Boston (BOS) – St. Louis (STL)
- Distance
- 1,684 km
- 1,047 mi · 909 nm
- Flight time
- 3 h 1 min / 2 h 30 min
- Average gate to gate: BOS → STL / back
- Time difference
- 1 h
- CO2 per passenger
- 211 kg
- One way, economy, incl. RF (125 kg CO2 only)
- Passengers / year
- 323,144
- Aug 2025 – Jul 2026 · +0.7%
- Flights / week
- 61
- Both directions, average
- Seats filled
- 78%
- 412,955 seats a year
- Airlines nonstop
- 3
- WN, MQ, YX
Traffic: U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service), Aug 2025 – Jul 2026. Distance: WGS-84 ellipsoid. CO2: UK DESNZ 2026 factors. Sources
The way there
- Heading from BOS
- 263°
- Heading from STL
- 70°
- Halfway point
- 40.96, -80.95
- Great-circle km
- 1,680 km (sphere, for EU261)
- In the air BOS → STL
- 2 h 37 min
- In the air STL → BOS
- 2 h 11 min
- Clocks
- St. Louis is 1 h behind Boston
The estimate for a route without real times is 2 h 45 min; how it is worked out is on Sources.
Show as a table
| Month | Passengers |
|---|---|
| Aug 2025 | 33,179 |
| Sep 2025 | 29,660 |
| Oct 2025 | 34,173 |
| Nov 2025 | 29,311 |
| Dec 2025 | 29,463 |
| Jan 2026 | 15,281 |
| Feb 2026 | 13,377 |
| Mar 2026 | 20,922 |
| Apr 2026 | 25,938 |
| May 2026 | 29,207 |
| Jun 2026 | 30,317 |
| Jul 2026 | 32,316 |
Show as a table
| Month | Flights |
|---|---|
| Aug 2025 | 290 |
| Sep 2025 | 281 |
| Oct 2025 | 297 |
| Nov 2025 | 279 |
| Dec 2025 | 291 |
| Jan 2026 | 192 |
| Feb 2026 | 182 |
| Mar 2026 | 233 |
| Apr 2026 | 268 |
| May 2026 | 283 |
| Jun 2026 | 286 |
| Jul 2026 | 285 |
Airlines flying BOS–STL nonstop
| Airline | Flights / week | Share of passengers |
|---|---|---|
| WNSouthwest Airlines | 36 | 77% |
| MQEnvoy Air | 15 | 14% |
| YXRepublic Airline | 11 | 9% |
Both directions, Aug 2025 – Jul 2026. Airlines with at least one flight a month. U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service). Sources
Aircraft on this route
- Embraer ERJ-175 · 1,314 flights
- Boeing B737 Max 800 · 893 flights
- Boeing 737-800 · 646 flights
- Boeing 737-700/700LR/Max 7 · 308 flights
- Embraer-Emb-170 · 3 flights
- A200-100 BD-500-1A10 · 1 flight
- Airbus Industrie A319 · 1 flight
- A220-300 BD-500-1A11 · 1 flight
Also carried: 287 tonnes of freight and 0 tonnes of mail a year (passenger and cargo flights).
Punctuality
- On time
- 72.9%
- Arrived within 15 min of schedule
- Average delay
- 19 min
- Late arrivals count, early ones as 0
- Cancelled
- 1.6%
- Flights counted
- 3,223
- Aug 2025 – Jul 2026
| Airline | On time | Average delay |
|---|---|---|
| WNSouthwest Airlines | 69.1% | 20 min |
| MQEnvoy Air | 79.3% | 16 min |
| YXRepublic Airline | 76.7% | 18 min |
Delay minutes by cause: airline 20% · aircraft arriving late 54% · air traffic system 21% · weather 3% · security 1%.
Both directions, Aug 2025 – Jul 2026. BTS Reporting Carrier On-Time Performance (US domestic flights of the larger US airlines). Sources
What passengers paid
- Average fare, Q1 2026
- $327
- One way, all cabins
- Average over a year
- $304
- Q2 2025 – Q1 2026
- Largest airline
- Southwest Airlines
- 47% of passengers · $313
- Lowest-fare airline
- Southwest Airlines
- 47% of passengers · $313
History, not a price to book: what the average passenger paid per one-way trip in each quarter (Q2 2025 $296 · Q3 2025 $289 · Q4 2025 $313 · Q1 2026 $327).
Fare outlook, Q1 2027: about $334, likely $289–$381
The average fare paid we expect a year after Q1 2026, the newest DOT quarter. On this route, past forecasts made this way fell inside the range 90% of the time over 21 quarters (median error 5.5%). An estimate from US DOT data: not a price you can book, not a guarantee, not advice on when to buy. How the outlook works
Cheapest quarter on this route: Q1, typically 3% below the year's average (9 years of DOT data, without 2020–21).
U.S. DOT Consumer Airfare Report, Table 1a (airline ticket sample, US domestic airport pairs). Sources
Delay compensation (EU261 / UK261)
Measured by great-circle distance: 1,680 km.
Neither EU261 nor UK261 covers this route: it neither starts nor ends in the EU, EEA, Switzerland or the UK. Other countries have their own rules (for example Canada's APPR or Brazil's ANAC rules).
Also owed for a cancellation with less than 14 days' notice or denied boarding. Not owed for extraordinary circumstances. On a connection, the distance to the final destination counts. From 23 October 2027 the EU's Regulation 2026/2202 applies; it keeps these amounts (what changes in 2027). Information, not legal advice.