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$68+ Cheap flights from Boston to St. Louis (BOS - STL)

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — STL
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
1 adult, Economy
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Find cheap flights from Boston to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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Cheapflights Tip: The best prices from Boston Logan Intl to Lambert-St Louis are usually found in January or August, booked 47 days in advance, depart on a Wednesday or Thursday and return on a Friday

Cheap flight deals from Boston to St. Louis

Cheapest flights from Boston to St. Louis
Explore the most affordable flight options available from Boston to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 9, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/8. 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.
Sat 12/138:11 pmBOS - STL
2 stops18h 41mMultiple Airlines
Sun 12/2110:57 amSTL - BOS
1 stop21h 45mMultiple Airlines
Deal found 12/8$334
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/3010:56 amBOS - STL
2 stops24h 06mMultiple Airlines
Tue 1/65:11 pmSTL - BOS
1 stop15h 50mMultiple Airlines
Deal found 12/8$336
This Kiwi.com deal was found by Cheapflights users on 12/7. 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 12/1812:22 pmBOS - STL
1 stop11h 11mFrontier
Sat 12/274:27 pmSTL - BOS
1 stop17h 14mFrontier
Deal found 12/7$339
This Flightnetwork deal was found by Cheapflights users on 12/8. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1212:17 pmBOS - STL
1 stop11h 16mFrontier
Sat 12/133:30 pmSTL - BOS
1 stop16h 57mFrontier
Deal found 12/8$340
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/3112:29 pmBOS - STL
1 stop11h 04mMultiple Airlines
Mon 1/57:43 pmSTL - BOS
2 stops14h 51mMultiple Airlines
Deal found 12/8$344
This Kiwi.com deal was found by Cheapflights users on 12/7. 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 12/2411:09 amBOS - STL
1 stop23h 31mFrontier
Wed 1/77:43 pmSTL - BOS
2 stops13h 28mFrontier
Deal found 12/7$349
This Kiwi.com deal was found by Cheapflights users on 12/7. 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.
Sat 12/2011:37 amBOS - STL
1 stop23h 03mFrontier
Sat 1/178:32 pmSTL - BOS
1 stop27h 41mFrontier
Deal found 12/7$356
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/98:11 pmBOS - STL
1 stop27h 22mMultiple Airlines
Tue 12/163:30 pmSTL - BOS
1 stop17h 31mMultiple Airlines
Deal found 12/8$359
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/3010:56 amBOS - STL
2 stops24h 06mMultiple Airlines
Thu 1/83:43 pmSTL - BOS
1 stop8h 36mMultiple Airlines
Deal found 12/8$360
This Frontier deal was found by Cheapflights users on 12/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3012:08 pmBOS - STL
1 stop11h 25mFrontier
Thu 1/83:43 pmSTL - BOS
1 stop8h 36mFrontier
Deal found 12/8$362
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/3010:56 amBOS - STL
2 stops24h 06mMultiple Airlines
Wed 1/75:11 pmSTL - BOS
1 stop20h 27mMultiple Airlines
Deal found 12/8$364

Find flight deals from Boston to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to St. Louis (STL). 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 December 9, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$324
(American Airlines)

One-way from

$68
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$450

Good round-trip deal

$383 or less

Good one-way deal

$184 or less
Provider with most accurate pricing for Boston Logan Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Lambert-St Louis flights.
Search Deals
From Boston Logan Intl to Lambert-St Louis
Search Deals
One-way flight from Boston Logan Intl to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($41 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Boston Logan Intl to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Boston Logan Intl to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to St. Louis 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 December 9, 2025.
Use the filters below to find and compare flights from Boston to St. Louis that are best for you.

