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Cheap flights from St. Louis to Boston from $71

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Boston departing on 2/11. 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 St. Louis to Boston

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
5:42 pm - 2:38 pm
STL
-
BOS
19h 56m
1 stop
Multiple Airlines Logo
3:43 pm - 11:33 pm
BOS
-
STL
8h 50m
1 stop
$151Multiple Airlines
Tue, Feb 3 - Sat, Feb 7
Multiple Airlines Logo
8:17 pm - 1:07 am
STL
-
BOS
27h 50m
1 stop
Multiple Airlines Logo
2:23 pm - 10:27 pm
BOS
-
STL
9h 04m
1 stop
$164Multiple Airlines
Sat, Feb 14 - Wed, Feb 18
Multiple Airlines Logo
8:17 pm - 1:13 am
STL
-
BOS
27h 56m
1 stop
Multiple Airlines Logo
2:23 pm - 10:27 pm
BOS
-
STL
9h 04m
1 stop
$171Multiple Airlines
Wed, Feb 11 - Wed, Feb 18
Multiple Airlines Logo
5:42 pm - 11:19 pm
STL
-
BOS
28h 37m
1 stop
Multiple Airlines Logo
6:00 am - 11:33 pm
BOS
-
STL
18h 33m
2 stops
$175Multiple Airlines
Tue, Feb 3 - Sat, Feb 7
Frontier Logo
8:17 pm - 1:07 am
STL
-
BOS
27h 50m
1 stop
Frontier Logo
6:00 am - 6:51 am
BOS
-
STL
25h 51m
1 stop
$181Frontier
Sat, Feb 14 - Tue, Feb 17
Multiple Airlines Logo
8:17 pm - 1:13 am
STL
-
BOS
27h 56m
1 stop
Multiple Airlines Logo
2:23 pm - 10:27 pm
BOS
-
STL
9h 04m
1 stop
$185Multiple Airlines
Wed, Feb 11 - Wed, Feb 18
Multiple Airlines Logo
8:17 pm - 1:13 am
STL
-
BOS
27h 56m
1 stop
Multiple Airlines Logo
5:50 pm - 6:51 am
BOS
-
STL
38h 01m
2 stops
$188Multiple Airlines
Wed, Feb 11 - Wed, Feb 18
Multiple Airlines Logo
8:17 pm - 1:07 am
STL
-
BOS
27h 50m
1 stop
Multiple Airlines Logo
11:31 am - 6:51 am
BOS
-
STL
20h 20m
2 stops
$191Multiple Airlines
Sat, Feb 14 - Tue, Feb 17
Multiple Airlines Logo
3:49 pm - 11:37 am
STL
-
BOS
18h 48m
1 stop
Multiple Airlines Logo
5:50 pm - 6:51 am
BOS
-
STL
38h 01m
2 stops
$204Multiple Airlines
Mon, Feb 16 - Wed, Feb 18
Multiple Airlines Logo
3:49 pm - 9:06 am
STL
-
BOS
16h 17m
1 stop
Multiple Airlines Logo
4:22 pm - 11:19 pm
BOS
-
STL
7h 57m
1 stop
$206Multiple Airlines
Wed, Mar 4 - Fri, Mar 6

American Airlines flights from St. Louis to Boston

Our best American Airlines deals on St. Louis to Boston flight tickets
American Airlines
Mar 17
STL9:59 amLambert-St Louis
8h 24m
1 stop
BOS7:23 pmBoston Logan Intl
Mar 21
BOS9:00 amBoston Logan Intl
3h 16m
STL11:16 amLambert-St Louis
$269
American Airlines
Feb 11
STL6:00 amLambert-St Louis
8h 17m
1 stop
BOS3:17 pmBoston Logan Intl
Feb 18
BOS3:03 pmBoston Logan Intl
3h 16m
STL5:19 pmLambert-St Louis
$314
American Airlines
Mar 12
STL11:41 amLambert-St Louis
4h 42m
1 stop
BOS5:23 pmBoston Logan Intl
Mar 21
BOS9:00 amBoston Logan Intl
3h 16m
STL11:16 amLambert-St Louis
$329

Frontier flights from St. Louis to Boston

Our best Frontier deals on St. Louis to Boston flight tickets
Frontier
Jan 24
STL11:00 amLambert-St Louis
13h 13m
2 stops
BOS1:13 amBoston Logan Intl
Jan 25
BOS6:00 amBoston Logan Intl
25h 51m
1 stop
STL6:51 amLambert-St Louis
$225
Frontier
Mar 4
STL3:49 pmLambert-St Louis
16h 17m
1 stop
BOS9:06 amBoston Logan Intl
Mar 6
BOS12:56 pmBoston Logan Intl
21h 53m
2 stops
STL9:49 amLambert-St Louis
$230
Frontier
Mar 17
STL8:06 pmLambert-St Louis
14h 35m
2 stops
BOS11:41 amBoston Logan Intl
Mar 22
BOS12:35 pmBoston Logan Intl
25h 59m
1 stop
STL1:34 pmLambert-St Louis
$260

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Boston 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 January 14, 2026.
Use the filters below to find and compare flights from St. Louis to Boston that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 2/3

