St Louis (STL) to San Diego (SAN) flights
Southwest Airlines flies nonstop from St. Louis Lambert International Airport to San Diego International Airport, with about 9 flights a week in July 2026. The 1,557-mile flight takes about 3h 47m gate to gate.
- Distance
- 1,557 mi · 2,506 km
- Flight time
- 3h 47m
- Airlines
- 1
- Seats filled
- 85%
Airlines flying STL to SAN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 9 | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 69,122 | 3h 47m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STL to SAN flight schedule
2 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 8:25am and the last at 2:15pm. 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 3886Southwest Airlines | 8:25am | 10:10am | 24 | 71% |
| WN 3181Southwest Airlines | 2:15pm | 3:55pm | 4 | n/a |
Is STL to SAN on time?
From September 2025 to August 2026, 77% of 470 flights arrived within 15 minutes of schedule and 0.2% were cancelled. Flights leaving around 9am were the most punctual (87%), those around 6pm the least (51%). Most delay time was caused by late-arriving aircraft (38%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 470 | 77% | 12 min | 0.2% |
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 |
|---|---|---|---|
| 8am to 9am | 163 | 85% | |
| 9am to 10am | 52 | 87% | |
| 10am to 11am | 76 | 82% | |
| 1pm to 2pm | 13 | 77% | |
| 2pm to 3pm | 21 | 57% | |
| 3pm to 4pm | 25 | 76% | |
| 4pm to 5pm | 53 | 71% | |
| 6pm to 7pm | 39 | 51% | |
| 9pm to 10pm | 10 | 50% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 37 | 5,174 | |
| September 2025 | 33 | 4,832 | |
| October 2025 | 57 | 8,382 | |
| November 2025 | 48 | 6,848 | |
| December 2025 | 46 | 6,576 | |
| January 2026 | 35 | 5,241 | |
| February 2026 | 35 | 5,106 | |
| March 2026 | 35 | 5,058 | |
| April 2026 | 34 | 4,917 | |
| May 2026 | 36 | 5,476 | |
| June 2026 | 38 | 5,706 | |
| July 2026 | 38 | 5,908 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.