Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Boston from $92

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 5/25. 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.

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.
Frontier Logo
5:35 pm - 9:56 amSTL-BOS
15h 21m1 stop
Frontier Logo
10:51 am - 11:37 pmBOS-STL
13h 46m1 stop
$201Frontier
Find Deal
Thu, Jun 5 - Mon, Jun 9
 Logo
10:10 am - 11:29 pmSTL-BOS
12h 19m1 stop
 Logo
6:00 am - 12:06 amBOS-STL
19h 06m1 stop
Sat, May 10 - Mon, May 12
American Airlines Logo
6:00 am - 3:10 pmSTL-BOS
8h 10m1 stop
American Airlines Logo
6:30 am - 8:40 amBOS-STL
3h 10mnonstop
$270American Airlines
Find Deal
Wed, May 21 - Tue, May 27
American Airlines Logo
6:00 am - 3:10 pmSTL-BOS
8h 10m1 stop
American Airlines Logo
6:30 am - 8:40 amBOS-STL
3h 10mnonstop
$273American Airlines
Find Deal
Wed, May 21 - Mon, May 26
Delta Logo
7:06 pm - 1:17 amSTL-BOS
5h 11m1 stop
Delta Logo
8:00 am - 12:04 pmBOS-STL
5h 04m1 stop
$293Delta
Find Deal
Mon, May 19 - Tue, May 20
Delta Logo
6:45 am - 12:01 pmSTL-BOS
4h 16m1 stop
Delta Logo
6:00 am - 12:25 pmBOS-STL
7h 25m1 stop
$302Delta
Find Deal
Sat, Sep 6 - Mon, Sep 8
United Airlines Logo
8:10 am - 12:59 amSTL-BOS
15h 49m1 stop
United Airlines Logo
12:29 pm - 10:45 pmBOS-STL
11h 16m2 stops
$348United Airlines
Find Deal
Thu, Jun 12 - Wed, Jun 18
Southwest Logo
8:25 pm - 11:55 pmSTL-BOS
2h 30mnonstop
Southwest Logo
7:20 pm - 11:20 pmBOS-STL
5h 00m1 stop
$353Southwest
Find Deal
Thu, Jun 5 - Mon, Jun 9
Southwest Logo
7:40 pm - 11:10 pmSTL-BOS
2h 30mnonstop
Southwest Logo
5:45 am - 11:35 amBOS-STL
6h 50m2 stops
$358Southwest
Find Deal
Tue, Jun 24 - Wed, Jun 25
United Airlines Logo
6:30 am - 12:48 pmSTL-BOS
5h 18m1 stop
United Airlines Logo
5:30 am - 2:47 pmBOS-STL
10h 17m2 stops
$378United Airlines
Find Deal
Tue, May 13 - Thu, May 15

Southwest flights from St. Louis to Boston

Our best Southwest deals on St. Louis to Boston flight tickets
Southwest
Jun 5
STL8:25 pmLambert-St Louis
2h 30m
BOS11:55 pmBoston Logan Intl
Jun 9
BOS7:20 pmBoston Logan Intl
5h 00m
1 stop
STL11:20 pmLambert-St Louis
Southwest
Jun 24
STL7:40 pmLambert-St Louis
2h 30m
BOS11:10 pmBoston Logan Intl
Jun 25
BOS5:45 amBoston Logan Intl
6h 50m
2 stops
STL11:35 amLambert-St Louis
Southwest
Sep 6
STL5:55 pmLambert-St Louis
2h 35m
BOS9:30 pmBoston Logan Intl
Sep 8
BOS7:10 amBoston Logan Intl
2h 55m
STL9:05 amLambert-St Louis

American Airlines flights from St. Louis to Boston

Our best American Airlines deals on St. Louis to Boston flight tickets
American Airlines
May 21
STL6:00 amLambert-St Louis
8h 10m
1 stop
BOS3:10 pmBoston Logan Intl
May 27
BOS6:30 amBoston Logan Intl
3h 10m
STL8:40 amLambert-St Louis
American Airlines
May 21
STL6:00 amLambert-St Louis
8h 10m
1 stop
BOS3:10 pmBoston Logan Intl
May 26
BOS6:30 amBoston Logan Intl
3h 10m
STL8:40 amLambert-St Louis
American Airlines
May 28
STL6:00 amLambert-St Louis
8h 10m
1 stop
BOS3:10 pmBoston Logan Intl
May 30
BOS11:46 amBoston Logan Intl
3h 04m
STL1:50 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 $381. 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 $382.

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 11 weeks ahead of your departure date. In general, you can expect to find flights to Boston for around $420 when searching 11 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 $349 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

$92

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 $92. The best round-trip flight deal from St. Louis to Boston found on momondo in the last 72 hours is $201.
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
3,283 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $168Free CancellationRating
6.3
7,940 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $196Free CancellationRating
7.4
8,683 reviews
Search United Airlines flights
DeltaPriceFrom $196Free CancellationRating
8.0
7,920 reviews
Search Delta flights
American AirlinesPriceFrom $285Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $317Free CancellationRating
8.0
4,287 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 $317. Generally, Southwest has 15 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 $285, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $426 round-trip. American Airlines operates 12 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
York Beach
Plymouth
Cambridge
Brockton
Laconia
Concord
Everett
Warwick
Middletown
Narragansett
Wells
Kennebunkport
Revere
Gloucester

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
From?
To?
Mon 4/28
Mon 5/5

Find better results for your trip to the United States