gate.
- Distance
- 1,190 mi · 1,915 km
- Flight time
- 3h 18m
- Airlines
- 1
- Seats filled
- 84%
Airlines flying IAD to IAH
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 36 | Boeing 737-900ER, Boeing 737-800, Boeing 737 MAX 9 | 264,025 | 3h 18m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to IAH flight schedule
8 flight numbers flew this route in August 2026, 4 of them almost daily. The first usually leaves at 6:30am and the last at 10:29pm. 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 1935United Airlines | 6:30am | 8:39am | 10 | 100% |
| UA 2228United Airlines | 6:30am | 8:44am | 15 | 100% |
| UA 1524United Airlines | 8:31am | 10:52am | 31 | 90% |
| UA 1535United Airlines | 12:57pm | 3:17pm | 31 | 85% |
| UA 2607United Airlines | 3:02pm | 5:23pm | 12 | 73% |
| UA 2217United Airlines | 5:55pm | 8:18pm | 31 | 72% |
| UA 1986United Airlines | 10:20pm | 12:45am | 10 | 79% |
| UA 1463United Airlines | 10:29pm | 12:45am | 21 | 85% |
Is IAD to IAH on time?
From September 2025 to August 2026, 85% of 1,862 flights arrived within 15 minutes of schedule and 0.5% were cancelled. Flights leaving around 6am were the most punctual (92%), those around 5pm the least (72%). Most delay time was caused by air traffic control and airport congestion (32%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,862 | 85% | 12 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 |
|---|---|---|---|
| 6am to 7am | 344 | 92% | |
| 8am to 9am | 365 | 90% | |
| 12pm to 1pm | 362 | 87% | |
| 2pm to 3pm | 47 | 72% | |
| 5pm to 6pm | 366 | 72% | |
| 10pm to 11pm | 285 | 85% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 179 | 23,590 | |
| September 2025 | 195 | 24,638 | |
| October 2025 | 180 | 24,422 | |
| November 2025 | 150 | 20,778 | |
| December 2025 | 141 | 21,709 | |
| January 2026 | 128 | 17,580 | |
| February 2026 | 114 | 15,673 | |
| March 2026 | 145 | 20,301 | |
| April 2026 | 147 | 20,365 | |
| May 2026 | 168 | 23,792 | |
| June 2026 | 179 | 26,971 | |
| July 2026 | 161 | 24,462 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.