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$122+ Cheap flights from St. Louis to Boston (STL - BOS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOS
Aug 31 — Sep 71
Mon 8/31
Mon 9/7
1 adult, Economy
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Find cheap flights from St. Louis to Boston with Cheapflights

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Cheapflights Tip: The best prices from Lambert-St Louis to Boston Logan Intl are usually found in September or December, booked 54 days in advance, depart on a Wednesday or Friday and return on a Wednesday

Cheap flight deals from St. Louis to Boston

Cheapest flights from St. Louis to Boston
Explore the most affordable flight options available from St. Louis to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3010:35 am
STL
-
BOS
1 stop24h 05m
Frontier
Sun 11/112:35 pm
BOS
-
STL
1 stop22h 05m
Frontier
Deal found 7/29$316
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:00 am
STL
-
BOS
Nonstop2h 35m
Southwest
Mon 8/245:50 pm
BOS
-
STL
Nonstop2h 55m
Southwest
Deal found 7/29$317
This iWofly deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/214:23 pm
STL
-
BOS
1 stop15h 46m
Frontier
Sat 8/2910:04 am
BOS
-
STL
1 stop7h 07m
Frontier
Deal found 8/1$319
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:00 pm
STL
-
BOS
Nonstop2h 47m
American Airlines
Sat 10/38:33 am
BOS
-
STL
1 stop9h 15m
American Airlines
Deal found 7/30$320
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:58 pm
STL
-
BOS
2 stops14h 49m
Frontier
Mon 8/249:36 am
BOS
-
STL
1 stop8h 46m
Frontier
Deal found 7/30$321
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:00 am
STL
-
BOS
Nonstop2h 35m
Southwest
Mon 9/145:00 am
BOS
-
STL
Nonstop2h 50m
Southwest
Deal found 7/29$322
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:10 pm
STL
-
BOS
2 stops38h 59m
Frontier
Sat 10/1011:05 am
BOS
-
STL
1 stop9h 34m
Frontier
Deal found 7/30$323
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:35 am
STL
-
BOS
2 stops21h 54m
Multiple Airlines
Fri 10/169:15 am
BOS
-
STL
1 stop11h 24m
Multiple Airlines
Deal found 7/27$324
This American Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/911:01 am
STL
-
BOS
1 stop8h 59m
American Airlines
Fri 9/116:20 am
BOS
-
STL
Nonstop3h 00m
American Airlines
Deal found 7/28$325
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/246:00 am
STL
-
BOS
1 stop5h 14m
American Airlines
Mon 8/317:09 am
BOS
-
STL
Nonstop3h 04m
American Airlines
Deal found 7/27$326
This Super.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/35:02 pm
STL
-
BOS
1 stop15h 07m
Frontier
Sun 9/69:36 am
BOS
-
STL
1 stop8h 46m
Frontier
Deal found 7/29$328

Find flight deals from St. Louis to Boston

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Boston (BOS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$316
(Kiwi.com)

One-way from

$122
(Kiwi.com)

Popular in

February

Cheapest in

September

Average price

$462

Good round-trip deal

$426 or less

Good one-way deal

$234 or less
Provider with most accurate pricing for Lambert-St Louis-Boston Logan Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Boston Logan Intl flights.
Search Deals
From Lambert-St Louis to Boston Logan Intl
Search Deals
One-way flight from Lambert-St Louis to Boston Logan Intl
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Boston Logan Intl.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Boston Logan Intl.
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated August 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
Quickest round-trip

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 8/20

7:00 am-10:35 am

Nonstop2h 35m

Boston Logan Intl

Mon 8/24

5:50 pm-7:45 pm

Nonstop2h 55m

$317

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 9/2

7:00 am-12:47 pm

1 stop4h 47m

Boston Logan Intl

Mon 9/7

7:05 am-12:02 pm

1 stop5h 57m

$337

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 8/26

6:30 am-12:15 pm

1 stop4h 45m

Boston Logan Intl

Wed 9/2

10:50 am-5:55 pm

2 stops8h 05m

$342

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 8/31

7:00 am-10:35 am

Nonstop2h 35m

Boston Logan Intl

Fri 9/25

5:50 am-11:35 am

1 stop6h 45m

$348

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 9/1

12:50 pm-9:25 pm

2 stops7h 35m

Boston Logan Intl

Fri 9/25

1:10 pm-3:00 pm

Nonstop2h 50m

$353

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 10/23

7:55 pm-11:30 pm

Nonstop2h 35m

Boston Logan Intl

Tue 10/27

5:40 pm-7:50 pm

Nonstop3h 10m

$369

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 9/15

6:40 pm-10:20 pm

Nonstop2h 40m

Boston Logan Intl

Tue 9/22

5:35 am-7:25 am

Nonstop2h 50m

$369

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 8/7

7:00 am-10:35 am

Nonstop2h 35m

Boston Logan Intl

Mon 8/10

8:55 pm-7:45 am

1 stop11h 50m

$375

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 10/1

4:30 pm-12:05 am

2 stops6h 35m

Boston Logan Intl

Thu 10/8

5:25 am-7:25 am

Nonstop3h 00m

$384

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 9/14

3:45 pm-10:25 pm

1 stop5h 40m

Boston Logan Intl

Tue 9/15

10:05 am-4:45 pm

2 stops7h 40m

$394

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Compare providers for flights from St. Louis to Boston

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Boston in August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
Super.comPrice Accuracy-Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Boston flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Boston flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Boston flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Boston flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Boston flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Boston

How far ahead should I book a flight from St. Louis to Boston?

