CA $158 Cheap Flights from St. Louis (STL) to Boston (BOS)

View CA $158 flight on Sat, Sep. 27, 2025Opens in a new window

Popular airlines from Lambert-St. Louis International Airport (STL) to Logan International Airport (BOS)

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Cheap flights from St. Louis (STL) to Boston (BOS)

Prices were available within the past 7 days and start at CA $158 for one-way flights and CA $431 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Thu, Aug. 21 - Mon, Aug. 25
STL
St. Louis
BOS
Boston
CA $431 Roundtrip, found 5 days ago
CA $431
Roundtrip
found 5 days ago
Select Spirit Airlines flight, departing Thu, Aug. 21 from St. Louis to Boston, returning Mon, Aug. 25, priced at CA $431 found 5 days ago
Flight from St. Louis to Boston (STL - BOS) route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Logan Intl.
Roundtrip price
CA $430
Distance
1669 km
Average flight time
3 hours 38 mins

St. Louis to Boston Flights

The easy way to book your flights from St. Louis to Boston 

With Expedia, it’s simple to find and book flights to Boston from St. Louis whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Logan Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from St. Louis to Boston today, tomorrow, or this week.  

 

Save dollars with cheap flights from Lambert-St. Louis Intl., STL to Logan Intl., BOS 

Sort your search results by price to find great deals on your flight from St. Louis to Boston—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Boston from St. Louis currently is just CA $431 rising to CA $487.  

Here are more money-saving tips: 

  • Fly in August when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Boston  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to Boston from St. Louis 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Boston with Expedia today.

Frequently asked questions

How much is a flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport?
If you're travelling between STL and BOS, round-trip flights start from CA $431. This figure is based on airfares listed within the last 7 days on Expedia for flights departing within the next year, so don't delay. Book now and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Lambert Field to BOS?
This can vary between air carriers, as each one has its own set of terms and conditions. Visit the Customer Service Portal, where you'll find easy-to-follow instructions on how to cancel your flight online.
How do I find cheap flights from STL to Logan Intl. Airport that have flexible change policies?
Flights from Lambert Field to BOS with flexible change policies are available with many airlines. Simply use our "No change fees" filter when searching. You'll only need to cover the fare difference, with no extra fees to worry about.
How many hours is the flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport?
The flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS) is 5 hours and 50 minutes. You'll be lucky to finish an entire movie before touchdown!
How far is the flight from STL to Logan Intl. Airport?
It's around 1,700 kilometres between St. Louis and Boston, so you'll be up in the air for a while. Keep yourself entertained by packing things like playing cards (if you're travelling with friends) or the latest bestseller.
Which airlines fly direct from Lambert Field to Logan Intl. Airport (BOS)?
A popular airline that flies from Lambert Field to Logan Intl. Airport (BOS) is Southwest Airlines (WN). It offers 47 flights monthly. American Airlines (AA) is also worth checking out. It offers 43 flights per month. Between these two airlines, you'll be able to find a great deal from St. Louis to Boston.
Are STL to Logan Intl. Airport (BOS) flight tickets cheaper when they're purchased at the last minute?
Flight prices always go up and down, so not always. While last-minute flight deals between STL and BOS are possible, it also makes sense to monitor prices well before you fly. In fact, some air carriers advertise their prices up to a year before the departure date. Expedia is constantly updating the best bargains around, so keep checking back and be ready to lock in your seat when the price is low.

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