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Cheap flights from Boston to St. Louis from $57

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to St. Louis departing on 1/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Boston to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
4:55 pm - 8:55 pm
BOS
-
STL
5h 00m1 stop
Southwest Logo
8:45 am - 12:20 pm
STL
-
BOS
2h 35mnonstop
$334Southwest
Sat, Jan 10 - Sat, Jan 17
American Airlines Logo
6:30 am - 9:03 am
BOS
-
STL
3h 33mnonstop
American Airlines Logo
11:05 am - 8:45 pm
STL
-
BOS
8h 40m1 stop
$337American Airlines
Thu, Jan 15 - Sat, Jan 17
American Airlines Logo
12:55 pm - 9:15 pm
BOS
-
STL
9h 20m1 stop
American Airlines Logo
2:54 pm - 6:31 pm
STL
-
BOS
2h 37mnonstop
$342American Airlines
Tue, Jan 6 - Sun, Jan 11
Multiple Airlines Logo
3:43 pm - 10:33 pm
BOS
-
STL
7h 50m1 stop
Multiple Airlines Logo
10:42 am - 9:57 am
STL
-
BOS
22h 15m1 stop
$348Multiple Airlines
Thu, Apr 9 - Sun, Apr 12
Southwest Logo
5:50 am - 12:45 pm
BOS
-
STL
7h 55m2 stops
Southwest Logo
2:35 pm - 10:05 pm
STL
-
BOS
6h 30m1 stop
$349Southwest
Wed, Jan 14 - Sun, Jan 18
Southwest Logo
6:25 am - 8:45 am
BOS
-
STL
3h 20mnonstop
Southwest Logo
8:45 am - 12:20 pm
STL
-
BOS
2h 35mnonstop
$351Southwest
Wed, Jan 7 - Sat, Jan 10
American Airlines Logo
12:55 pm - 9:15 pm
BOS
-
STL
9h 20m1 stop
American Airlines Logo
11:37 am - 4:58 pm
STL
-
BOS
4h 21m1 stop
$352American Airlines
Tue, Jan 6 - Sun, Jan 11
Southwest Logo
6:35 am - 8:55 am
BOS
-
STL
3h 20mnonstop
Southwest Logo
5:55 pm - 9:25 pm
STL
-
BOS
2h 30mnonstop
$369Southwest
Fri, Jan 16 - Sun, Jan 18
American Airlines Logo
6:36 am - 1:23 pm
BOS
-
STL
7h 47m1 stop
American Airlines Logo
2:50 pm - 6:29 pm
STL
-
BOS
2h 39mnonstop
$370American Airlines
Mon, Dec 22 - Mon, Dec 22
Southwest Logo
9:30 am - 4:40 pm
BOS
-
STL
8h 10m1 stop
Southwest Logo
5:55 pm - 9:25 pm
STL
-
BOS
2h 30mnonstop
$379Southwest
Fri, Jan 16 - Sun, Jan 18

Southwest flights from Boston to St. Louis

Our best Southwest deals on Boston to St. Louis flight tickets
Southwest
Jan 10
BOS4:55 pmBoston Logan Intl
5h 00m
1 stop
STL8:55 pmLambert-St Louis
Jan 17
STL8:45 amLambert-St Louis
2h 35m
BOS12:20 pmBoston Logan Intl
$334
Find similar
Southwest
Jan 14
BOS5:50 amBoston Logan Intl
7h 55m
2 stops
STL12:45 pmLambert-St Louis
Jan 18
STL2:35 pmLambert-St Louis
6h 30m
1 stop
BOS10:05 pmBoston Logan Intl
$349
Find similar
Southwest
Jan 7
BOS6:25 amBoston Logan Intl
3h 20m
STL8:45 amLambert-St Louis
Jan 10
STL8:45 amLambert-St Louis
2h 35m
BOS12:20 pmBoston Logan Intl
$351
Find similar

United Airlines flights from Boston to St. Louis

Our best United Airlines deals on Boston to St. Louis flight tickets
United Airlines
Jan 7
BOS6:00 amBoston Logan Intl
9h 30m
1 stop
STL2:30 pmLambert-St Louis
Jan 14
STL11:22 amLambert-St Louis
4h 52m
1 stop
BOS5:14 pmBoston Logan Intl
$389
Find similar
United Airlines
Jan 6
BOS10:30 amBoston Logan Intl
11h 43m
1 stop
STL9:13 pmLambert-St Louis
Jan 13
STL9:57 amLambert-St Louis
7h 35m
2 stops
BOS6:32 pmBoston Logan Intl
$394
Find similar
United Airlines
Jan 6
BOS10:30 amBoston Logan Intl
11h 43m
2 stops
STL9:13 pmLambert-St Louis
Jan 13
STL12:44 pmLambert-St Louis
5h 13m
1 stop
BOS6:57 pmBoston Logan Intl
$410
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Boston to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 11, 2025.
Use the filters below to find and compare flights from Boston to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 1/10