Fly from

Boston

Fly to

St. Louis

Route

Depart

Return

Price

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 1/2

12:29 pm-10:33 pm

1 stop11h 04m

Lambert-St Louis

Wed 1/21

8:22 pm-1:13 am

1 stop27h 51m

$331

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 1/2

12:29 pm-10:33 pm

1 stop11h 04m

Lambert-St Louis

Fri 1/16

5:11 pm-11:10 am

1 stop16h 59m

$347

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 1/9

6:25 am-8:45 am

Nonstop3h 20m

Lambert-St Louis

Tue 1/13

5:55 pm-9:25 pm

Nonstop2h 30m

$396

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 1/22

6:25 am-8:45 am

Nonstop3h 20m

Lambert-St Louis

Sun 1/25

7:50 am-11:20 am

Nonstop2h 30m

$414

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 12/31

1:04 pm-5:00 pm

1 stop4h 56m

Lambert-St Louis

Sat 1/3

6:29 am-11:59 am

1 stop4h 30m

$417

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 12/30

7:00 am-11:18 am

1 stop5h 18m

Lambert-St Louis

Wed 12/31

5:55 pm-11:14 pm

1 stop4h 19m

$417

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 1/3

6:00 am-11:18 am

1 stop6h 18m

Lambert-St Louis

Sat 1/17

5:00 pm-1:04 am

1 stop7h 04m

$417

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 2/28

5:29 am-9:32 am

1 stop5h 03m

Lambert-St Louis

Sat 2/28

5:00 pm-7:30 am

2 stops13h 30m

$424

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sun 2/8

3:20 pm-9:55 pm

2 stops7h 35m

Lambert-St Louis

Tue 2/10

2:15 pm-10:05 pm

2 stops6h 50m

$426

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 1/8

6:00 am-2:30 pm

1 stop9h 30m

Lambert-St Louis

Mon 1/12

8:05 am-7:39 pm

1 stop10h 34m

$427

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 18 results
1
2

Compare providers for flights from Boston to St. Louis

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 Boston to St. Louis in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 Boston-St. Louis flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Boston-St. Louis flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Boston-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-St. Louis flights, Cheapflights users trust eDreams the most. eDreams 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 Boston-St. Louis 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 Boston to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Boston 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 Boston to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from Boston to St. Louis. Price data was last updated on December 5, 2025.

To ensure you get the cheapest price possible for a flight from Boston to St. Louis, you should look to book at least 47 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, December is the cheapest month in which you can book a flight from Boston to St. Louis (average of $107). Flying from Boston to St. Louis in July is currently the most expensive (average of $300). 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 BOS to STL?

Find hourly flight availability from Boston to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 9, 2025.

It’s typically best to fly out from Boston to St. Louis in the evening. Doing so could potentially save you 5% on the flight price compared to flying at noon, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from Boston to St. Louis. Price data was last updated on December 6, 2025.

Travelers seeking maximum savings on their Boston to St. Louis flight should consider departing on Monday 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.

The best insider tips for Boston to St. Louis 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 Boston to St. Louis trip
Airports
BOS

Use the FlyLogan App to pre-order food and save time at BOS. Most restaurants participate, making it a convenient option.

Read more about BOSBy Paul Rubio
STL

Take the MetroLink light rail from STL to downtown St. Louis. It's affordable and takes about 40 minutes, ideal for light luggage.

Read more about STLBy Taryn White
Our travel experts
Paul Rubio

Paul Rubio

Expert on BOS

Paul Rubio

Paul Rubio

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

Taryn White

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 St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated December 9, 2025.
Read through reviews of airlines operating flights from Boston to St. Louis, such as Southwest, Delta, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,254 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,011 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,045 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Spirit Airlines
6.3
Okay
8,168 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,085 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Boston to St. Louis. 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 Boston to St. Louis?

    If you wish to fly to St. Louis from Boston, then you need to book flights from Boston Logan Intl to Lambert-St Louis. There are 4 flights from Logan Intl (BOS) to Lambert-St Louis (STL) per day to choose from. Flights to St. Louis from Logan Intl are available from 6 different airlines, which means you should have some options if you want to compare airfare deals. 3h 00m is how long a nonstop flight from Boston to Lambert-St Louis typically takes.

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

    Flights from Boston Logan Intl to Lambert-St Louis have been viewed 52 times in the past calendar month.

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

    Airlines like Southwest and Delta fly from Boston to St. Louis in about 3h 20m. The time it takes to get you to your destination can typically vary by up to 1h 36m. The distance between Boston and St. Louis is about 1043 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Cheapflights users have booked flights from Boston to St. Louis round-trip from $63. Other airlines that can offer you cheap pricing are Frontier, from $90, and Delta, from $161. Spirit Airlines is priced at 85% lower than the current average price of a flight leaving 3 months from now.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $65. However, be on the lookout for offers from Spirit Airlines and Delta, as they are both options that can get you from Boston to St. Louis for a low price.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Boston to St. Louis on time: Iberia (100%), Republic Airways (100%), American Airlines (81%).

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

    Looking at all options, your cheapest flight can be booked for $105. While the most popular route (Boston Logan Intl - Lambert-St Louis) can be booked for $161 on average, our data indicates $356 when flying from Boston to St. Louis.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Boston to St. Louis 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 Boston to St. Louis?

    Currently, December is the cheapest month in which you can book a flight from Boston to St. Louis (average of $107). Flying from Boston to St. Louis in July is currently the most expensive (average of $300). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Swansea
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Boston to St. Louis

Discover the top 6 airlines that operate flights from Boston to St. Louis. 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 December 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$83Average$147FlexibilityNo cancel feeOn-time65%
FrontierCheapest$90Average$283FlexibilityNo cancel feeOn-time62%
DeltaCheapest$216Average$317FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$292Average$406FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$297Average$453FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$322Average$468FlexibilityNo cancel feeOn-time63%

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