Your next trip, last seen at €310
When to fly
Explore datesFind the dates that work for you
The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- Lowest observed
- €310, departing 30 Oct 2026 (Last checked: 27 Oct 2026)One-way fareCheck live prices for this route
- Airlines seen
- Frontier Airlines, JetBlue, Southern Airways Express, United Airlines
- Typical journey time
- 14h 35m
- Non-stop
- Yes
About this route
Explore the fares we observed from St Louis to Boston. Prices move often, so pick your dates to see the latest options.
- Route distance
- 1,667 km
- Typical journey time
- 14h 35m
- Alternative airports
- SUS, PSM
Route-level information; individual journeys vary.
Published schedules report non-stop service with Southwest Airlines. Check current timetables.
A clearer picture of your fare
Airport to city: straight-line distance
- St. Louis Lambert International Airport (STL) → St Louis, city gazetteer reference point (38.6270, -90.1994): ≈ 20 km.
- Portsmouth International Airport at Pease (PSM) → Boston, city gazetteer reference point (42.3584, -71.0598): ≈ 82 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest one-way fare we saw per airline
Cheapest airline from St Louis to Boston: Frontier Airlines, from €116 (checked 20 Oct 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Frontier Airlines | €116Dec 2, 2026 | 45 |
| United Airlines | €193Dec 17, 2026 | 26 |
| Southern Airways Express | €220Jan 5, 2027 | 10 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from St Louis to Boston?
The lowest fare Routavio has observed is €310, found on 27 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from St Louis to Boston?
In our observations October 2026 is the cheapest month so far, at €310.
Are there direct flights from St Louis to Boston?
Yes. Published schedules report non-stop flights on this route with Southwest Airlines.
Which airlines fly from St Louis to Boston?
Routavio has seen these carriers on the route: Frontier Airlines, JetBlue, Southern Airways Express, United Airlines.
How long does the flight from St Louis to Boston take?
Across the 88 fares Routavio observed, the average journey time is 14h 56m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
Which airline has the lowest fare from St Louis to Boston?
Cheapest airline from St Louis to Boston: Frontier Airlines, from €116 (checked 20 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide
Keep exploring
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Recently observed fares. Prices may change.
Last checked: 27 Oct 2026