The best time to book flights from St. Louis to Boston is 53 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from St. Louis to Boston?

Currently, September is the cheapest month in which you can book a flight from St. Louis to Boston (average of $421). Flying from St. Louis to Boston in February is currently the most expensive (average of $704). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to BOS?

Find hourly flight availability from St. Louis to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 1, 2026.

A simple way to save on the total cost of your ticket is to fly from St. Louis to Boston in the evening. If you’re flexible enough to do this you can expect to save up to 46% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from St. Louis to Boston?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Boston. Price data was last updated on July 25, 2026.

Travelers seeking maximum savings on their St. Louis to Boston flight should consider departing on Wednesday evenings when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from St. Louis to Boston?

Airfare is below average for this route at the moment.

St. Louis to Boston flights typically cost between $353 and $583 in October.
The cheapest round-trip price found within the last 5 days was $316 on Frontier (Oct 30-Nov 1).

The best insider tips for St. Louis to Boston flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Boston trip
Our travel experts
Paul Rubio

Paul Rubio

Expert on BOS

Travel journalist and photographer Paul Rubio is a Miami native (and current resident), who has lived in nine countries and traveled to 137. He is an expert in luxury travel, eco-travel, loyalty programs, hotels, airports and airlines. He is a contributing editor at AFAR, Condé Nast Traveler, LUXURY Magazine, and Palm Beach Illustrated.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Boston. Reviews last updated August 1, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from St. Louis to Boston. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,229 reviews

Comfort

8.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
Southwest
8.0
Very good
4,229 reviews
Southwest
8.0
Very good
4,229 reviews

Comfort

8.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
Delta
7.8
Good
8,497 reviews
Southwest
8.0
Very good
4,229 reviews

Comfort

8.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
United Airlines
7.4
Good
10,062 reviews
Southwest
8.0
Very good
4,229 reviews

Comfort

8.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
American Airlines
7.1
Good
11,845 reviews
Southwest
8.0
Very good
4,229 reviews

Comfort

8.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.
Frontier
5.6
Fair
2,740 reviews
Southwest
8.0
Very good
4,229 reviews

Comfort

8.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Libby,Jun 2026

TUS - LAS

One delay in a 2 layover flight=a good trip. The crew was great.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Boston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from St. Louis to Boston?

    Booking a flight from Lambert-St Louis (STL) to Boston Logan Intl (BOS) is your only option if you wish to fly from St. Louis to Boston. On a typical day, there are 4 flights from Lambert-St Louis to Logan Intl, all of which are around 2h 25m for a nonstop flight. You can also purchase a plane ticket from 6 airlines when you book a flight from Lambert-St Louis to Boston.

  • How popular is this St. Louis to Boston flight route?

    The Lambert-St Louis to Boston Logan Intl flight path was viewed by 20 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from St. Louis to Boston?

    There are many flights that can get you from St. Louis to Boston in 2h 35m. Fly via Southwest or United Airlines to get the fastest option. St. Louis and Boston are separated by a distance of 1043 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from St. Louis to Boston round-trip?

    According to our current data, Frontier ($155), Delta ($216), and United Airlines ($254) offers the cheapest pricing from St. Louis to Boston. Users have found that Frontier is 68% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from St. Louis to Boston one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $80. Southwest flights start at $158 while deals on American Airlines start at $164 one-way.

  • What are the most reliable airlines from St. Louis to Boston?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Boston consider choosing Qatar Airways (86%), Iberia (82%) or British Airways (73%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Boston?

    While on average a flight from St. Louis to Boston is generally $556, our data shows the cheapest flight currently is $144. When looking at the most popular route, (Lambert-St Louis - Boston Logan Intl), you can expect to pay $272 for that flight.

  • Can I find deals for flights from St. Louis to Boston that include hotel bookings?

    Yes. In addition to deals on St. Louis to Boston flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Boston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Boston.

  • Can I find deals for business class flights from St. Louis to Boston?

    Yes. Cheapflights offers flight deals from St. Louis to Boston by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Boston?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Boston (average of $421). Flying from St. Louis to Boston in February is currently the most expensive (average of $704). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Waltham
Cambridge
Concord
Randolph
Brockton
Seekonk
Hampton Beach
Cranston
Warwick
Peabody
Dedham
Auburn
York Beach
Chelsea
Londonderry
Swansea
Fitchburg
North Falmouth
Braintree
Revere

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from St. Louis to Boston

Discover the top 6 airlines that operate flights from St. Louis to Boston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$155Average$270FlexibilityNo cancel feeOn-time62%
DeltaCheapest$216Average$345FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$254Average$477FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$285Average$468FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$316Average$438FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$336Average$513FlexibilityNo cancel feeOn-time63%

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