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Flights from Boston to St Louis, United States
Boston to St Louis Last modified: May 8, 2025 15:33 -04:00
We've scanned 122,775,531 round trip itineraries and found the cheapest flights to St Louis. Major Airlines & United frequently offer the best deals to St Louis flights, or select your preferred carrier below to see the cheapest days to fly.
Where To Buy Cheap Flights from Boston to St Louis?
The best way to find a great deal on airfare is to search multiple sites. When you run a search on FareCompare, we search multiple sites and fare sources all at once so you don't have to - which is why we think FareCompare is the best place to find cheap tickets. Airlines can adjust prices for tickets from Boston to St Louis based on the day and time that you decide to book your flight. We have collected data from all airlines, and have found that Tuesdays, Wednesdays, and Saturdays are often the best days to book flights. If you'd like to learn more, read our article about the best time to buy airline tickets.
How far in advance should I book tickets from Boston to St Louis?
The chart below shows up-to-date information regarding how far in advance to book your flight from Boston to St Louis.
| Advanced Purchase | Non Stop | Connecting |
|---|---|---|
| < 7 days | $650 | $508 |
| 7-14 days | $407 | $404 |
| 14-21 days | $303 | $277 |
| 21-30 days | $303 | $277 |
| 30-60 days | $303 | $277 |
| 60-90 days | $303 | $277 |
| 90+ days | $403 | $277 |
Compare Flight Prices from Boston to St Louis by Month
Low priced flights are most commonly available by purchasing between one and three months in advance. International or holiday flights may need to be purchased even further in advance. The chart below shows the cheapest flight prices by month for Boston to St Louis flights.
| Month | Origin | Destination | Carrier | Depart Date | Return Date | Stops | Price |
|---|---|---|---|---|---|---|---|
| April | Boston | St Louis | American | 4/30/25 | 5/12/25 | 0 | $650 |
| May | Boston | St Louis | Major Airlines | 5/20/25 | 5/27/25 | 1 | $277 |
| June | Boston | St Louis | Major Airlines | 6/3/25 | 6/10/25 | 1 | $277 |
Cheap Last Minute Flights from Boston to St Louis
Looking for cheap last minute flights or a weekend getaway? We've got you covered with weekend flight deals from Boston to St Louis. The chart below shows the best last minute deals and cheap flights this weekend we could find.
Next 30 Days
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 27 | 28 | 29 | 30 | 1 | 2 | 3 |
| $705 | ||||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| $705 | $602 | |||||
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| $602 | $389 | |||||
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| $389 | $293 | |||||
| 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| $293 | $373 | |||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| $373 | ||||||
Connecting Flights vs Direct Flights from Boston to St Louis
Flights between some cities may be significantly cheaper if you choose a multi-stop airline ticket. Although these connecting flights sacrifice some convenience, on average, travelers save 20%-60% when they choose to fly multi-stop versus a direct flight.
The average price for connecting flights from Boston to St Louis is $404.
The average price for direct flights from Boston to St Louis is $418.
One Way Flights vs Round Trip Flights from Boston to St Louis
We have found that there is often no price difference between buying a round trip flight versus a one way flight. Increased flexibility is the main benefit when it comes to buying a one way flight from Boston to St Louis. However, booking a round trip flight can be a simpler process. You can compare round trip and one way flights by using our flight comparison.
The average price for one way flights from Boston to St Louis is $211.
The average price for round trip flights from Boston to St Louis is $401.
Farecompare Research Tools
FareCompare's Flight Schedule Search Tool helps you find information about airline schedule filings, including flight numbers, depart times, and travel distance.
Cheap Domestic Flights from Boston - BOS Last modified: May 8, 2025 15:33 -04:00
| Flights | Lowest Price |
| Boston to Chicago | $117 |
| Boston to Atlanta | $118 |
Cheap Domestic Flights to St Louis - STL Last modified: May 8, 2025 15:33 -04:00
Cheap International Flights to St Louis - STL Last modified: May 8, 2025 15:33 -04:00
| Flights | Lowest Price |
| New York City to London, United Kingdom | $407 |
| New York City to Toronto | $182 |
