Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Boston from $79

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 5/8. 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.
Frontier Logo
5:27 pm - 1:24 am
STL
-
BOS
6h 57m
1 stop
Frontier Logo
6:00 am - 4:54 pm
BOS
-
STL
11h 54m
1 stop
$160Frontier
Fri, May 8 - Sun, May 10
Frontier Logo
5:27 pm - 1:24 am
STL
-
BOS
6h 57m
1 stop
Frontier Logo
6:00 am - 4:54 pm
BOS
-
STL
11h 54m
1 stop
$180Frontier
Fri, May 15 - Sun, May 17
Frontier Logo
5:27 pm - 1:24 am
STL
-
BOS
6h 57m
1 stop
Frontier Logo
6:00 am - 5:33 pm
BOS
-
STL
12h 33m
1 stop
$185Frontier
Fri, May 15 - Sun, May 24
Frontier Logo
5:27 pm - 1:24 am
STL
-
BOS
6h 57m
1 stop
Frontier Logo
6:00 am - 5:30 pm
BOS
-
STL
12h 30m
1 stop
$200Frontier
Sat, May 30 - Tue, Jun 9
Frontier Logo
5:27 pm - 1:24 am
STL
-
BOS
6h 57m
1 stop
Frontier Logo
9:12 am - 5:33 pm
BOS
-
STL
9h 21m
1 stop
$201Frontier
Sat, May 16 - Tue, May 26
Frontier Logo
6:55 pm - 7:49 am
STL
-
BOS
11h 54m
1 stop
Frontier Logo
6:00 am - 5:33 pm
BOS
-
STL
12h 33m
1 stop
$205Frontier
Thu, May 14 - Sun, May 24
Frontier Logo
6:33 pm - 1:24 am
STL
-
BOS
5h 51m
1 stop
Frontier Logo
6:00 am - 5:33 pm
BOS
-
STL
12h 33m
1 stop
$221Frontier
Thu, Jun 4 - Sun, Jun 7
Frontier Logo
6:33 pm - 7:49 am
STL
-
BOS
12h 16m
1 stop
Frontier Logo
6:00 am - 5:33 pm
BOS
-
STL
12h 33m
1 stop
$225Frontier
Thu, May 21 - Tue, May 26
Frontier Logo
6:33 pm - 7:52 am
STL
-
BOS
12h 19m
1 stop
Frontier Logo
6:00 am - 5:30 pm
BOS
-
STL
12h 30m
1 stop
$230Frontier
Tue, Jun 23 - Sun, Jun 28
Frontier Logo
6:29 pm - 1:26 am
STL
-
BOS
5h 57m
1 stop
Frontier Logo
5:30 am - 10:38 am
BOS
-
STL
6h 08m
1 stop
$242Frontier
Thu, Apr 9 - Sun, Apr 12

Frontier flights from St. Louis to Boston

Our best Frontier deals on St. Louis to Boston flight tickets
Frontier
May 8
STL5:27 pmLambert-St Louis
6h 57m
1 stop
BOS1:24 amBoston Logan Intl
May 10
BOS6:00 amBoston Logan Intl
11h 54m
1 stop
STL4:54 pmLambert-St Louis
$160
Frontier
May 15
STL5:27 pmLambert-St Louis
6h 57m
1 stop
BOS1:24 amBoston Logan Intl
May 17
BOS6:00 amBoston Logan Intl
11h 54m
1 stop
STL4:54 pmLambert-St Louis
$180
Frontier
May 15
STL5:27 pmLambert-St Louis
6h 57m
1 stop
BOS1:24 amBoston Logan Intl
May 24
BOS6:00 amBoston Logan Intl
12h 33m
1 stop
STL5:33 pmLambert-St Louis
$185

