$82 Cheap Flights from Boston (BOS) to St. Louis (STL)

View $82 flight on Fri, Nov 14, 2025Opens in a new window

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

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Cheap Flights from Boston to St. Louis (BOS-STL)

Prices were available within the past 7 days and start at $82 for one-way flights and $178 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Oct 31 - Tue, Nov 4
BOS
Boston
STL
St. Louis
$178 Roundtrip, found 20 hours ago
$178
Roundtrip
found 20 hours ago
Select Frontier Airlines flight, departing Fri, Oct 31 from Boston to St. Louis, returning Tue, Nov 4, priced at $178 found 20 hours ago
Spirit Airlines
Sat, Oct 18 - Tue, Oct 21
BOS
Boston
STL
St. Louis
$193 Roundtrip, just found
$193
Roundtrip
just found
Select Spirit Airlines flight, departing Sat, Oct 18 from Boston to St. Louis, returning Tue, Oct 21, priced at $193 just found
Frontier Airlines
Fri, Nov 7 - Thu, Nov 13
BOS
Boston
STL
St. Louis
$194 Roundtrip, found 16 hours ago
$194
Roundtrip
found 16 hours ago
Select Frontier Airlines flight, departing Fri, Nov 7 from Boston to St. Louis, returning Thu, Nov 13, priced at $194 found 16 hours ago
Spirit Airlines
Sat, Oct 25 - Thu, Oct 30
BOS
Boston
STL
St. Louis
$209 Roundtrip, found 9 hours ago
$209
Roundtrip
found 9 hours ago
Select Spirit Airlines flight, departing Sat, Oct 25 from Boston to St. Louis, returning Thu, Oct 30, priced at $209 found 9 hours ago
Frontier Airlines
Fri, Nov 7 - Sun, Nov 9
BOS
Boston
STL
St. Louis
$210 Roundtrip, just found
$210
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Nov 7 from Boston to St. Louis, returning Sun, Nov 9, priced at $210 just found
American Airlines
Tue, Oct 7 - Tue, Oct 14
BOS
Boston
STL
St. Louis
$217 Roundtrip, found 4 hours ago
$217
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Tue, Oct 7 from Boston to St. Louis, returning Tue, Oct 14, priced at $217 found 4 hours ago
Frontier Airlines
Fri, Oct 31 - Wed, Nov 5
BOS
Boston
STL
St. Louis
$220 Roundtrip, found 18 hours ago
$220
Roundtrip
found 18 hours ago
Select Frontier Airlines flight, departing Fri, Oct 31 from Boston to St. Louis, returning Wed, Nov 5, priced at $220 found 18 hours ago
Spirit Airlines
Sat, Oct 25 - Sun, Oct 26
BOS
Boston
STL
St. Louis
$224 Roundtrip, found 5 hours ago
$224
Roundtrip
found 5 hours ago
Select Spirit Airlines flight, departing Sat, Oct 25 from Boston to St. Louis, returning Sun, Oct 26, priced at $224 found 5 hours ago
United
Sat, Jan 24 - Sat, Jan 31
BOS
Boston
STL
St. Louis
$241 Roundtrip, found 19 hours ago
$241
Roundtrip
found 19 hours ago
Select United flight, departing Sat, Jan 24 from Boston to St. Louis, returning Sat, Jan 31, priced at $241 found 19 hours ago
Delta
Sat, Oct 4 - Tue, Oct 14
BOS
Boston
STL
St. Louis
$245 Roundtrip, just found
$245
Roundtrip
just found
Select Delta flight, departing Sat, Oct 4 from Boston to St. Louis, returning Tue, Oct 14, priced at $245 just found

Find the cheapest month to fly from Boston (BOS) to St. Louis (STL)

February is typically the cheapest month to fly

From $129 - $420 per traveler.

Graph displaying average flight prices per month

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $357
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $357
Flights from Boston (BOS) to St. Louis (STL)
Origin airport
Logan Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$178
Distance
1043 mi
Average flight time
1 hour 59 mins

Boston to St. Louis Flights

The cheapest times to fly from Boston to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Boston to St. Louis are during the month of October. You can find some of the cheapest flights from Boston to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Boston to St. Louis

Sunday is one of the best days to book for cheap flights from Boston to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Boston to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Boston to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $82 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Boston to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Boston to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL) cost?
Lock in a cheap one-way flight from $82 or cheap return flight from $178 from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from BOS to STL is October, when there's less demand. Off-peak months are usually when you'll find cheap fares for travel between these airports.
Which airlines fly direct from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
Hop on a direct flight with American Airlines and fly straight from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL).
What is the cheapest airline that flies from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
While prices may vary depending on when you travel, American Airlines and Southwest Airlines are popular options for flights between Logan Intl. Airport (BOS) and Lambert-St. Louis Intl. Airport (STL). You can also compare carriers on Expedia and use the "Sort by" filter to find the cheapest ticket for your BOS to STL flight.
How many flights per day from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
When jetting out of Logan Intl. Airport (BOS), you'll have your pick from an average of 2 daily direct flights to Lambert-St. Louis Intl. Airport (STL).
What are the most popular departure times for flights from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
More people fly between BOS and STL at 6 AM than at any other time of day. Looking for a quieter experience? Travel outside of rush hours and it's possible you'll save on your ticket as well.
What day of the week has the most flights from BOS to STL?
Sunday offers the most flights from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL). Consider jetting off on this day and you'll have a greater chance of finding a departure that fits your itinerary.
What is the earliest flight from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
Catch the earliest flight at around 6:15AM UTC-5, departing from Logan Intl. Airport (BOS). You'll be in the air for around 3h 15m, landing at Lambert-St. Louis Intl. Airport (STL) at approximately 8:30AM UTC-6.
How long does it take to fly from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
The average flight time from BOS to STL is 3 hours and 18 minutes, covering a distance of 1,050 mi.
What is the best time to fly from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL) route, fly before 3 PM. Flights after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for St. Louis from Logan Intl. Airport (BOS)?
If you're on a direct flight from Logan Intl. Airport (BOS) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Waiting until just before your trip to book a ticket from BOS to STL often results in higher prices. While you might find some last-minute offers, they're not always guaranteed. Be flexible with your itinerary to maximize your chances of scoring a bargain.
Is it cheaper to book a BOS to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a BOS to STL flight and hotel package with Expedia could lead to significant savings. Better yet, having it all in one place takes the hassle out of planning your trip. Just pick your flights and choose from our wide range of stays, then tailor your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Logan Intl. Airport (BOS) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can cancel or reschedule your BOS to STL flight. However, there may be additional fees, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you'd like further information, go to our Customer Service portal.

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*Available to One Key members.