4:55 pm-8:55 pm

1 stop5h 00m

Lambert-St Louis

Sat 1/17

8:45 am-12:20 pm

Nonstop2h 35m

$334

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 1/15

6:30 am-9:03 am

Nonstop3h 33m

Lambert-St Louis

Sat 1/17

11:05 am-8:45 pm

1 stop8h 40m

$337

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 1/6

12:55 pm-9:15 pm

1 stop9h 20m

Lambert-St Louis

Sun 1/11

2:54 pm-6:31 pm

Nonstop2h 37m

$342

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 4/9

3:43 pm-10:33 pm

1 stop7h 50m

Lambert-St Louis

Sun 4/12

10:42 am-9:57 am

1 stop22h 15m

$348

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 1/14

5:50 am-12:45 pm

2 stops7h 55m

Lambert-St Louis

Sun 1/18

2:35 pm-10:05 pm

1 stop6h 30m

$349

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 1/7

6:25 am-8:45 am

Nonstop3h 20m

Lambert-St Louis

Sat 1/10

8:45 am-12:20 pm

Nonstop2h 35m

$351

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 1/6

12:55 pm-9:15 pm

1 stop9h 20m

Lambert-St Louis

Sun 1/11

11:37 am-4:58 pm

1 stop4h 21m

$352

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 1/16

6:35 am-8:55 am

Nonstop3h 20m

Lambert-St Louis

Sun 1/18

5:55 pm-9:25 pm

Nonstop2h 30m

$369

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 12/22

6:36 am-1:23 pm

1 stop7h 47m

Lambert-St Louis

Mon 12/22

2:50 pm-6:29 pm

Nonstop2h 39m

$370

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 1/16

9:30 am-4:40 pm

1 stop8h 10m

Lambert-St Louis

Sun 1/18

5:55 pm-9:25 pm

Nonstop2h 30m

$379

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Boston to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to St. Louis?

In general, January is the cheapest month to fly from Boston to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $381. The month of August is another great option to travel to St. Louis, with average flight prices from Boston averaging around $382.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $421. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $499. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Boston in the evening is the least expensive time of day to depart. momondo users have found prices as low as $433 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $457 per ticket.

What is the cheapest Boston Logan Intl to Lambert-St Louis flight route?

Fly from Boston Logan Intl to Lambert-St Louis for the best Boston Logan Intl - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $443 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Boston for as low as $382 on momondo.

What cabin class options are available on Boston Logan Intl to Lambert-St Louis flights?

There are 3 cabin classes available to choose from on Boston Logan Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Boston to St. Louis flights?

You could potentially save up to 39% on your flight if you consider stops on a Boston to St. Louis flight.

How have Boston to St. Louis flight prices changed over time?

As of December 2025, prices for Boston to St. Louis flights are approximately 59% more expensive when compared to flights at the same time last year.

When to book flights from Boston to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Boston to St. Louis (BOS to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to St. Louis

Best Price Found

$184

Fastest flight time

2h 50m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Boston in the past 72 hours is $184. The best round-trip flight deal from Boston to St. Louis found on momondo in the last 72 hours is $383.
The fastest flight from Boston to St. Louis takes 2h 50m
Direct flights go from Boston to St. Louis every day.
There is 1 airport in St. Louis. From Boston there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Boston Logan Intl to Lambert-St Louis by plane?

    Lambert-St Louis is 1035.0 mi away from Boston Logan Intl. Flights usually cover this in 2h 50m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?

    Prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport were last updated today.

  • How many operators does momondo search for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Boston Logan Intl Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Boston to St. Louis?

  • What is the most popular airline from Boston to St. Louis?

Best airlines flying from Boston to St. Louis

Compare and see reviews for airlines that fly from Boston to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $83Free CancellationRating
6.3
8,175 reviews
Search Spirit Airlines flights
FrontierPriceFrom $90Free CancellationRating
5.8
3,084 reviews
Search Frontier flights
DeltaPriceFrom $216Free CancellationRating
7.9
8,008 reviews
Search Delta flights
United AirlinesPriceFrom $292Free CancellationRating
7.4
9,095 reviews
Search United Airlines flights
American AirlinesPriceFrom $297Free CancellationRating
7.2
11,048 reviews
Search American Airlines flights
SouthwestPriceFrom $322Free CancellationRating
7.9
4,252 reviews
Search Southwest flights

  • Southwest Flights From Boston to St. Louis

    Southwest operates around 12 flights from Boston to St. Louis every week. The average price of these flights found in the last 72 hours has been $468, but momondo users have found Southwest deals from Boston to St. Louis from as low as $322 round-trip. Southwest has been scored 7.9/10 in 4,253 reviews.

  • American Airlines Flights From Boston to St. Louis

    The best American Airlines deal for Boston to St. Louis flight tickets found on momondo in the last 72 hours was $297, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $453 round-trip. American Airlines operates 13 flights out of Boston into St. Louis in an average week, so prices vary by time and availability. 11,049 American Airlines reviews by users on momondo have scored the airline at 7.2/10.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Farmington
Festus
Clayton
Glencoe
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Boston to St. Louis?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Boston to St. Louis for you.

Can I find flights from Boston to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from Boston on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Boston to St. Louis?

momondo helps you find the best flight between Boston and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Boston to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from Boston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
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