St Louis (STL) to Baltimore (BWI) flights
Southwest Airlines flies nonstop from St. Louis Lambert International Airport to Baltimore/Washington International Thurgood Marshall Airport, with about 27 flights a week in July 2026. The 738-mile flight takes about 1h 53m gate to gate.
- Distance
- 738 mi · 1,188 km
- Flight time
- 1h 53m
- Airlines
- 1
- Seats filled
- 62%
Airlines flying STL to BWI
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 27 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8, Boeing 737-800 | 125,660 | 1h 53m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STL to BWI flight schedule
6 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 6:05am and the last at 6:50pm. 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 3811Southwest Airlines | 6:05am | 9:10am | 28 | 96% |
| WN 3812Southwest Airlines | 11:40am | 2:40pm | 24 | 96% |
| WN 3813Southwest Airlines | 1:40pm | 4:40pm | 16 | 69% |
| WN 332Southwest Airlines | 4:15pm | 7:15pm | 12 | 55% |
| WN 1254Southwest Airlines | 4:30pm | 7:30pm | 8 | n/a |
| WN 3814Southwest Airlines | 6:50pm | 9:50pm | 20 | 55% |
Is STL to BWI on time?
From September 2025 to August 2026, 79% of 1,271 flights arrived within 15 minutes of schedule and 1.3% were cancelled. Flights leaving around 5am were the most punctual (96%), those around 7pm the least (60%). Most delay time was caused by late-arriving aircraft (56%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 1,271 | 79% | 13 min | 1.3% |
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 |
|---|---|---|---|
| 5am to 6am | 189 | 96% | |
| 6am to 7am | 154 | 94% | |
| 7am to 8am | 26 | 92% | |
| 9am to 10am | 112 | 89% | |
| 11am to 12pm | 68 | 87% | |
| 1pm to 2pm | 90 | 74% | |
| 2pm to 3pm | 51 | 80% | |
| 4pm to 5pm | 108 | 65% | |
| 5pm to 6pm | 78 | 66% | |
| 6pm to 7pm | 116 | 66% | |
| 7pm to 8pm | 90 | 60% | |
| 8pm to 9pm | 108 | 61% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 127 | 12,890 | |
| September 2025 | 117 | 11,695 | |
| October 2025 | 109 | 12,260 | |
| November 2025 | 107 | 10,126 | |
| December 2025 | 100 | 10,212 | |
| January 2026 | 71 | 5,627 | |
| February 2026 | 73 | 5,645 | |
| March 2026 | 110 | 10,753 | |
| April 2026 | 107 | 9,897 | |
| May 2026 | 113 | 11,483 | |
| June 2026 | 115 | 12,106 | |
| July 2026 | 120 | 12,966 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.