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Cheap flights from Boston to St. Louis from $68

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 1/27. 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

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Multiple Airlines Logo
12:29 pm - 10:33 pmBOS-STL
11h 04m1 stop
Multiple Airlines Logo
10:57 am - 9:42 amSTL-BOS
21h 45m1 stop
$351Multiple Airlines
Find Deal
Thu, Jan 1 - Sun, Jan 4
Frontier Logo
6:00 am - 8:12 amBOS-STL
27h 12m2 stops
Frontier Logo
10:48 am - 10:08 amSTL-BOS
22h 20m1 stop
$353Frontier
Find Deal
Sun, Dec 21 - Tue, Dec 23
American Airlines Logo
8:00 am - 3:36 pmBOS-STL
8h 36m1 stop
American Airlines Logo
2:54 pm - 6:31 pmSTL-BOS
2h 37mnonstop
$354American Airlines
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Sat, Jan 31 - Tue, Feb 3
Multiple Airlines Logo
8:08 am - 10:33 pmBOS-STL
15h 25m2 stops
Multiple Airlines Logo
5:11 pm - 10:01 amSTL-BOS
15h 50m1 stop
$356Multiple Airlines
Find Deal
Fri, Jan 2 - Tue, Jan 6
Frontier Logo
11:09 am - 9:40 amBOS-STL
23h 31m1 stop
Frontier Logo
10:48 am - 10:08 amSTL-BOS
22h 20m1 stop
$357Frontier
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Wed, Dec 24 - Tue, Dec 30
Southwest Logo
7:45 am - 4:20 pmBOS-STL
9h 35m2 stops
Southwest Logo
8:15 am - 4:10 pmSTL-BOS
6h 55m2 stops
$358Southwest
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Thu, Jan 1 - Tue, Jan 6
Multiple Airlines Logo
12:29 pm - 9:40 amBOS-STL
22h 11m2 stops
Multiple Airlines Logo
10:57 am - 9:42 amSTL-BOS
21h 45m1 stop
$359Multiple Airlines
Find Deal
Wed, Dec 31 - Sun, Jan 4
American Airlines Logo
8:50 am - 11:14 amBOS-STL
3h 24mnonstop
American Airlines Logo
6:30 am - 2:20 pmSTL-BOS
6h 50m1 stop
$360American Airlines
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Wed, Dec 17 - Wed, Dec 31
Multiple Airlines Logo
12:29 pm - 9:40 amBOS-STL
22h 11m2 stops
Multiple Airlines Logo
10:42 am - 9:42 amSTL-BOS
22h 00m1 stop
$361Multiple Airlines
Find Deal
Mon, Dec 22 - Thu, Jan 1
Multiple Airlines Logo
12:29 pm - 10:33 pmBOS-STL
11h 04m1 stop
Multiple Airlines Logo
4:27 pm - 10:01 amSTL-BOS
16h 34m1 stop
$362Multiple Airlines
Find Deal
Thu, Jan 1 - Mon, Jan 5

Frontier flights from Boston to St. Louis

Our best Frontier deals on Boston to St. Louis flight tickets
Frontier
Dec 21
BOS6:00 amBoston Logan Intl
27h 12m
2 stops
STL8:12 amLambert-St Louis
Dec 23
STL10:48 amLambert-St Louis
22h 20m
1 stop
BOS10:08 amBoston Logan Intl
$353
Find similar
Frontier
Dec 24
BOS11:09 amBoston Logan Intl
23h 31m
1 stop
STL9:40 amLambert-St Louis
Dec 30
STL10:48 amLambert-St Louis
22h 20m
1 stop
BOS10:08 amBoston Logan Intl
$357
Find similar
Frontier
Mar 18
BOS10:52 amBoston Logan Intl
23h 55m
1 stop
STL9:47 amLambert-St Louis
Mar 22
STL10:42 amLambert-St Louis
22h 15m
1 stop
BOS9:57 amBoston Logan Intl
$366
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American Airlines flights from Boston to St. Louis

