Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Boston from $44

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 12/23. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Boston

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
1:59 pm - 12:13 amSTL-BOS
9h 14m1 stop
American Airlines Logo
8:50 am - 11:14 amBOS-STL
3h 24mnonstop
$314American Airlines
Find Deal
Sat, Dec 13 - Tue, Dec 16
Multiple Airlines Logo
10:42 am - 1:19 amSTL-BOS
13h 37m1 stop
Multiple Airlines Logo
11:55 am - 10:56 amBOS-STL
24h 01m1 stop
$316Multiple Airlines
Find Deal
Thu, Jan 1 - Mon, Jan 5
American Airlines Logo
12:11 pm - 3:50 pmSTL-BOS
2h 39mnonstop
American Airlines Logo
9:51 am - 6:13 pmBOS-STL
9h 22m1 stop
$323American Airlines
Find Deal
Tue, Jan 20 - Sat, Jan 24
American Airlines Logo
11:50 am - 3:30 pmSTL-BOS
2h 40mnonstop
American Airlines Logo
6:40 am - 6:13 pmBOS-STL
12h 33m1 stop
$324American Airlines
Find Deal
Tue, Dec 16 - Sat, Jan 10
Multiple Airlines Logo
8:37 pm - 10:21 amSTL-BOS
12h 44m1 stop
Multiple Airlines Logo
12:29 pm - 10:33 pmBOS-STL
11h 04m1 stop
$329Multiple Airlines
Find Deal
Fri, Dec 19 - Sun, Dec 21
Frontier Logo
7:43 pm - 1:14 amSTL-BOS
28h 31m2 stops
Frontier Logo
6:00 am - 9:40 amBOS-STL
28h 40m1 stop
$330Frontier
Find Deal
Fri, Dec 26 - Sat, Jan 3
American Airlines Logo
6:00 am - 4:49 pmSTL-BOS
9h 49m1 stop
American Airlines Logo
6:36 am - 1:38 pmBOS-STL
8h 02m1 stop
$332American Airlines
Find Deal
Wed, Dec 24 - Sat, Dec 27
American Airlines Logo
11:27 am - 7:02 pmSTL-BOS
6h 35m1 stop
American Airlines Logo
9:51 am - 6:13 pmBOS-STL
9h 22m1 stop
$333American Airlines
Find Deal
Tue, Jan 20 - Sat, Jan 24
Multiple Airlines Logo
4:13 pm - 10:04 amSTL-BOS
16h 51m1 stop
Multiple Airlines Logo
9:54 pm - 10:33 pmBOS-STL
49h 39m2 stops
$335Multiple Airlines
Find Deal
Sun, Nov 23 - Sun, Nov 30
American Airlines Logo
6:41 am - 4:06 pmSTL-BOS
8h 25m1 stop
American Airlines Logo
6:30 am - 9:03 amBOS-STL
3h 33mnonstop
$336American Airlines
Find Deal
Mon, Jan 5 - Thu, Jan 8

Delta flights from St. Louis to Boston

Our best Delta deals on St. Louis to Boston flight tickets
Delta
Feb 28
STL6:35 amLambert-St Louis
4h 44m
1 stop
BOS12:19 pmBoston Logan Intl
Mar 4
BOS1:00 pmBoston Logan Intl
8h 11m
1 stop
STL8:11 pmLambert-St Louis
$371
Find similar
Delta
Dec 24
STL7:00 amLambert-St Louis
6h 47m
1 stop
BOS2:47 pmBoston Logan Intl
Jan 1
BOS7:05 amBoston Logan Intl
14h 36m
2 stops
STL8:41 pmLambert-St Louis
$374
Find similar
Delta
Dec 15
STL11:40 amLambert-St Louis
5h 34m
1 stop
BOS6:14 pmBoston Logan Intl
Dec 24
BOS5:15 pmBoston Logan Intl
7h 23m
1 stop
STL11:38 pmLambert-St Louis
$385
Find similar

