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Cheap flights from Boston to St. Louis from $63

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 2/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:55 am - 10:56 am
BOS
-
STL
24h 01m1 stop
Multiple Airlines Logo
5:11 pm - 4:28 pm
STL
-
BOS
22h 17m2 stops
$327Multiple Airlines
Mon, Jan 5 - Sun, Jan 11
Multiple Airlines Logo
3:43 pm - 10:33 pm
BOS
-
STL
7h 50m1 stop
Multiple Airlines Logo
5:11 pm - 12:49 pm
STL
-
BOS
18h 38m2 stops
$328Multiple Airlines
Mon, Jan 12 - Thu, Jan 15
Multiple Airlines Logo
11:55 am - 10:56 am
BOS
-
STL
24h 01m1 stop
Multiple Airlines Logo
5:11 pm - 10:46 am
STL
-
BOS
16h 35m1 stop
$329Multiple Airlines
Mon, Jan 5 - Sun, Jan 11
Multiple Airlines Logo
11:03 am - 8:07 pm
BOS
-
STL
34h 04m2 stops
Multiple Airlines Logo
5:11 pm - 10:01 am
STL
-
BOS
15h 50m1 stop
$330Multiple Airlines
Sun, Jan 4 - Tue, Jan 6
Multiple Airlines Logo
10:56 am - 9:45 am
BOS
-
STL
23h 49m1 stop
Multiple Airlines Logo
5:11 pm - 11:34 am
STL
-
BOS
17h 23m1 stop
$332Multiple Airlines
Sun, Jan 4 - Tue, Jan 6
Multiple Airlines Logo
12:29 pm - 10:33 pm
BOS
-
STL
11h 04m1 stop
Multiple Airlines Logo
5:11 pm - 11:19 pm
STL
-
BOS
29h 08m1 stop
$333Multiple Airlines
Tue, Jan 6 - Thu, Jan 15
Frontier Logo
10:52 am - 10:33 pm
BOS
-
STL
12h 41m2 stops
Frontier Logo
10:42 am - 9:57 am
STL
-
BOS
22h 15m1 stop
$335Frontier
Thu, Apr 9 - Sun, Apr 12
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
$336American Airlines
Mon, Jan 12 - Wed, Jan 14
Multiple Airlines Logo
11:03 am - 8:12 am
BOS
-
STL
22h 09m2 stops
Multiple Airlines Logo
5:11 pm - 2:38 pm
STL
-
BOS
20h 27m1 stop
$341Multiple Airlines
Sun, Jan 4 - Tue, Jan 13
Multiple Airlines Logo
10:56 am - 9:45 am
BOS
-
STL
23h 49m1 stop
Multiple Airlines Logo
8:32 pm - 1:13 am
STL
-
BOS
27h 41m1 stop
$343Multiple Airlines
Sun, Jan 4 - Wed, Jan 14

Frontier flights from Boston to St. Louis

Our best Frontier deals on Boston to St. Louis flight tickets
Frontier
Dec 18
BOS12:22 pmBoston Logan Intl
11h 11m
1 stop
STL10:33 pmLambert-St Louis
Dec 31
STL4:27 pmLambert-St Louis
16h 25m
1 stop
BOS9:52 amBoston Logan Intl
$329
Find similar
Frontier
Apr 9
BOS10:52 amBoston Logan Intl
12h 41m
2 stops
STL10:33 pmLambert-St Louis
Apr 12
STL10:42 amLambert-St Louis
22h 15m
1 stop
BOS9:57 amBoston Logan Intl
$335
Find similar
Frontier
Dec 24
BOS11:09 amBoston Logan Intl
23h 31m
1 stop
STL9:40 amLambert-St Louis
Jan 11
STL5:11 pmLambert-St Louis
16h 35m
1 stop
BOS10:46 amBoston Logan Intl
$359
Find similar

