Seattle (SEA) to Houston (IAH) flights
United Airlines, Alaska Airlines fly nonstop from Seattle-Tacoma International Airport to George Bush Intercontinental Airport, with about 52 flights a week in July 2026. The 1,874-mile flight takes about 4h 15m gate to gate.
- Distance
- 1,874 mi · 3,016 km
- Flight time
- 4h 15m
- Airlines
- 2
- Seats filled
- 87%
Airlines flying SEA to IAH
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 31 | Boeing 737 MAX 9, Airbus A320-100/200, Boeing 737-800 | 177,734 | 4h 14m |
| Alaska Airlines | 21 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 128,720 | 4h 16m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SEA to IAH flight schedule
10 flight numbers flew this route in August 2026, 5 of them almost daily. The first usually leaves at 5:00am 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 2748United Airlines | 5:00am | 11:21am | 10 | 89% |
| UA 2135United Airlines | 7:00am | 1:28pm | 31 | 93% |
| AS 438Alaska Airlines | 10:52am | 5:16pm | 31 | 71% |
| UA 2293United Airlines | 11:55am | 6:35pm | 10 | 89% |
| UA 1752United Airlines | 12:10pm | 6:40pm | 21 | 91% |
| UA 1660United Airlines | 5:15pm | 11:39pm | 29 | 83% |
| AS 1573Alaska Airlines | 5:33pm | 11:59pm | 18 | 73% |
| AS 240Alaska Airlines | 5:34pm | 11:59pm | 13 | 69% |
| AS 398Alaska Airlines | 11:57pm | 6:20am | 17 | 85% |
| UA 2379United Airlines | 11:59pm | 6:17am | 29 | 84% |
Is SEA to IAH on time?
From September 2025 to August 2026, 84% of 2,071 flights arrived within 15 minutes of schedule and 0.3% were cancelled. Flights leaving around 7am were the most punctual (93%), those around 11am the least (70%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (48%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,230 | 88% | 10 min | 0.2% |
| Alaska Airlines | 841 | 78% | 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 |
|---|---|---|---|
| 5am to 6am | 90 | 90% | |
| 6am to 7am | 101 | 93% | |
| 7am to 8am | 263 | 93% | |
| 9am to 10am | 56 | 89% | |
| 10am to 11am | 199 | 78% | |
| 11am to 12pm | 190 | 70% | |
| 12pm to 1pm | 114 | 84% | |
| 1pm to 2pm | 124 | 84% | |
| 2pm to 3pm | 45 | 78% | |
| 5pm to 6pm | 392 | 86% | |
| 11pm to 12am | 450 | 83% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 224 | 34,521 | |
| September 2025 | 198 | 28,054 | |
| October 2025 | 175 | 25,512 | |
| November 2025 | 148 | 21,603 | |
| December 2025 | 168 | 24,515 | |
| January 2026 | 133 | 18,737 | |
| February 2026 | 112 | 16,306 | |
| March 2026 | 141 | 21,562 | |
| April 2026 | 150 | 22,596 | |
| May 2026 | 182 | 25,092 | |
| June 2026 | 216 | 32,231 | |
| July 2026 | 230 | 35,725 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.