Southwest flights from St. Louis to Boston

Our best Southwest deals on St. Louis to Boston flight tickets
Southwest
May 23
STL6:55 pmLambert-St Louis
2h 30m
BOS10:25 pmBoston Logan Intl
May 27
BOS10:45 amBoston Logan Intl
5h 20m
1 stop
STL3:05 pmLambert-St Louis
$345
Southwest
May 13
STL6:50 pmLambert-St Louis
2h 30m
BOS10:20 pmBoston Logan Intl
May 16
BOS6:00 amBoston Logan Intl
3h 05m
STL8:05 amLambert-St Louis
$353
Southwest
Apr 10
STL10:15 amLambert-St Louis
2h 35m
BOS1:50 pmBoston Logan Intl
Apr 13
BOS11:35 amBoston Logan Intl
2h 55m
STL1:30 pmLambert-St Louis
$571

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 April 1, 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

Cheapest round-trip

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 5/8

5:27 pm-1:24 am

1 stop6h 57m

Boston Logan Intl

Sun 5/10

6:00 am-4:54 pm

1 stop11h 54m

$160

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 5/15

5:27 pm-1:24 am

1 stop6h 57m

Boston Logan Intl

Sun 5/17

6:00 am-4:54 pm

1 stop11h 54m

$180

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 5/15

5:27 pm-1:24 am

1 stop6h 57m

Boston Logan Intl

Sun 5/24

6:00 am-5:33 pm

1 stop12h 33m

$185

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 5/30

5:27 pm-1:24 am

1 stop6h 57m

Boston Logan Intl

Tue 6/9

6:00 am-5:30 pm

1 stop12h 30m

$200

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 5/16

5:27 pm-1:24 am

1 stop6h 57m

Boston Logan Intl

Tue 5/26

9:12 am-5:33 pm

1 stop9h 21m

$201

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 5/14

6:55 pm-7:49 am

1 stop11h 54m

Boston Logan Intl

Sun 5/24

6:00 am-5:33 pm

1 stop12h 33m

$205

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 6/4

6:33 pm-1:24 am

1 stop5h 51m

Boston Logan Intl

Sun 6/7

6:00 am-5:33 pm

1 stop12h 33m

$221

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 5/21

6:33 pm-7:49 am

1 stop12h 16m

Boston Logan Intl

Tue 5/26

6:00 am-5:33 pm

1 stop12h 33m

$225

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 6/23

6:33 pm-7:52 am

1 stop12h 19m

Boston Logan Intl

Sun 6/28

6:00 am-5:30 pm

1 stop12h 30m

$230
Quickest round-trip

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 4/9

6:29 pm-1:26 am

1 stop5h 57m

Boston Logan Intl

Sun 4/12

5:30 am-10:38 am

1 stop6h 08m

$242

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 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 Wednesday when prices can be found for as low as $478. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Boston on Sunday is $707.

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 $441. 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 $968 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 $462 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 $348 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?

No. A direct flight is the cheapest option for a flight between St. Louis to Boston.

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

As of April 2026, prices for St. Louis to Boston flights are approximately 11% 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

$260

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 $260. The best round-trip flight deal from St. Louis to Boston found on momondo in the last 72 hours is $464.
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
Spirit AirlinesPriceFrom $73Free CancellationRating
6.3
8,573 reviews
Search Spirit Airlines flights
FrontierPriceFrom $125Free CancellationRating
5.7
3,006 reviews
Search Frontier flights
DeltaPriceFrom $153Free CancellationRating
7.9
8,367 reviews
Search Delta flights
American AirlinesPriceFrom $272Free CancellationRating
7.1
11,545 reviews
Search American Airlines flights
United AirlinesPriceFrom $276Free CancellationRating
7.4
9,530 reviews
Search United Airlines flights
SouthwestPriceFrom $304Free CancellationRating
8.0
4,336 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 10 flights on this route every week with an average price of $469. 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 $272, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $441 round-trip. American Airlines operates 6 flights out of St. Louis into Boston in an average week, so prices vary by time and availability. 11,545 American Airlines reviews by users on momondo have scored the airline at 7.1/10.

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
Kennebunkport
Plymouth
Cambridge
South Yarmouth
Narragansett
Gloucester
Falmouth
Brockton
Warwick
Chatham
Laconia
Sturbridge
Nashua
Everett

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
Fri 5/1
Fri 5/8
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States