$102 Cheap Flights from St. Louis (STL) to Boston (BOS)

View $102 flight on Mon, Jul 21, 2025Opens in a new window

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Find available prices by choosing your travel dates.

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

Prices were available within the past 7 days and start at $102 for one-way flights and $196 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Jul 10 - Tue, Jul 15
STL
St. Louis
BOS
Boston
$196 Roundtrip, found 2 hours ago
$196
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Thu, Jul 10 from St. Louis to Boston, returning Tue, Jul 15, priced at $196 found 2 hours ago
American Airlines
Thu, Sep 25 - Tue, Sep 30
STL
St. Louis
BOS
Boston
$197 Roundtrip, found 1 day ago
$197
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from St. Louis to Boston, returning Tue, Sep 30, priced at $197 found 1 day ago
Delta
Tue, May 6 - Thu, Jun 5
STL
St. Louis
BOS
Boston
$226 Roundtrip, found 1 day ago
$226
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, May 6 from St. Louis to Boston, returning Thu, Jun 5, priced at $226 found 1 day ago
American Airlines
Wed, May 21 - Sat, May 24
STL
St. Louis
BOS
Boston
$227 Roundtrip, found 1 hour ago
$227
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Wed, May 21 from St. Louis to Boston, returning Sat, May 24, priced at $227 found 1 hour ago
Frontier Airlines
Thu, May 29 - Mon, Jun 2
STL
St. Louis
BOS
Boston
$228 Roundtrip, found 1 day ago
$228
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, May 29 from St. Louis to Boston, returning Mon, Jun 2, priced at $228 found 1 day ago
Delta
Wed, Jun 11 - Wed, Jun 18
STL
St. Louis
BOS
Boston
$234 Roundtrip, found 3 hours ago
$234
Roundtrip
found 3 hours ago
Select Delta flight, departing Wed, Jun 11 from St. Louis to Boston, returning Wed, Jun 18, priced at $234 found 3 hours ago
Spirit Airlines
Thu, May 29 - Thu, Jun 5
STL
St. Louis
BOS
Boston
$235 Roundtrip, found 1 day ago
$235
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Thu, May 29 from St. Louis to Boston, returning Thu, Jun 5, priced at $235 found 1 day ago
Spirit Airlines
Sun, May 25 - Tue, May 27
STL
St. Louis
BOS
Boston
$235 Roundtrip, found 6 hours ago
$235
Roundtrip
found 6 hours ago
Select Spirit Airlines flight, departing Sun, May 25 from St. Louis to Boston, returning Tue, May 27, priced at $235 found 6 hours ago
Delta
Wed, Apr 30 - Sat, May 3
STL
St. Louis
BOS
Boston
$237 Roundtrip, found 22 hours ago
$237
Roundtrip
found 22 hours ago
Select Delta flight, departing Wed, Apr 30 from St. Louis to Boston, returning Sat, May 3, priced at $237 found 22 hours ago
United
Wed, Jun 18 - Tue, Jun 24
STL
St. Louis
BOS
Boston
$254 Roundtrip, found 5 hours ago
$254
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Jun 18 from St. Louis to Boston, returning Tue, Jun 24, priced at $254 found 5 hours ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS) cost?
You can pick up cheap return fares starting from $303 from Lambert-St. Louis Intl. Airport (STL) to Logan Intl. Airport (BOS). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a American Airlines and Southwest Airlines flight leaving STL on May 21 2025 and touching down at BOS. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from STL to BOS?
The cheapest flights from STL to BOS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
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).
What is the cheapest airline that flies from STL to BOS?
Journey from STL to BOS with Southwest Airlines. This airline currently has the cheapest one-way fare for this route, starting at $152. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STL on June 10 2025. Prices were last updated on April 24 2025 and have not changed since.
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.
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