Houston (IAH) to Seattle (SEA) flights
United Airlines, Alaska Airlines fly nonstop from George Bush Intercontinental Airport to Seattle-Tacoma International Airport, with about 52 flights a week in July 2026. The 1,874-mile flight takes about 4h 46m gate to gate.
- Distance
- 1,874 mi · 3,016 km
- Flight time
- 4h 46m
- Airlines
- 2
- Seats filled
- 87%
Airlines flying IAH to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 31 | Boeing 737-800, Boeing 737 MAX 9, Airbus A320-100/200 | 178,182 | 4h 47m |
| Alaska Airlines | 21 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 128,604 | 4h 44m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAH to SEA flight schedule
10 flight numbers flew this route in August 2026, 6 of them almost daily. The first usually leaves at 6:02am and the last at 7:55pm. 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) |
|---|---|---|---|---|
| AS 453Alaska Airlines | 6:02am | 8:40am | 18 | 87% |
| AS 241Alaska Airlines | 8:00am | 10:41am | 31 | 83% |
| UA 2654United Airlines | 8:00am | 10:47am | 10 | 96% |
| UA 2205United Airlines | 9:57am | 12:48pm | 31 | 79% |
| UA 2228United Airlines | 12:04pm | 2:52pm | 21 | 100% |
| AS 439Alaska Airlines | 2:38pm | 5:21pm | 31 | 77% |
| UA 2638United Airlines | 4:20pm | 7:08pm | 31 | 70% |
| UA 692United Airlines | 6:30pm | 9:18pm | 8 | 73% |
| UA 2341United Airlines | 6:45pm | 9:36pm | 21 | 81% |
| UA 2456United Airlines | 7:55pm | 10:42pm | 8 | 75% |
Is IAH to SEA on time?
From September 2025 to August 2026, 81% of 2,072 flights arrived within 15 minutes of schedule and 0.2% were cancelled. Flights leaving around 6am were the most punctual (93%), those around 6pm the least (70%). Most delay time was caused by late-arriving aircraft (39%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,230 | 80% | 12 min | 0.1% |
| Alaska Airlines | 842 | 82% | 11 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 | 151 | 93% | |
| 7am to 8am | 196 | 82% | |
| 8am to 9am | 213 | 87% | |
| 9am to 10am | 182 | 84% | |
| 10am to 11am | 183 | 79% | |
| 2pm to 3pm | 134 | 86% | |
| 4pm to 5pm | 330 | 81% | |
| 6pm to 7pm | 171 | 70% | |
| 7pm to 8pm | 368 | 74% | |
| 8pm to 9pm | 104 | 76% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 225 | 33,260 | |
| September 2025 | 199 | 26,891 | |
| October 2025 | 174 | 23,789 | |
| November 2025 | 148 | 20,665 | |
| December 2025 | 167 | 23,599 | |
| January 2026 | 133 | 19,590 | |
| February 2026 | 112 | 16,686 | |
| March 2026 | 143 | 21,930 | |
| April 2026 | 150 | 22,706 | |
| May 2026 | 183 | 28,474 | |
| June 2026 | 217 | 32,856 | |
| July 2026 | 230 | 36,340 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.