San Francisco (SFO) to Houston (IAH) flights
United Airlines flies nonstop from San Francisco International Airport to George Bush Intercontinental Airport, with about 67 flights a week in July 2026. The 1,635-mile flight takes about 3h 50m gate to gate.
- Distance
- 1,635 mi · 2,631 km
- Flight time
- 3h 50m
- Airlines
- 1
- Seats filled
- 85%
Airlines flying SFO to IAH
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 67 | Boeing 737 MAX 9, Boeing 737-900ER, Boeing 777-200ER/200LR/233LR | 611,138 | 3h 50m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SFO to IAH flight schedule
12 flight numbers flew this route in August 2026, 8 of them almost daily. The first usually leaves at 12:45am 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 604United Airlines | 12:45am | 6:35am | 31 | 81% |
| UA 2168United Airlines | 5:00am | 10:55am | 10 | 97% |
| UA 686United Airlines | 7:05am | 1:08pm | 31 | 95% |
| UA 2498United Airlines | 8:45am | 2:56pm | 31 | 88% |
| UA 1259United Airlines | 10:45am | 4:56pm | 31 | 58% |
| UA 1387United Airlines | 12:24pm | 6:29pm | 31 | 75% |
| UA 2831United Airlines | 2:25pm | 8:30pm | 21 | 57% |
| UA 2002United Airlines | 2:28pm | 8:40pm | 10 | 70% |
| UA 2305United Airlines | 4:40pm | 10:45pm | 31 | 81% |
| UA 2019United Airlines | 6:30pm | 12:28am | 15 | 73% |
| UA 1702United Airlines | 6:54pm | 12:59am | 6 | 81% |
| UA 505United Airlines | 11:59pm | 6:02am | 31 | 82% |
Is SFO to IAH on time?
From September 2025 to August 2026, 84% of 3,578 flights arrived within 15 minutes of schedule and 0.3% were cancelled. Flights leaving around 5am were the most punctual (97%), those around 10am the least (64%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (40%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 3,578 | 84% | 9 min | 0.3% |
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 |
|---|---|---|---|
| 12am to 1am | 362 | 87% | |
| 5am to 6am | 340 | 97% | |
| 7am to 8am | 365 | 96% | |
| 8am to 9am | 121 | 88% | |
| 9am to 10am | 244 | 87% | |
| 10am to 11am | 211 | 64% | |
| 11am to 12pm | 154 | 70% | |
| 12pm to 1pm | 180 | 75% | |
| 1pm to 2pm | 185 | 81% | |
| 2pm to 3pm | 361 | 78% | |
| 4pm to 5pm | 343 | 82% | |
| 6pm to 7pm | 145 | 85% | |
| 7pm to 8pm | 173 | 89% | |
| 11pm to 12am | 365 | 83% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 299 | 49,609 | |
| September 2025 | 291 | 44,484 | |
| October 2025 | 305 | 50,719 | |
| November 2025 | 300 | 53,232 | |
| December 2025 | 312 | 57,600 | |
| January 2026 | 303 | 49,488 | |
| February 2026 | 278 | 45,234 | |
| March 2026 | 308 | 53,295 | |
| April 2026 | 299 | 50,815 | |
| May 2026 | 308 | 48,807 | |
| June 2026 | 299 | 54,357 | |
| July 2026 | 296 | 53,498 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.