American Airlines flights from St. Louis to Boston

Our best American Airlines deals on St. Louis to Boston flight tickets
American Airlines
Dec 13
STL1:59 pmLambert-St Louis
9h 14m
1 stop
BOS12:13 amBoston Logan Intl
Dec 16
BOS8:50 amBoston Logan Intl
3h 24m
STL11:14 amLambert-St Louis
$314
Find similar
American Airlines
Jan 20
STL12:11 pmLambert-St Louis
2h 39m
BOS3:50 pmBoston Logan Intl
Jan 24
BOS9:51 amBoston Logan Intl
9h 22m
1 stop
STL6:13 pmLambert-St Louis
$323
Find similar
American Airlines
Dec 16
STL11:50 amLambert-St Louis
2h 40m
BOS3:30 pmBoston Logan Intl
Jan 10
BOS6:40 amBoston Logan Intl
12h 33m
1 stop
STL6:13 pmLambert-St Louis
$324
Find similar

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 November 13, 2025.
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

Sat 12/13

1:59 pm-12:13 am

1 stop9h 14m

Boston Logan Intl

Tue 12/16

8:50 am-11:14 am

Nonstop3h 24m

$314

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 1/1

10:42 am-1:19 am

1 stop13h 37m

Boston Logan Intl

Mon 1/5

11:55 am-10:56 am

1 stop24h 01m

$316

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 1/20

12:11 pm-3:50 pm

Nonstop2h 39m

Boston Logan Intl

Sat 1/24

9:51 am-6:13 pm

1 stop9h 22m

$323

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 12/16

11:50 am-3:30 pm

Nonstop2h 40m

Boston Logan Intl

Sat 1/10

6:40 am-6:13 pm

1 stop12h 33m

$324

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 12/19

8:37 pm-10:21 am

1 stop12h 44m

Boston Logan Intl

Sun 12/21

12:29 pm-10:33 pm

1 stop11h 04m

$329

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 12/26

7:43 pm-1:14 am

2 stops28h 31m

Boston Logan Intl

Sat 1/3

6:00 am-9:40 am

1 stop28h 40m

$330

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 12/24

6:00 am-4:49 pm

1 stop9h 49m

Boston Logan Intl

Sat 12/27

6:36 am-1:38 pm

1 stop8h 02m

$332

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 1/20

11:27 am-7:02 pm

1 stop6h 35m

Boston Logan Intl

Sat 1/24

9:51 am-6:13 pm

1 stop9h 22m

$333

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sun 11/23

4:13 pm-10:04 am

1 stop16h 51m

Boston Logan Intl

Sun 11/30

9:54 pm-10:33 pm

2 stops49h 39m

$335

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 1/5

6:41 am-4:06 pm

1 stop8h 25m

Boston Logan Intl

Thu 1/8

6:30 am-9:03 am

Nonstop3h 33m

$336

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 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 $560. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Saturday is $761.

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 $429. 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 $1,050 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 $433 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 $359 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 3% 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 November 2025, prices for St. Louis to Boston flights are approximately 46% more expensive 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

$289

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 $289. The best round-trip flight deal from St. Louis to Boston found on momondo in the last 72 hours is $462.
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 near Boston: 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 30m.

  • 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 $75Free CancellationRating
5.8
3,114 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $124Free CancellationRating
6.3
8,139 reviews
Search Spirit Airlines flights
DeltaPriceFrom $216Free CancellationRating
7.9
8,007 reviews
Search Delta flights
United AirlinesPriceFrom $216Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
American AirlinesPriceFrom $290Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
SouthwestPriceFrom $304Free CancellationRating
8.0
4,236 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 $304. Generally, Southwest has 17 flights on this route every week with an average price of $455. 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 $290, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $438 round-trip. American Airlines operates 9 flights out of St. Louis into Boston in an average week, so prices vary by time and availability. 11,050 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
Cambridge
South Yarmouth
Narragansett
Nashua
Gloucester
Falmouth
Laconia
Brockton
Concord
Everett
Sturbridge
Chatham

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
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 12/13
Sat 12/20
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States