American Airlines flights from Boston to St. Louis

Our best American Airlines deals on Boston to St. Louis flight tickets
American Airlines
Jan 12
BOS6:30 amBoston Logan Intl
3h 33m
STL9:03 amLambert-St Louis
Jan 14
STL11:05 amLambert-St Louis
8h 40m
1 stop
BOS8:45 pmBoston Logan Intl
$336
Find similar
American Airlines
Jan 8
BOS9:51 amBoston Logan Intl
9h 23m
1 stop
STL6:14 pmLambert-St Louis
Jan 15
STL2:54 pmLambert-St Louis
2h 37m
BOS6:31 pmBoston Logan Intl
$345
Find similar
American Airlines
Jan 8
BOS9:51 amBoston Logan Intl
9h 23m
1 stop
STL6:14 pmLambert-St Louis
Jan 15
STL7:00 amLambert-St Louis
8h 53m
1 stop
BOS4:53 pmBoston Logan Intl
$348
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 17, 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

Mon 1/5

11:55 am-10:56 am

1 stop24h 01m

Lambert-St Louis

Sun 1/11

5:11 pm-4:28 pm

2 stops22h 17m

$327

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 1/12

3:43 pm-10:33 pm

1 stop7h 50m

Lambert-St Louis

Thu 1/15

5:11 pm-12:49 pm

2 stops18h 38m

$328

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 1/5

11:55 am-10:56 am

1 stop24h 01m

Lambert-St Louis

Sun 1/11

5:11 pm-10:46 am

1 stop16h 35m

$329

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sun 1/4

11:03 am-8:07 pm

2 stops34h 04m

Lambert-St Louis

Tue 1/6

5:11 pm-10:01 am

1 stop15h 50m

$330

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sun 1/4

10:56 am-9:45 am

1 stop23h 49m

Lambert-St Louis

Tue 1/6

5:11 pm-11:34 am

1 stop17h 23m

$332

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 1/6

12:29 pm-10:33 pm

1 stop11h 04m

Lambert-St Louis

Thu 1/15

5:11 pm-11:19 pm

1 stop29h 08m

$333

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 4/9

10:52 am-10:33 pm

2 stops12h 41m

Lambert-St Louis

Sun 4/12

10:42 am-9:57 am

1 stop22h 15m

$335

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 1/12

6:30 am-9:03 am

Nonstop3h 33m

Lambert-St Louis

Wed 1/14

11:05 am-8:45 pm

1 stop8h 40m

$336

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sun 1/4

11:03 am-8:12 am

2 stops22h 09m

Lambert-St Louis

Tue 1/13

5:11 pm-2:38 pm

1 stop20h 27m

$341

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sun 1/4

10:56 am-9:45 am

1 stop23h 49m

Lambert-St Louis

Wed 1/14

8:32 pm-1:13 am

1 stop27h 41m

$343

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, August 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 $382. The month of January is another great option to travel to St. Louis, with average flight prices from Boston averaging around $385.

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 $423. 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 $500. 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 $435 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 $383 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 60% 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

$193

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 $193. The best round-trip flight deal from Boston to St. Louis found on momondo in the last 72 hours is $371.
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 $71Free CancellationRating
6.3
8,188 reviews
Search Spirit Airlines flights
FrontierPriceFrom $90Free CancellationRating
5.8
3,082 reviews
Search Frontier flights
DeltaPriceFrom $216Free CancellationRating
7.9
8,008 reviews
Search Delta flights
American AirlinesPriceFrom $290Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
United AirlinesPriceFrom $292Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
SouthwestPriceFrom $321Free CancellationRating
7.9
4,250 reviews
Search Southwest flights

  • Southwest Flights From Boston to St. Louis

    Southwest operates around 9 flights from Boston to St. Louis every week. The average price of these flights found in the last 72 hours has been $469, but momondo users have found Southwest deals from Boston to St. Louis from as low as $321 round-trip. Southwest has been scored 7.9/10 in 4,250 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 $290, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $452 round-trip. American Airlines operates 3 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
Clayton
Festus
Glencoe
Farmington
Eureka
Edwardsville
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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