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Cheap flights from St. Louis to Boston from $86

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 5/10. 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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Find the cheapest flights from St. Louis to Boston

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from St. Louis to Boston.
 Logo
10:10 am - 11:29 pmSTL-BOS
12h 19m1 stop
 Logo
8:00 am - 11:44 pmBOS-STL
16h 44m1 stop
Thu, May 8 - Tue, May 20
 Logo
10:10 am - 11:29 pmSTL-BOS
12h 19m1 stop
 Logo
9:40 am - 11:49 pmBOS-STL
15h 09m1 stop
Thu, May 29 - Mon, Jun 2
Frontier Logo
4:57 pm - 12:47 amSTL-BOS
6h 50m1 stop
Frontier Logo
6:00 am - 12:04 amBOS-STL
19h 04m1 stop
$250Frontier
Find Deal
Thu, Apr 17 - Tue, Apr 22
Southwest Logo
7:00 pm - 10:30 pmSTL-BOS
2h 30mnonstop
Southwest Logo
7:05 am - 9:00 amBOS-STL
2h 55mnonstop
$303Southwest
Find Deal
Tue, Apr 29 - Wed, Jun 4
Delta Logo
12:55 pm - 8:26 pmSTL-BOS
6h 31m1 stop
Delta Logo
5:30 am - 9:28 amBOS-STL
4h 58m1 stop
$304Delta
Find Deal
Mon, Apr 14 - Sun, Apr 20
Frontier Logo
4:57 pm - 12:59 amSTL-BOS
7h 02m1 stop
Frontier Logo
6:00 am - 11:46 pmBOS-STL
18h 46m1 stop
$310Frontier
Find Deal
Fri, Apr 18 - Mon, Apr 21
Southwest Logo
7:00 pm - 10:30 pmSTL-BOS
2h 30mnonstop
Southwest Logo
5:50 am - 11:50 amBOS-STL
7h 00m1 stop
$313Southwest
Find Deal
Tue, Apr 29 - Wed, Jun 4
American Airlines Logo
6:00 am - 3:24 pmSTL-BOS
8h 24m1 stop
American Airlines Logo
3:40 pm - 5:53 pmBOS-STL
3h 13mnonstop
$336American Airlines
Find Deal
Tue, Jul 1 - Wed, Jul 9
American Airlines Logo
9:08 am - 3:29 pmSTL-BOS
5h 21m1 stop
American Airlines Logo
6:30 am - 8:40 amBOS-STL
3h 10mnonstop
$337American Airlines
Find Deal
Sat, May 24 - Tue, May 27
Delta Logo
3:40 pm - 10:50 pmSTL-BOS
6h 10m1 stop
Delta Logo
11:00 am - 3:08 pmBOS-STL
5h 08m1 stop
$347Delta
Find Deal
Sat, May 24 - Tue, May 27

Spirit Airlines flights from St. Louis to Boston

Our best Spirit Airlines deals on St. Louis to Boston flight tickets
Spirit Airlines
Apr 29
STL6:10 pmLambert-St Louis
28h 36m
2 stops
BOS11:46 pmBoston Logan Intl
Jun 4
BOS3:49 pmBoston Logan Intl
18h 26m
1 stop
STL9:15 amLambert-St Louis
Spirit Airlines
Apr 29
STL6:10 pmLambert-St Louis
15h 12m
1 stop
BOS10:22 amBoston Logan Intl
Jun 4
BOS3:49 pmBoston Logan Intl
18h 26m
1 stop
STL9:15 amLambert-St Louis
Spirit Airlines
Apr 29
STL6:10 pmLambert-St Louis
23h 04m
3 stops
BOS6:14 pmBoston Logan Intl
Jun 4
BOS3:49 pmBoston Logan Intl
18h 26m
1 stop
STL9:15 amLambert-St Louis

Frontier flights from St. Louis to Boston

Our best Frontier deals on St. Louis to Boston flight tickets
Frontier
Apr 12
STL4:57 pmLambert-St Louis
6h 50m
1 stop
BOS12:47 amBoston Logan Intl
Apr 15
BOS6:00 amBoston Logan Intl
18h 46m
1 stop
STL11:46 pmLambert-St Louis
Frontier
Apr 17
STL4:57 pmLambert-St Louis
6h 50m
1 stop
BOS12:47 amBoston Logan Intl
Apr 22
BOS6:00 amBoston Logan Intl
19h 04m
1 stop
STL12:04 amLambert-St Louis
Frontier
Apr 10
STL4:57 pmLambert-St Louis
6h 50m
1 stop
BOS12:47 amBoston Logan Intl
Apr 12
BOS6:00 amBoston Logan Intl
18h 46m
1 stop
STL11:46 pmLambert-St Louis

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, August 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 $380. If you aren’t able to travel during the month of August, then book flights to Boston from St. Louis during September instead. Flights to Boston in September, while not as cheap as those in August, still average around $380.

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 Thursday when prices can be found for as low as $500. 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 $964.

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 $416. 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 $1,079 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 13 weeks ahead of your departure date. In general, you can expect to find flights to Boston for around $419 when searching 13 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 $361 on momondo.

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

There are 4 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.

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

As of April 2025, prices for St. Louis to Boston flights are approximately 25% 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

$86

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 $86. The best round-trip flight deal from St. Louis to Boston found on momondo in the last 72 hours is $208.
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)

  • 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 $94Free CancellationRating
5.9
3,277 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $168Free CancellationRating
6.3
7,890 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $196Free CancellationRating
7.4
8,619 reviews
Search United Airlines flights
DeltaPriceFrom $196Free CancellationRating
8.0
7,897 reviews
Search Delta flights
American AirlinesPriceFrom $284Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $315Free CancellationRating
8.0
4,275 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 $315. Generally, Southwest has 6 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 $284, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $425 round-trip. American Airlines operates 4 flights out of St. Louis into Boston 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 Boston?

Book flights to Boston if you plan to visit one of these locations
Hampton Beach
Salem
Ogunquit
Hampton
Old Orchard Beach
Nashua
Cambridge
Plymouth
Brockton
York Beach
Laconia
Concord
Everett
Warwick
Middletown
Wells
Revere
Kennebunkport
Gloucester
Narragansett

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.


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