5:42 pm-2:38 pm

1 stop19h 56m

Boston Logan Intl

Sat 2/7

3:43 pm-11:33 pm

1 stop8h 50m

$151

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 2/14

8:17 pm-1:07 am

1 stop27h 50m

Boston Logan Intl

Wed 2/18

2:23 pm-10:27 pm

1 stop9h 04m

$164

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 2/11

8:17 pm-1:13 am

1 stop27h 56m

Boston Logan Intl

Wed 2/18

2:23 pm-10:27 pm

1 stop9h 04m

$171

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 2/3

5:42 pm-11:19 pm

1 stop28h 37m

Boston Logan Intl

Sat 2/7

6:00 am-11:33 pm

2 stops18h 33m

$175

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 2/14

8:17 pm-1:07 am

1 stop27h 50m

Boston Logan Intl

Tue 2/17

6:00 am-6:51 am

1 stop25h 51m

$181

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 2/11

8:17 pm-1:13 am

1 stop27h 56m

Boston Logan Intl

Wed 2/18

2:23 pm-10:27 pm

1 stop9h 04m

$185

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 2/11

8:17 pm-1:13 am

1 stop27h 56m

Boston Logan Intl

Wed 2/18

5:50 pm-6:51 am

2 stops38h 01m

$188

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 2/14

8:17 pm-1:07 am

1 stop27h 50m

Boston Logan Intl

Tue 2/17

11:31 am-6:51 am

2 stops20h 20m

$191

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 2/16

3:49 pm-11:37 am

1 stop18h 48m

Boston Logan Intl

Wed 2/18

5:50 pm-6:51 am

2 stops38h 01m

$204

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 3/4

3:49 pm-9:06 am

1 stop16h 17m

Boston Logan Intl

Fri 3/6

4:22 pm-11:19 pm

1 stop7h 57m

$206

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 Boston from

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

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 St. Louis and Boston?

What is the cheapest month to fly to Boston?

In general, September is the cheapest month to fly from St. Louis to Boston. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $382. If you aren’t able to travel during the month of September, then book flights to Boston from St. Louis during August instead. Flights to Boston in August, while not as cheap as those in September, still average around $409.

What is the cheapest day to depart on your flight to Boston?

The cheapest day to depart from St. Louis to Boston is on a Friday when prices can be found for as low as $548. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Monday is $900.

What is the cheapest time of day to depart on your flight to Boston?

According to our data, the cheapest time of day to fly to Boston is in the evening. momondo users have found flights departing from St. Louis to Boston in the evening for as low as $431. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. At noon is when there is more demand to fly to Boston, so prices are often more expensive at around $1,053 per ticket.

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

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

How far in advance should I book a flight to Boston?

You are more likely to see cheaper flights to Boston from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Boston for around $437 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Boston from St. Louis for as low as $350 on momondo.

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

There are 3 cabin classes available to choose from on Lambert-St Louis to Boston Logan Intl 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 St. Louis to Boston flights?

You could potentially save up to 17% on your flight if you consider stops on a St. Louis to Boston flight.

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

As of January 2026, prices for St. Louis to Boston flights are approximately 8% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to Boston

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

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

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

Best Price Found

$350

Fastest flight time

2h 25m

Direct flights

Every day

Airports in Boston

1 airport
The best one-way flight to Boston from St. Louis in the past 72 hours is $350. The best round-trip flight deal from St. Louis to Boston found on momondo in the last 72 hours is $506.
The fastest flight from St. Louis to Boston takes 2h 25m
Direct flights go from St. Louis to Boston every day.
There is 1 airport in Boston. From St. Louis there are direct flights to Boston Logan Intl (BOS).
Search flight deals

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

    Boston Logan Intl is 1035.0 mi away from Lambert-St Louis. By plane, this route typically takes 2h 25m.

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

    Prices for flights from Lambert-St Louis Airport to Boston Logan Intl Airport are refreshed on a daily basis.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Boston Logan Intl Airport.

  • What documentation or ID do you need to fly to Boston Logan Intl Airport?

    The travel and health documents required for your trip to Boston Logan Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Boston Logan Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

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

Best airlines flying from St. Louis to Boston

Compare and see reviews for airlines that fly from St. Louis to Boston with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $100Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $124Free CancellationRating
6.3
8,311 reviews
Search Spirit Airlines flights
DeltaPriceFrom $158Free CancellationRating
7.9
8,040 reviews
Search Delta flights
United AirlinesPriceFrom $216Free CancellationRating
7.4
9,156 reviews
Search United Airlines flights
American AirlinesPriceFrom $277Free CancellationRating
7.2
11,120 reviews
Search American Airlines flights
SouthwestPriceFrom $303Free CancellationRating
8.0
4,258 reviews
Search Southwest flights

  • Southwest Flights From St. Louis to Boston

    The lowest priced Southwest flight from St. Louis to Boston from the last 72 hours was $303. Generally, Southwest has 4 flights on this route every week with an average price of $457. Southwest is rated 8.0/10 by our users.

  • American Airlines Flights From St. Louis to Boston

    The best American Airlines deal for St. Louis to Boston flight tickets found on momondo in the last 72 hours was $277, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $435 round-trip. American Airlines operates 12 flights out of St. Louis into Boston in an average week, so prices vary by time and availability. 11,122 American Airlines reviews by users on momondo have scored the airline at 7.2/10.

Traveling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Hampton Beach
Salem
Ogunquit
Old Orchard Beach
Hampton
York Beach
Plymouth
Kennebunkport
South Yarmouth
Cambridge
Narragansett
Gloucester
Falmouth
Nashua
Laconia
Brockton
Sturbridge
Everett
Chatham
Concord

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Boston. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to Boston from St. Louis with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Boston from St. Louis.

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

Price alerts on flights to Boston from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Boston 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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