Boston (BOS) to St Louis (STL) flights
Southwest Airlines, Republic Airline, Envoy Air fly nonstop from Boston Logan International Airport to St. Louis Lambert International Airport, with about 32 flights a week in July 2026. The 1,047-mile flight takes about 3h 1m gate to gate.
- Distance
- 1,047 mi · 1,685 km
- Flight time
- 3h 1m
- Airlines
- 3
- Seats filled
- 77%
Airlines flying BOS to STL
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 20 | Boeing 737 MAX 8, Boeing 737-800, Boeing 737-700 / MAX 7 | 121,191 | 2h 56m |
| Republic Airline | 7 | Embraer E175 | 14,559 | 3h 11m |
| Envoy Air | 5 | Embraer E175, Embraer E170 | 22,333 | 3h 5m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
BOS to STL flight schedule
12 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 5:00am and the last at 6:05pm. 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 4968Southwest Airlines | 5:00am | 6:50am | 12 | 100% |
| WN 3013Southwest Airlines | 5:35am | 7:25am | 8 | n/a |
| AA 3546American Airlines · operated by Envoy Air | 7:09am | 9:13am | 19 | 84% |
| AA 4417American Airlines · operated by Republic Airline | 7:09am | 9:13am | 4 | n/a |
| WN 960Southwest Airlines | 10:45am | 12:35pm | 4 | n/a |
| WN 2550Southwest Airlines | 1:05pm | 2:55pm | 12 | 75% |
| WN 3044Southwest Airlines | 1:10pm | 3:00pm | 12 | 42% |
| WN 155Southwest Airlines | 1:30pm | 3:20pm | 4 | n/a |
| AA 4678American Airlines · operated by Republic Airline | 5:22pm | 7:30pm | 31 | 53% |
| WN 999Southwest Airlines | 5:45pm | 7:40pm | 14 | 79% |
| WN 2076Southwest Airlines | 5:50pm | 7:45pm | 12 | 17% |
| WN 2356Southwest Airlines | 6:05pm | 8:00pm | 4 | n/a |
Is BOS to STL on time?
From September 2025 to August 2026, 75% of 1,617 flights arrived within 15 minutes of schedule and 1.7% were cancelled. Flights leaving around 5am were the most punctual (97%), those around 6pm the least (37%). Most delay time was caused by late-arriving aircraft (60%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 939 | 72% | 18 min | 1% |
| American Airlines | 678 | 79% | 15 min | 2.7% |
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 | 180 | 97% | |
| 6am to 7am | 170 | 91% | |
| 7am to 8am | 246 | 91% | |
| 8am to 9am | 52 | 86% | |
| 9am to 10am | 66 | 79% | |
| 11am to 12pm | 82 | 89% | |
| 12pm to 1pm | 97 | 75% | |
| 1pm to 2pm | 86 | 67% | |
| 2pm to 3pm | 50 | 60% | |
| 3pm to 4pm | 115 | 71% | |
| 4pm to 5pm | 60 | 58% | |
| 5pm to 6pm | 183 | 51% | |
| 6pm to 7pm | 132 | 37% | |
| 7pm to 8pm | 68 | 53% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 145 | 16,720 | |
| September 2025 | 140 | 14,484 | |
| October 2025 | 148 | 17,033 | |
| November 2025 | 141 | 14,936 | |
| December 2025 | 146 | 15,378 | |
| January 2026 | 96 | 6,723 | |
| February 2026 | 91 | 6,466 | |
| March 2026 | 116 | 9,572 | |
| April 2026 | 134 | 12,755 | |
| May 2026 | 141 | 13,442 | |
| June 2026 | 143 | 14,871 | |
| July 2026 | 143 | 15,988 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.