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Cheap flights from St. Louis to Boston from $73

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 12/5. 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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Cheap round-trip flights

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Multiple Airlines Logo
4:56 pm - 10:48 amSTL-BOS
16h 52m1 stop
Multiple Airlines Logo
12:00 pm - 10:05 amBOS-STL
23h 05m2 stops
$295Multiple Airlines
Find Deal
Fri, Nov 14 - Tue, Nov 18
Frontier Logo
5:33 pm - 12:44 amSTL-BOS
6h 11m1 stop
Frontier Logo
11:47 am - 10:33 pmBOS-STL
11h 46m1 stop
$296Frontier
Find Deal
Thu, Dec 18 - Sun, Jan 11
Southwest Logo
1:50 pm - 5:20 pmSTL-BOS
2h 30mnonstop
Southwest Logo
9:05 am - 3:50 pmBOS-STL
7h 45m1 stop
$307Southwest
Find Deal
Wed, Dec 17 - Thu, Dec 25
United Airlines Logo
10:00 am - 5:15 pmSTL-BOS
6h 15m1 stop
United Airlines Logo
7:32 pm - 11:33 pmBOS-STL
5h 01m1 stop
$308United Airlines
Find Deal
Wed, Dec 17 - Thu, Dec 25
American Airlines Logo
6:00 am - 3:30 pmSTL-BOS
8h 30m1 stop
American Airlines Logo
9:00 am - 4:36 pmBOS-STL
8h 36m1 stop
$311American Airlines
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Sat, Nov 8 - Wed, Nov 12
American Airlines Logo
6:00 am - 3:30 pmSTL-BOS
8h 30m1 stop
American Airlines Logo
12:02 pm - 2:22 pmBOS-STL
3h 20mnonstop
$313American Airlines
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Sat, Nov 8 - Tue, Nov 11
Delta Logo
3:59 pm - 11:16 pmSTL-BOS
6h 17m1 stop
Delta Logo
8:15 am - 1:00 pmBOS-STL
5h 45m1 stop
$334Delta
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Sat, Nov 1 - Mon, Nov 24
United Airlines Logo
11:05 am - 5:17 pmSTL-BOS
5h 12m1 stop
United Airlines Logo
5:20 am - 12:27 pmBOS-STL
8h 07m2 stops
$335United Airlines
Find Deal
Wed, Dec 24 - Wed, Dec 31
Southwest Logo
8:25 am - 4:35 pmSTL-BOS
7h 10m2 stops
Southwest Logo
5:35 pm - 10:00 pmBOS-STL
5h 25m1 stop
$338Southwest
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Thu, Dec 25 - Thu, Jan 1
Delta Logo
6:45 am - 12:13 pmSTL-BOS
4h 28m1 stop
Delta Logo
9:00 am - 3:52 pmBOS-STL
7h 52m1 stop
$369Delta
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Tue, Jan 6 - Mon, Jan 12

Frontier flights from St. Louis to Boston

Our best Frontier deals on St. Louis to Boston flight tickets
Frontier
Dec 18
STL5:33 pmLambert-St Louis
6h 11m
1 stop
BOS12:44 amBoston Logan Intl
Jan 11
BOS11:47 amBoston Logan Intl
11h 46m
1 stop
STL10:33 pmLambert-St Louis
$296
Find similar
Frontier
Dec 12
STL6:26 pmLambert-St Louis
29h 18m
1 stop
BOS12:44 amBoston Logan Intl
Jan 11
BOS11:47 amBoston Logan Intl
11h 46m
1 stop
STL10:33 pmLambert-St Louis
$319
Find similar
Frontier
Dec 17
STL5:11 pmLambert-St Louis
30h 33m
2 stops
BOS12:44 amBoston Logan Intl
Dec 25
BOS6:00 amBoston Logan Intl
11h 33m
1 stop
STL4:33 pmLambert-St Louis
$325
Find similar

