$86 Cheap Flights from Boston (BOS) to St. Louis (STL)

View $86 flight on Sun, May 24, 2026Opens 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 $86 for one-way flights and $200 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sun, May 31 - Tue, Jun 9
BOS
Boston
STL
St. Louis
$200 Roundtrip, found 9 hours ago
$200
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sun, May 31 from Boston to St. Louis, returning Tue, Jun 9, priced at $200 found 9 hours ago
Frontier Airlines
Sun, May 24 - Sun, May 31
BOS
Boston
STL
St. Louis
$201 Roundtrip, found 22 hours ago
$201
Roundtrip
found 22 hours ago
Select Frontier Airlines flight, departing Sun, May 24 from Boston to St. Louis, returning Sun, May 31, priced at $201 found 22 hours ago
Frontier Airlines
Thu, Jun 4 - Sat, Jun 13
BOS
Boston
STL
St. Louis
$209 Roundtrip, found 9 hours ago
$209
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Thu, Jun 4 from Boston to St. Louis, returning Sat, Jun 13, priced at $209 found 9 hours ago
Frontier Airlines
Tue, Jul 21 - Wed, Jul 22
BOS
Boston
STL
St. Louis
$210 Roundtrip, just found
$210
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Jul 21 from Boston to St. Louis, returning Wed, Jul 22, priced at $210 just found
Frontier Airlines
Tue, Jun 9 - Wed, Jun 10
BOS
Boston
STL
St. Louis
$215 Roundtrip, just found
$215
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Jun 9 from Boston to St. Louis, returning Wed, Jun 10, priced at $215 just found
Frontier Airlines
Thu, Jun 4 - Sat, Jun 13
BOS
Boston
STL
St. Louis
$219 Roundtrip, found 9 hours ago
$219
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Thu, Jun 4 from Boston to St. Louis, returning Sat, Jun 13, priced at $219 found 9 hours ago
Southwest Airlines
Tue, Jun 9 - Wed, Jun 17
BOS
Boston
STL
St. Louis
$305 Roundtrip, found 12 hours ago
$305
Roundtrip
found 12 hours ago
Select Southwest Airlines flight, departing Tue, Jun 9 from Boston to St. Louis, returning Wed, Jun 17, priced at $305 found 12 hours ago
American Airlines
Tue, Jun 23 - Tue, Jun 30
BOS
Boston
STL
St. Louis
$305 Roundtrip, found 15 hours ago
$305
Roundtrip
found 15 hours ago
Select American Airlines flight, departing Tue, Jun 23 from Boston to St. Louis, returning Tue, Jun 30, priced at $305 found 15 hours ago
United
Tue, Sep 29 - Wed, Sep 30
BOS
Boston
STL
St. Louis
$332 Roundtrip, found 2 days ago
$332
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep 29 from Boston to St. Louis, returning Wed, Sep 30, priced at $332 found 2 days ago
Delta
Tue, Jun 23 - Wed, Jun 24
BOS
Boston
STL
St. Louis
$337 Roundtrip, just found
$337
Roundtrip
just found
Select Delta flight, departing Tue, Jun 23 from Boston to St. Louis, returning Wed, Jun 24, priced at $337 just found

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 $280
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $280

Frequently asked questions

How much does a flight from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights and cheap return flights from $200 Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights typically cost between $186 and $920, and return flights often range between $396 and $1586. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
September is the cheapest month to fly from Boston (BOS) to St. Louis (STL), with average round-trip fares around $394. This is about 11% lower than the average price throughout the year, as September usually sees a decline in travel demand after the summer. Other economical months to consider are February and August.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
American Airlines offers around 18 weekly direct flights from BOS to STL.
What is the cheapest airline that flies from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Southwest Airlines is one of the cheapest airlines offering nonstop flights from Boston (BOS) to St. Louis (STL), with round-trip tickets starting from around $191. This is a great option if you're looking for a direct route. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Boston, MA (BOS) to St. Louis, MO (STL) will differ from traveler to traveler. If you like to fly early, American Airlines offers early morning flights. If price is the most important factor, American Airlines typically offers the lowest fares. American Airlines offers the most daily flights from Boston to St. Louis, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
When flying from Boston, MA (BOS) to St. Louis, MO (STL), consider traveling in September or August. These months are not only the cheapest, with average return flight prices around $394, but they also provide a good mix of favorable weather and travel options. August is great for summer activities, while September offers a more relaxed atmosphere.*Prices based on flights available on Expedia in the last year.
How many flights per day from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
On average, there are around 5 nonstop flights per day from Logan Intl. (BOS) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.
What is the earliest flight from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Boston (Logan International) to St. Louis (Lambert-St. Louis International) usually departs at around 5:00 AM. This seasonal service is offered by American Airlines and Southern Airways Express, allowing you to arrive in St. Louis early and start your day. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Boston (BOS) to St. Louis (STL) are in the early morning, from 6am to 9am. This time window accounts for about 27% of total traffic. Major carriers like American Airlines and Delta operate during this time, making it a great option for travelers looking to arrive in St. Louis early in the day.
How long does it take to fly from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Direct flights from BOS to STL usually take about 3 hours 20 minutes, traveling roughly 1,044 miles. If you opt for a connecting flight, expect to add around 2 hours 30 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
First class seats are offered on the BOS to STL route. First class cabins are available on:

  • Delta Air Lines
  • American Airlines
  • United Airlines
  • Spirit Airlines

How much is a business class flight from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A direct, return business class ticket from Boston (BOS) to St. Louis (STL) typically costs between $1,061 - $1,574. A non-stop, one-way business class flight is usually around $532 - $1,032. You may also be able to find a cheaper business class journey between Boston to St. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
How do I earn miles on a Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Logan Intl. (BOS)?
From Logan Intl. (BOS), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Portland Intl. (PDX), Baltimore Washington Intl. Thurgood Marshall (BWI), Nashville Intl. (BNA) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Boston, MA (BOS-Logan Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Logan Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$200
Distance
1043 mi
Average flight time
2 hours 6 mins

Book with confidence

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 May. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $86 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.

 

Boston to St. Louis Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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