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Cheap flights from Boston to St. Louis from $87

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 10/15. 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

Multiple Airlines Logo
8:24 pm - 6:10 pmBOS-STL
22h 46m1 stop
Multiple Airlines Logo
8:21 pm - 1:20 pmSTL-BOS
15h 59m2 stops
$273Multiple Airlines
Find Deal
vie., oct. 17 - lun., oct. 20
Spirit Airlines Logo
9:48 pm - 11:01 amBOS-STL
14h 13m1 stop
Spirit Airlines Logo
12:20 pm - 12:40 amSTL-BOS
11h 20m1 stop
$275Spirit Airlines
Find Deal
mié., feb. 25 - dom., mar. 1
American Airlines Logo
8:00 am - 4:04 pmBOS-STL
9h 04m1 stop
American Airlines Logo
7:00 pm - 10:37 pmSTL-BOS
2h 37mnonstop
$276American Airlines
Find Deal
sáb., oct. 18 - lun., oct. 20
Multiple Airlines Logo
12:31 pm - 11:02 amBOS-STL
23h 31m1 stop
Multiple Airlines Logo
7:45 pm - 10:08 pmSTL-BOS
25h 23m2 stops
$278Multiple Airlines
Find Deal
sáb., nov. 1 - mar., nov. 4
Multiple Airlines Logo
12:31 pm - 10:02 amBOS-STL
22h 31m1 stop
Multiple Airlines Logo
11:23 am - 9:00 amSTL-BOS
20h 37m1 stop
$279Multiple Airlines
Find Deal
sáb., oct. 25 - dom., nov. 9
American Airlines Logo
4:20 pm - 8:20 pmBOS-STL
5h 00m1 stop
American Airlines Logo
1:59 pm - 11:59 pmSTL-BOS
9h 00m1 stop
$280American Airlines
Find Deal
mié., dic. 3 - sáb., dic. 6
Multiple Airlines Logo
8:24 pm - 6:10 pmBOS-STL
22h 46m1 stop
Multiple Airlines Logo
6:05 pm - 1:20 pmSTL-BOS
18h 15m1 stop
$282Multiple Airlines
Find Deal
vie., oct. 17 - lun., oct. 20
Frontier Logo
9:50 am - 10:37 amBOS-STL
25h 47m1 stop
Frontier Logo
7:52 pm - 8:55 amSTL-BOS
36h 03m2 stops
$288Frontier
Find Deal
jue., oct. 9 - mar., oct. 21
United Airlines Logo
6:00 am - 10:49 amBOS-STL
5h 49m1 stop
United Airlines Logo
5:28 pm - 12:50 amSTL-BOS
6h 22m1 stop
$297United Airlines
Find Deal
mar., oct. 7 - mar., oct. 7
Southwest Logo
7:30 am - 9:35 amBOS-STL
3h 05mnonstop
Southwest Logo
8:10 pm - 11:40 pmSTL-BOS
2h 30mnonstop
$333Southwest
Find Deal
mar., oct. 28 - jue., oct. 30

American Airlines flights from Boston to St. Louis

Our best American Airlines deals on Boston to St. Louis flight tickets
American Airlines
Oct 18
BOS8:00 amBoston Logan Intl
9h 04m
1 stop
STL4:04 pmLambert-St Louis
Oct 20
STL7:00 pmLambert-St Louis
2h 37m
BOS10:37 pmBoston Logan Intl
$276
Find similar
American Airlines
Dec 3
BOS4:20 pmBoston Logan Intl
5h 00m
1 stop
STL8:20 pmLambert-St Louis
Dec 6
STL1:59 pmLambert-St Louis
9h 00m
1 stop
BOS11:59 pmBoston Logan Intl
$280
Find similar
American Airlines
Nov 18
BOS6:48 amBoston Logan Intl
9h 14m
1 stop
STL3:02 pmLambert-St Louis
Nov 22
STL9:12 amLambert-St Louis
6h 50m
1 stop
BOS5:02 pmBoston Logan Intl
$286
Find similar

