St Louis (STL) to Boston (BOS) flights
Southwest Airlines, Republic Airline, Envoy Air fly nonstop from St. Louis Lambert International Airport to Boston Logan International Airport, with about 32 flights a week in July 2026. The 1,047-mile flight takes about 2h 30m gate to gate.
- Distance
- 1,047 mi · 1,685 km
- Flight time
- 2h 30m
- Airlines
- 3
- Seats filled
- 80%
Airlines flying STL to BOS
| 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 | 126,285 | 2h 28m |
| Republic Airline | 7 | Embraer E175 | 15,780 | 2h 35m |
| Envoy Air | 5 | Embraer E175, Embraer E170 | 22,711 | 2h 33m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STL to BOS flight schedule
11 flight numbers flew this route in August 2026, 2 of them almost daily. The first usually leaves at 7:00am and the last at 8:00pm. 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 4061Southwest Airlines | 7:00am | 10:35am | 12 | 92% |
| AA 3546American Airlines · operated by Envoy Air | 9:44am | 1:29pm | 19 | 74% |
| AA 4417American Airlines · operated by Republic Airline | 9:46am | 1:34pm | 4 | n/a |
| WN 1538Southwest Airlines | 10:25am | 2:00pm | 8 | n/a |
| WN 3657Southwest Airlines | 11:40am | 3:15pm | 4 | n/a |
| WN 2144Southwest Airlines | 1:20pm | 4:55pm | 8 | n/a |
| WN 3808Southwest Airlines | 1:30pm | 5:05pm | 20 | 55% |
| WN 3809Southwest Airlines | 1:50pm | 5:25pm | 4 | n/a |
| WN 982Southwest Airlines | 6:40pm | 10:15pm | 16 | 19% |
| WN 1643Southwest Airlines | 7:00pm | 10:30pm | 12 | 33% |
| AA 4678American Airlines · operated by Republic Airline | 8:00pm | 11:44pm | 31 | 57% |
Is STL to BOS on time?
From September 2025 to August 2026, 67% of 1,616 flights arrived within 15 minutes of schedule and 1.8% were cancelled. Flights leaving around 7am were the most punctual (93%), those around 7pm the least (47%). Most delay time was caused by late-arriving aircraft (52%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 938 | 63% | 23 min | 0.7% |
| American Airlines | 678 | 73% | 24 min | 3.2% |
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 |
|---|---|---|---|
| 7am to 8am | 96 | 93% | |
| 8am to 9am | 70 | 84% | |
| 9am to 10am | 177 | 81% | |
| 10am to 11am | 148 | 82% | |
| 11am to 12pm | 137 | 72% | |
| 12pm to 1pm | 51 | 65% | |
| 1pm to 2pm | 96 | 66% | |
| 2pm to 3pm | 206 | 57% | |
| 3pm to 4pm | 39 | 54% | |
| 5pm to 6pm | 122 | 68% | |
| 6pm to 7pm | 137 | 69% | |
| 7pm to 8pm | 219 | 47% | |
| 8pm to 9pm | 105 | 49% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 145 | 16,459 | |
| September 2025 | 141 | 15,176 | |
| October 2025 | 149 | 17,140 | |
| November 2025 | 138 | 14,375 | |
| December 2025 | 145 | 14,085 | |
| January 2026 | 96 | 8,558 | |
| February 2026 | 91 | 6,911 | |
| March 2026 | 117 | 11,350 | |
| April 2026 | 134 | 13,183 | |
| May 2026 | 142 | 15,765 | |
| June 2026 | 143 | 15,446 | |
| July 2026 | 142 | 16,328 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.