American Airlines flights from St. Louis to Boston

Our best American Airlines deals on St. Louis to Boston flight tickets
American Airlines
Nov 8
STL6:00 amLambert-St Louis
8h 30m
1 stop
BOS3:30 pmBoston Logan Intl
Nov 12
BOS9:00 amBoston Logan Intl
8h 36m
1 stop
STL4:36 pmLambert-St Louis
$311
Find similar
American Airlines
Nov 8
STL6:00 amLambert-St Louis
8h 30m
1 stop
BOS3:30 pmBoston Logan Intl
Nov 11
BOS12:02 pmBoston Logan Intl
3h 20m
STL2:22 pmLambert-St Louis
$313
Find similar
American Airlines
Nov 18
STL6:00 amLambert-St Louis
8h 03m
1 stop
BOS3:03 pmBoston Logan Intl
Nov 22
BOS12:03 pmBoston Logan Intl
3h 20m
STL2:23 pmLambert-St Louis
$314
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 October 14, 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

Fri 11/14

4:56 pm-10:48 am

1 stop16h 52m

Boston Logan Intl

Tue 11/18

12:00 pm-10:05 am

2 stops23h 05m

$295

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 12/18

5:33 pm-12:44 am

1 stop6h 11m

Boston Logan Intl

Sun 1/11

11:47 am-10:33 pm

1 stop11h 46m

$296

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 12/17

1:50 pm-5:20 pm

Nonstop2h 30m

Boston Logan Intl

Thu 12/25

9:05 am-3:50 pm

1 stop7h 45m

$307

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 12/17

10:00 am-5:15 pm

1 stop6h 15m

Boston Logan Intl

Thu 12/25

7:32 pm-11:33 pm

1 stop5h 01m

$308

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 11/8

6:00 am-3:30 pm

1 stop8h 30m

Boston Logan Intl

Wed 11/12

9:00 am-4:36 pm

1 stop8h 36m

$311

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 11/8

6:00 am-3:30 pm

1 stop8h 30m

Boston Logan Intl

Tue 11/11

12:02 pm-2:22 pm

Nonstop3h 20m

$313

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 11/1

3:59 pm-11:16 pm

1 stop6h 17m

Boston Logan Intl

Mon 11/24

8:15 am-1:00 pm

1 stop5h 45m

$334

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 12/24

11:05 am-5:17 pm

1 stop5h 12m

Boston Logan Intl

Wed 12/31

5:20 am-12:27 pm

2 stops8h 07m

$335

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 12/25

8:25 am-4:35 pm

2 stops7h 10m

Boston Logan Intl

Thu 1/1

5:35 pm-10:00 pm

1 stop5h 25m

$338

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 1/6

6:45 am-12:13 pm

1 stop4h 28m

Boston Logan Intl

Mon 1/12

9:00 am-3:52 pm

1 stop7h 52m

$369

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 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 $412.

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 Saturday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Saturday is $755.

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 afternoon. momondo users have found flights departing from St. Louis to Boston in the afternoon for as low as $430. 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 $1,035 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 $429 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 $358 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 5% 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 October 2025, prices for St. Louis to Boston flights are approximately 45% 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

$288

Fastest flight time

2h 30m

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 $288. The best round-trip flight deal from St. Louis to Boston found on momondo in the last 72 hours is $509.
The fastest flight from St. Louis to Boston takes 2h 30m
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
3,135 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $124Free CancellationRating
6.3
8,096 reviews
Search Spirit Airlines flights
DeltaPriceFrom $216Free CancellationRating
7.9
7,975 reviews
Search Delta flights
United AirlinesPriceFrom $216Free CancellationRating
7.4
8,976 reviews
Search United Airlines flights
American AirlinesPriceFrom $291Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights
SouthwestPriceFrom $305Free CancellationRating
8.0
4,238 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 $305. Generally, Southwest has 18 flights on this route every week with an average price of $454. 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 $291, 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 10 flights out of St. Louis into Boston in an average week, so prices vary by time and availability. 11,042 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
Brockton
Laconia
Falmouth
Concord
Everett
Chatham
Sturbridge

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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