San Francisco (SFO) to St Louis (STL) flights
United Airlines, Southwest Airlines fly nonstop from San Francisco International Airport to St. Louis Lambert International Airport, with about 14 flights a week in July 2026. The 1,735-mile flight takes about 3h 51m gate to gate.
- Distance
- 1,735 mi · 2,792 km
- Flight time
- 3h 51m
- Airlines
- 2
- Seats filled
- 84%
Airlines flying SFO to STL
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 7 | Boeing 737 MAX 8, Airbus A319, Boeing 737 MAX 9 | 22,740 | 3h 50m |
| Southwest Airlines | 7 | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 49,345 | 3h 44m |
| SkyWest AirlinesSeasonal or ended | n/a | Embraer E175 | 13,507 | 4h 1m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SFO to STL flight schedule
3 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 12:00pm and the last at 12:40pm. 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 3564Southwest Airlines | 12:00pm | 5:50pm | 28 | 15% |
| UA 2090United Airlines | 12:12pm | 6:17pm | 10 | 77% |
| UA 2818United Airlines | 12:40pm | 6:39pm | 15 | 33% |
Is SFO to STL on time?
From September 2025 to August 2026, 61% of 754 flights arrived within 15 minutes of schedule and 0.9% were cancelled. Flights leaving around 9am were the most punctual (86%), those around 1pm the least (37%). Most delay time was caused by late-arriving aircraft (51%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 412 | 78% | 17 min | 1.5% |
| Southwest Airlines | 342 | 40% | 38 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 |
|---|---|---|---|
| 9am to 10am | 51 | 86% | |
| 10am to 11am | 229 | 65% | |
| 11am to 12pm | 98 | 56% | |
| 12pm to 1pm | 226 | 50% | |
| 1pm to 2pm | 47 | 37% | |
| 4pm to 5pm | 41 | 76% | |
| 11pm to 12am | 52 | 76% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 62 | 8,424 | |
| September 2025 | 60 | 7,299 | |
| October 2025 | 61 | 6,966 | |
| November 2025 | 57 | 8,090 | |
| December 2025 | 61 | 6,802 | |
| January 2026 | 66 | 5,200 | |
| February 2026 | 59 | 5,375 | |
| March 2026 | 58 | 6,039 | |
| April 2026 | 75 | 6,809 | |
| May 2026 | 72 | 7,340 | |
| June 2026 | 60 | 8,975 | |
| July 2026 | 61 | 8,514 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.