$79 Cheap Flights from St. Louis (STL) to Boston (BOS)

View $79 flight on Thu, Nov 20, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $79 for one-way flights and $173 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Dec 11 - Fri, Dec 12
STL
St. Louis
BOS
Boston
$173 Roundtrip, found 2 days ago
$173
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Dec 11 from St. Louis to Boston, returning Fri, Dec 12, priced at $173 found 2 days ago
Southwest Airlines
Thu, Dec 11 - Mon, Dec 15
STL
St. Louis
BOS
Boston
$203 Roundtrip, found 2 days ago
$203
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Thu, Dec 11 from St. Louis to Boston, returning Mon, Dec 15, priced at $203 found 2 days ago
American Airlines
Wed, Dec 24 - Wed, Dec 31
STL
St. Louis
BOS
Boston
$203 Roundtrip, found 1 day ago
$203
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Dec 24 from St. Louis to Boston, returning Wed, Dec 31, priced at $203 found 1 day ago
American Airlines
Mon, Jan 19 - Tue, Jan 20
STL
St. Louis
BOS
Boston
$213 Roundtrip, found 3 days ago
$213
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Jan 19 from St. Louis to Boston, returning Tue, Jan 20, priced at $213 found 3 days ago
Spirit Airlines
Thu, Jan 29 - Sat, Jan 31
STL
St. Louis
BOS
Boston
$221 Roundtrip, found 2 hours ago
$221
Roundtrip
found 2 hours ago
Select Spirit Airlines flight, departing Thu, Jan 29 from St. Louis to Boston, returning Sat, Jan 31, priced at $221 found 2 hours ago
American Airlines
Thu, Dec 4 - Fri, Dec 12
STL
St. Louis
BOS
Boston
$227 Roundtrip, found 2 days ago
$227
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Dec 4 from St. Louis to Boston, returning Fri, Dec 12, priced at $227 found 2 days ago
Spirit Airlines
Sun, Feb 8 - Wed, Feb 18
STL
St. Louis
BOS
Boston
$229 Roundtrip, found 4 days ago
$229
Roundtrip
found 4 days ago
Select Spirit Airlines flight, departing Sun, Feb 8 from St. Louis to Boston, returning Wed, Feb 18, priced at $229 found 4 days ago
American Airlines
Mon, Nov 24 - Thu, Dec 4
STL
St. Louis
BOS
Boston
$234 Roundtrip, found 4 days ago
$234
Roundtrip
found 4 days ago
Select American Airlines flight, departing Mon, Nov 24 from St. Louis to Boston, returning Thu, Dec 4, priced at $234 found 4 days ago
Spirit Airlines
Sun, Feb 1 - Wed, Feb 18
STL
St. Louis
BOS
Boston
$234 Roundtrip, found 3 days ago
$234
Roundtrip
found 3 days ago
Select Spirit Airlines flight, departing Sun, Feb 1 from St. Louis to Boston, returning Wed, Feb 18, priced at $234 found 3 days ago
United
Wed, Dec 3 - Sun, Dec 7
STL
St. Louis
BOS
Boston
$237 Roundtrip, found 7 hours ago
$237
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Dec 3 from St. Louis to Boston, returning Sun, Dec 7, priced at $237 found 7 hours ago

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

February is typically the cheapest month to fly

From $135 - $446 per traveler.

Alternative airports near Boston

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

Select flight to Logan Intl. BOS. Cheapest and Closest option available. Average driving time to city center is 7 minutes. Flights from $412
BOS
Logan Intl.
CheapestClosest
Average driving time to city center7 min
Flights from $412

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS) cost?
Lock in a cheap one-way flight from $79 or cheap return flight from $173 from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS) 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 Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
December is the least expensive month to fly from STL to BOS. Traveling outside of peak seasons is often the key to finding a great deal.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
Catch a direct flight with Southwest Airlines and fly straight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS).
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
Each day, an average of 3 nonstop flights take off from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS). Select the departure time that best suits your plans.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
The 9 AM departures from STL to BOS are the busiest. They can also be more expensive. If you want to save on your trip, book during off-peak hours.
What day of the week has the most flights from STL to BOS?
Travel on a Sunday if you're searching for the largest selection of flights from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
The first flight of the day leaving from Lambert-St. Louis Intl. Airport (STL) is at around 8:30AM UTC-6. Board this plane and you'll arrive at Logan Intl. Airport (BOS) at approximately 12:05PM UTC-5. The total time in the air is 2h 35m.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
The average flight time from STL to BOS is 2 hours and 36 minutes, covering a total distance of 1,050 mi.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
Choose a flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Departures later than this have a 22% higher chance of being canceled, on average.**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 Boston from Lambert-St. Louis Intl. Airport (STL)?
Browse your flight options from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS). This is the only Boston airport you can arrive at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS) last-minute?
Last-minute bookings from STL to BOS are generally more expensive. To secure the cheapest rates, start searching for flights well in advance. That being said, if you're flexible with your travel dates, you may find a cheap fare right before you leave.
Is it cheaper to book a STL to BOS flight and hotel package?
Securing a STL to BOS flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Pick from our extensive range of hotels and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS)?
If you booked your STL to BOS flight within the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more information.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Logan Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$173
Distance
1043 mi
Average flight time
3 hours 34 mins

Book with confidence

St. Louis to Boston Flights

The cheapest times to fly from St. Louis to Boston

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 St. Louis to Boston are during the month of December. You can find some of the cheapest flights from St. Louis to Boston with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Boston: 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 St. Louis to Boston

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 St. Louis to Boston in 2025. You can also book with separate airlines for your outbound and return journeys, from $79 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 St. Louis to Boston 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 St. Louis to Boston 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.

 

St. Louis to Boston Flights

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*Available to One Key members.