St Louis (STL) to San Francisco (SFO) flights
Southwest Airlines, United Airlines fly nonstop from St. Louis Lambert International Airport to San Francisco International Airport, with about 14 flights a week in July 2026. The 1,735-mile flight takes about 4h 27m gate to gate.
- Distance
- 1,735 mi · 2,792 km
- Flight time
- 4h 27m
- Airlines
- 2
- Seats filled
- 83%
Airlines flying STL to SFO
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 7 | Boeing 737-800, Boeing 737 MAX 8, Boeing 737-700 / MAX 7 | 51,442 | 4h 17m |
| United Airlines | 7 | Boeing 737 MAX 8, Airbus A319, Boeing 737 MAX 9 | 21,162 | 4h 20m |
| SkyWest AirlinesSeasonal or ended | n/a | Embraer E175 | 12,645 | 4h 49m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STL to SFO flight schedule
4 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 8:25am and the last at 7:23pm. 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) |
|---|---|---|---|---|
| WN 4157Southwest Airlines | 8:25am | 10:35am | 20 | 35% |
| UA 1257United Airlines | 8:42am | 11:04am | 15 | 40% |
| WN 4082Southwest Airlines | 2:15pm | 4:25pm | 8 | n/a |
| UA 2482United Airlines | 7:23pm | 9:43pm | 10 | 29% |
Is STL to SFO on time?
From September 2025 to August 2026, 58% of 754 flights arrived within 15 minutes of schedule and 0.7% were cancelled. Flights leaving around 10am were the most punctual (91%), those around 7pm the least (28%). Most delay time was caused by air traffic control and airport congestion (57%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 412 | 59% | 34 min | 1.2% |
| Southwest Airlines | 342 | 56% | 29 min | 0% |
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 | 55 | 72% | |
| 8am to 9am | 200 | 43% | |
| 9am to 10am | 65 | 63% | |
| 10am to 11am | 44 | 91% | |
| 11am to 12pm | 41 | 81% | |
| 12pm to 1pm | 23 | 70% | |
| 5pm to 6pm | 184 | 75% | |
| 7pm to 8pm | 119 | 28% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 62 | 7,977 | |
| September 2025 | 60 | 7,297 | |
| October 2025 | 62 | 6,715 | |
| November 2025 | 57 | 7,633 | |
| December 2025 | 60 | 6,971 | |
| January 2026 | 67 | 5,637 | |
| February 2026 | 60 | 5,659 | |
| March 2026 | 59 | 5,887 | |
| April 2026 | 75 | 6,663 | |
| May 2026 | 71 | 7,718 | |
| June 2026 | 61 | 8,554 | |
| July 2026 | 62 | 8,681 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.