San Diego (SAN) to St Louis (STL) flights
Southwest Airlines flies nonstop from San Diego International Airport to St. Louis Lambert International Airport, with about 9 flights a week in July 2026. The 1,557-mile flight takes about 3h 26m gate to gate.
- Distance
- 1,557 mi · 2,506 km
- Flight time
- 3h 26m
- Airlines
- 1
- Seats filled
- 83%
Airlines flying SAN to STL
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 9 | Boeing 737 MAX 8, Boeing 737-700 / MAX 7, Boeing 737-800 | 65,099 | 3h 26m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SAN to STL flight schedule
1 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 12:25pm and the last at 12:25pm. 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 3471Southwest Airlines | 12:25pm | 6:00pm | 28 | 29% |
Is SAN to STL on time?
From September 2025 to August 2026, 72% of 470 flights arrived within 15 minutes of schedule and 0.2% were cancelled. Flights leaving around 6am were the most punctual (92%), those around 1pm the least (51%). Most delay time was caused by late-arriving aircraft (60%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 470 | 72% | 16 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 |
|---|---|---|---|
| 6am to 7am | 39 | 92% | |
| 7am to 8am | 65 | 86% | |
| 8am to 9am | 34 | 91% | |
| 9am to 10am | 21 | 86% | |
| 10am to 11am | 35 | 88% | |
| 11am to 12pm | 48 | 73% | |
| 12pm to 1pm | 54 | 52% | |
| 1pm to 2pm | 114 | 51% | |
| 6pm to 7pm | 44 | 68% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 36 | 4,909 | |
| September 2025 | 34 | 4,309 | |
| October 2025 | 57 | 6,804 | |
| November 2025 | 48 | 6,597 | |
| December 2025 | 46 | 5,890 | |
| January 2026 | 34 | 4,724 | |
| February 2026 | 35 | 4,643 | |
| March 2026 | 39 | 5,956 | |
| April 2026 | 36 | 4,912 | |
| May 2026 | 37 | 5,247 | |
| June 2026 | 43 | 6,700 | |
| July 2026 | 41 | 6,092 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.