Our best American Airlines deals on Boston to St. Louis flight tickets
American Airlines
Jan 31
BOS8:00 amBoston Logan Intl
8h 36m
1 stop
STL3:36 pmLambert-St Louis
Feb 3
STL2:54 pmLambert-St Louis
2h 37m
BOS6:31 pmBoston Logan Intl
$354
Find similar
American Airlines
Dec 17
BOS8:50 amBoston Logan Intl
3h 24m
STL11:14 amLambert-St Louis
Dec 31
STL6:30 amLambert-St Louis
6h 50m
1 stop
BOS2:20 pmBoston Logan Intl
$360
Find similar
American Airlines
Dec 25
BOS8:45 amBoston Logan Intl
3h 25m
STL11:10 amLambert-St Louis
Dec 31
STL6:30 amLambert-St Louis
4h 53m
1 stop
BOS12:23 pmBoston Logan Intl
$375
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 2, 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

Thu 1/1

12:29 pm-10:33 pm

1 stop11h 04m

Lambert-St Louis

Sun 1/4

10:57 am-9:42 am

1 stop21h 45m

$351

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sun 12/21

6:00 am-8:12 am

2 stops27h 12m

Lambert-St Louis

Tue 12/23

10:48 am-10:08 am

1 stop22h 20m

$353

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 1/31

8:00 am-3:36 pm

1 stop8h 36m

Lambert-St Louis

Tue 2/3

2:54 pm-6:31 pm

Nonstop2h 37m

$354

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 1/2

8:08 am-10:33 pm

2 stops15h 25m

Lambert-St Louis

Tue 1/6

5:11 pm-10:01 am

1 stop15h 50m

$356

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 12/24

11:09 am-9:40 am

1 stop23h 31m

Lambert-St Louis

Tue 12/30

10:48 am-10:08 am

1 stop22h 20m

$357

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 1/1

7:45 am-4:20 pm

2 stops9h 35m

Lambert-St Louis

Tue 1/6

8:15 am-4:10 pm

2 stops6h 55m

$358

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 12/31

12:29 pm-9:40 am

2 stops22h 11m

Lambert-St Louis

Sun 1/4

10:57 am-9:42 am

1 stop21h 45m

$359

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 12/17

8:50 am-11:14 am

Nonstop3h 24m

Lambert-St Louis

Wed 12/31

6:30 am-2:20 pm

1 stop6h 50m

$360

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 12/22

12:29 pm-9:40 am

2 stops22h 11m

Lambert-St Louis

Thu 1/1

10:42 am-9:42 am

1 stop22h 00m

$361

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 1/1

12:29 pm-10:33 pm

1 stop11h 04m

Lambert-St Louis

Mon 1/5

4:27 pm-10:01 am

1 stop16h 34m

$362

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 typical price of a round-trip flight between Boston and St. Louis?

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 $392.

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 $424. 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 $434 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 $456 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 $444 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 $391 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 35% 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 22% 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 55m

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 $378.
The fastest flight from Boston to St. Louis takes 2h 55m
Direct flights go from Boston to St. Louis every day.
There is 1 airport near St. Louis: 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 3h 17m, 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
8,156 reviews
Search Spirit Airlines flights
FrontierPriceFrom $90Free CancellationRating
5.8
3,094 reviews
Search Frontier flights
DeltaPriceFrom $216Free CancellationRating
7.9
8,009 reviews
Search Delta flights
United AirlinesPriceFrom $292Free CancellationRating
7.4
9,064 reviews
Search United Airlines flights
American AirlinesPriceFrom $297Free CancellationRating
7.2
11,041 reviews
Search American Airlines flights
SouthwestPriceFrom $322Free CancellationRating
8.0
4,253 reviews
Search Southwest flights

  • Southwest Flights From Boston to St. Louis

    Southwest operates around 17 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 $322 round-trip. Southwest has been scored 8.0/10 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 3 flights out of Boston into St. Louis in an average week, so prices vary by time and availability. 11,041 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
Collinsville
St. Peters
Alton
Farmington
Clayton
Festus
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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