United Airlines flights from Boston to St. Louis

Our best United Airlines deals on Boston to St. Louis flight tickets
United Airlines
Oct 7
BOS6:00 amBoston Logan Intl
5h 49m
1 stop
STL10:49 amLambert-St Louis
Oct 7
STL5:28 pmLambert-St Louis
6h 22m
1 stop
BOS12:50 amBoston Logan Intl
$297
Find similar
United Airlines
Sep 27
BOS6:15 pmBoston Logan Intl
5h 20m
1 stop
STL10:35 pmLambert-St Louis
Sep 30
STL3:23 pmLambert-St Louis
23h 59m
3 stops
BOS4:22 pmBoston Logan Intl
$638
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 septiembre 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

vie. 10/17

8:24 pm-6:10 pm

1 stop22h 46m

Lambert-St Louis

lun. 10/20

8:21 pm-1:20 pm

2 stops15h 59m

$273

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mié. 2/25

9:48 pm-11:01 am

1 stop14h 13m

Lambert-St Louis

dom. 3/1

12:20 pm-12:40 am

1 stop11h 20m

$275

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

sáb. 10/18

8:00 am-4:04 pm

1 stop9h 04m

Lambert-St Louis

lun. 10/20

7:00 pm-10:37 pm

Nonstop2h 37m

$276

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

sáb. 11/1

12:31 pm-11:02 am

1 stop23h 31m

Lambert-St Louis

mar. 11/4

7:45 pm-10:08 pm

2 stops25h 23m

$278

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

sáb. 10/25

12:31 pm-10:02 am

1 stop22h 31m

Lambert-St Louis

dom. 11/9

11:23 am-9:00 am

1 stop20h 37m

$279

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mié. 12/3

4:20 pm-8:20 pm

1 stop5h 00m

Lambert-St Louis

sáb. 12/6

1:59 pm-11:59 pm

1 stop9h 00m

$280

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

vie. 10/17

8:24 pm-6:10 pm

1 stop22h 46m

Lambert-St Louis

lun. 10/20

6:05 pm-1:20 pm

1 stop18h 15m

$282

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

jue. 10/9

9:50 am-10:37 am

1 stop25h 47m

Lambert-St Louis

mar. 10/21

7:52 pm-8:55 am

2 stops36h 03m

$288

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mar. 10/7

6:00 am-10:49 am

1 stop5h 49m

Lambert-St Louis

mar. 10/7

5:28 pm-12:50 am

1 stop6h 22m

$297

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mar. 10/28

7:30 am-9:35 am

Nonstop3h 05m

Lambert-St Louis

jue. 10/30

8:10 pm-11:40 pm

Nonstop2h 30m

$333

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 $383. The month of January is another great option to travel to St. Louis, with average flight prices from Boston averaging around $403.

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 $425. 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 $436 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 $455 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 $442 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 $396 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 3% 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 September 2025, prices for Boston to St. Louis flights are approximately 111% 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

$170

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 $170. The best round-trip flight deal from Boston to St. Louis found on momondo in the last 72 hours is $356.
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 05m, 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
8,023 reviews
Search Spirit Airlines flights
FrontierPriceFrom $113Free CancellationRating
5.8
3,173 reviews
Search Frontier flights
DeltaPriceFrom $216Free CancellationRating
7.9
7,961 reviews
Search Delta flights
United AirlinesPriceFrom $257Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
American AirlinesPriceFrom $297Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $323Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

  • Southwest Flights From Boston to St. Louis

    Southwest operates around 16 flights from Boston to St. Louis every week. The average price of these flights found in the last 72 hours has been $462, but momondo users have found Southwest deals from Boston to St. Louis from as low as $323 round-trip. Southwest has been scored 8.0/10 in 4,242 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 $459 round-trip. American Airlines operates 10 flights out of Boston into St. Louis in an average week, so prices vary by time and availability. 10,000 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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
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.
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vie. 10/17
vie. 10/24
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