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$80+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOS
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Boston Logan Intl are usually found in September or August, 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 March 23, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/21. 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.
Tue 5/266:33 pm
STL
-
BOS
2 stops15h 33m
Frontier
Thu 6/49:12 am
BOS
-
STL
1 stop9h 21m
Frontier
Deal found 3/21$335
This Expedia deal was found by Cheapflights users on 3/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/76:33 pm
STL
-
BOS
1 stop12h 16m
Frontier
Thu 6/119:12 am
BOS
-
STL
1 stop9h 18m
Frontier
Deal found 3/23$336
This Delta deal was found by Cheapflights users on 3/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:25 am
STL
-
BOS
1 stop5h 20m
Delta
Tue 4/285:35 am
BOS
-
STL
1 stop5h 59m
Delta
Deal found 3/20$337
This Kiwi.com deal was found by Cheapflights users on 3/19. 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.
Mon 4/68:19 pm
STL
-
BOS
2 stops16h 36m
Multiple Airlines
Thu 4/95:30 am
BOS
-
STL
1 stop13h 04m
Multiple Airlines
Deal found 3/19$340
This Kiwi.com deal was found by Cheapflights users on 3/20. 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.
Tue 4/144:59 pm
STL
-
BOS
1 stop16h 22m
Frontier
Wed 5/1310:07 am
BOS
-
STL
2 stops29h 41m
Frontier
Deal found 3/20$341
This Southwest deal was found by Cheapflights users on 3/20. 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.
Tue 4/145:35 am
STL
-
BOS
2 stops7h 10m
Southwest
Wed 5/1310:45 am
BOS
-
STL
1 stop5h 20m
Southwest
Deal found 3/20$342
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Tue 6/26:33 pm
STL
-
BOS
1 stop12h 16m
Multiple Airlines
Sat 6/64:42 pm
BOS
-
STL
2 stops41h 13m
Multiple Airlines
Deal found 3/22$343
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
Tue 4/144:59 pm
STL
-
BOS
1 stop16h 22m
Multiple Airlines
Thu 4/162:18 pm
BOS
-
STL
2 stops17h 32m
Multiple Airlines
Deal found 3/18$344
This American Airlines deal was found by Cheapflights users on 3/19. 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.
Sat 5/165:51 am
STL
-
BOS
1 stop7h 35m
American Airlines
Tue 5/265:11 pm
BOS
-
STL
Nonstop3h 10m
American Airlines
Deal found 3/19$345
This Southwest deal was found by Cheapflights users on 3/23. 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.
Sat 5/235:35 pm
STL
-
BOS
1 stop5h 05m
Southwest
Wed 5/277:35 am
BOS
-
STL
2 stops8h 40m
Southwest
Deal found 3/23$346
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 5/18:23 pm
STL
-
BOS
1 stop11h 53m
Frontier
Sun 5/312:31 pm
BOS
-
STL
2 stops19h 19m
Frontier
Deal found 3/18$348

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 March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$335
(Frontier)

One-way from

$80
(Priceline)

Popular in

February

Cheapest in

September

Average price

$472

Good round-trip deal

$447 or less

Good one-way deal

$275 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. 13% potential increase in price ($72 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 23, 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 5/1

7:40 pm-11:10 pm

Nonstop2h 30m

Boston Logan Intl

Tue 5/12

9:15 am-3:15 pm

1 stop7h 00m

$364

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 4/22

6:30 am-12:46 pm

1 stop5h 16m

Boston Logan Intl

Sat 4/25

10:05 am-9:52 pm

2 stops12h 47m

$440

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 4/11

6:32 am-12:31 pm

1 stop4h 59m

Boston Logan Intl

Sun 4/12

5:30 am-9:46 am

1 stop5h 16m

$455

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 5/16

2:25 pm-11:40 pm

2 stops8h 15m

Boston Logan Intl

Sun 5/24

1:20 pm-7:00 pm

2 stops6h 40m

$456
Quickest round-trip

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 5/29

7:40 pm-11:10 pm

Nonstop2h 30m

Boston Logan Intl

Sun 5/31

5:40 am-7:40 am

Nonstop3h 00m

$461

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 4/30

5:40 am-10:55 am

1 stop4h 15m

Boston Logan Intl

Sun 5/3

5:40 am-7:40 am

Nonstop3h 00m

$471

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 6/17

1:15 pm-4:50 pm

Nonstop2h 35m

Boston Logan Intl

Tue 6/23

5:35 am-2:50 pm

2 stops10h 15m

$476

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 5/2

1:45 pm-5:20 pm

Nonstop2h 35m

Boston Logan Intl

Sun 5/3

5:30 am-12:05 pm

2 stops7h 35m

$476

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 6/12

4:35 pm-12:05 am

2 stops6h 30m

Boston Logan Intl

Sun 6/21

5:50 am-7:45 am

Nonstop2h 55m

$476

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 6/5

5:15 pm-1:28 am

1 stop7h 13m

Boston Logan Intl

Sun 6/7

5:30 am-9:32 am

1 stop5h 02m

$481

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/18

Showing 1-10 of 23 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 March.
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

*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?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Boston. Price data was last updated on March 13, 2026.

The best time to book flights from St. Louis to Boston is 54 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 $185). Flying from St. Louis to Boston in February is currently the most expensive (average of $377). 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 March 23, 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 54% 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 March 14, 2026.

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

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 March 23, 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
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,324 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,319 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,462 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,488 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Spirit Airlines
6.3
Okay
8,538 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 6 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 17 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 30m. Fly via Southwest, United Airlines, or Delta 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, Spirit Airlines ($73), Frontier ($100), and Delta ($153) offers the cheapest pricing from St. Louis to Boston. Users have found that Spirit Airlines is 84% 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 Spirit Airlines, which is currently one of the cheapest options available, starting at $70. Frontier flights start at $120 while deals on American Airlines start at $156 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 British Airways (69%), Southwest (68%) or Iberia (68%) 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 $875, our data shows the cheapest flight currently is $170. When looking at the most popular route, (Lambert-St Louis - Boston Logan Intl), you can expect to pay $286 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 $185). Flying from St. Louis to Boston in February is currently the most expensive (average of $377). 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
Medford
Cambridge
Concord
Hampton Beach
Watertown
Seekonk
Brockton
Seabrook
Cranston
Chelsea
Smithfield
Lincoln
Warwick
Peabody
Waltham
York Beach
Londonderry
Swansea
Old Orchard Beach
Quincy

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 March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$73Average$249FlexibilityNo cancel feeOn-time65%
FrontierCheapest$75Average$260FlexibilityNo cancel feeOn-time62%
DeltaCheapest$153Average$292FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$254Average$456FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$272Average$441FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$304Average$465FlexibilityNo cancel feeOn-time63%

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