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$116+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — STL
mar. 8 — mar. 151
sáb. 3/8
sáb. 3/15
1 adult, Economy
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The best prices from Boston Logan Intl to Lambert-St Louis are usually found in September or August, booked 63 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap 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 marzo 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$322
(United)

One-way from

$116
(Mytrip)

Popular in

March

Cheapest in

September

Average price

$461

Good round-trip deal

$403 or less

Good one-way deal

$196 or less
Provider with most accurate pricing for Boston Logan Intl-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Boston Logan Intl-Lambert-St Louis flights.
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From Boston Logan Intl to Lambert-St Louis
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One-way flight from Boston Logan Intl to Lambert-St Louis
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Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Boston Logan Intl to Lambert-St Louis.
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Price to beat on a one-way flight from Boston Logan Intl to Lambert-St Louis.
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Find 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 marzo 3, 2025.

This United deal was found by Cheapflights users on 3/3. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/266:00 amBOS - STL
2 stops9h 23mUnited Airlines
sáb. 3/2911:05 amSTL - BOS
1 stop7h 15mUnited Airlines
Deal found 3/3$322
This Delta deal was found by Cheapflights users on 3/3. 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.
mar. 3/253:55 pmBOS - STL
1 stop8h 36mDelta
dom. 4/66:10 amSTL - BOS
1 stop12h 15mDelta
Deal found 3/3$323
This Mytrip deal was found by Cheapflights users on 3/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/108:50 amBOS - STL
3 stops34h 51mMultiple Airlines
jue. 3/139:50 amSTL - BOS
3 stops32h 50mMultiple Airlines
Deal found 3/2$324
This Southwest deal was found by Cheapflights users on 3/2. 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.
mar. 4/87:05 amBOS - STL
Nonstop2h 55mSouthwest
mar. 4/152:05 pmSTL - BOS
Nonstop2h 35mSouthwest
Deal found 3/2$331
This American Airlines deal was found by Cheapflights users on 3/3. 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.
dom. 5/116:30 amBOS - STL
Nonstop3h 10mAmerican Airlines
mar. 5/136:00 amSTL - BOS
1 stop8h 10mAmerican Airlines
Deal found 3/3$332
This Mytrip deal was found by Cheapflights users on 3/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/101:56 pmBOS - STL
1 stop27h 46mSpirit Airlines
jue. 3/135:38 pmSTL - BOS
1 stop15h 21mSpirit Airlines
Deal found 3/2$359
This CheapOair deal was found by Cheapflights users on 3/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/56:00 amBOS - STL
1 stop18h 43mFrontier
jue. 3/65:24 pmSTL - BOS
1 stop13h 49mFrontier
Deal found 3/2$370

Find flights from Boston to St. Louis within your budget

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 marzo 3, 2025.

Fly from

Boston

Fly to

St. Louis

Route

Depart

Return

Price

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mié. 3/26

6:00 am-2:23 pm

2 stops9h 23m

Lambert-St Louis

sáb. 3/29

11:05 am-7:20 pm

1 stop7h 15m

$322

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mar. 3/25

3:55 pm-11:31 pm

1 stop8h 36m

Lambert-St Louis

dom. 4/6

6:10 am-7:25 pm

1 stop12h 15m

$323

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

jue. 4/3

6:30 am-8:58 am

Nonstop3h 28m

Lambert-St Louis

lun. 4/7

9:12 am-12:55 pm

Nonstop2h 43m

$330

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mar. 4/8

7:05 am-9:00 am

Nonstop2h 55m

Lambert-St Louis

mar. 4/15

2:05 pm-5:40 pm

Nonstop2h 35m

$331

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

lun. 3/17

9:17 pm-6:41 pm

2 stops22h 24m

Lambert-St Louis

mié. 3/19

12:15 pm-9:59 am

3 stops20h 44m

$335

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

vie. 5/23

6:00 am-11:37 pm

1 stop18h 37m

Lambert-St Louis

lun. 5/26

5:22 pm-1:12 am

1 stop6h 50m

$400

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

vie. 5/9

4:35 pm-6:32 pm

2 stops26h 57m

$116

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

vie. 5/2

1:00 pm-6:18 pm

1 stop6h 18m

$129

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

jue. 3/13

6:00 am-10:00 am

1 stop29h 00m

$130

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

mar. 4/1

6:13 pm-11:45 am

3 stops42h 32m

$134

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/3

Showing 1-10 of 14 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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
FlightnetworkPrice Accuracy-Trust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust 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 Boston-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-St. Louis flight deals on Cheapflights vs. FlightHub >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 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 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.

Travel insights for flights from Boston to St. Louis

Get recent, data-driven insights about flights from Boston to St. Louis including ideal travel times, pricing trends, and more.

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 February 28, 2025.

To ensure you get the cheapest price possible for a flight from Boston to St. Louis, you should look to book at least 63 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, August is the cheapest month in which you can book a flight from Boston to St. Louis (average of $311). Flying from Boston to St. Louis in March is currently the most expensive (average of $356). 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 marzo 3, 2025.

It’s typically best to fly out from Boston to St. Louis in the evening. Doing so could potentially save you 7% 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 February 23, 2025.

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

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 marzo 3, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta from Boston to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,333 reviews

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Southwest
8.1
Very good
4,333 reviews
Southwest
8.1
Very good
4,333 reviews

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Alaska Airlines
8.0
Very good
9,710 reviews
Southwest
8.1
Very good
4,333 reviews

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Delta
8.0
Very good
8,068 reviews
Southwest
8.1
Very good
4,333 reviews

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

United Airlines
7.4
Good
8,679 reviews
Southwest
8.1
Very good
4,333 reviews

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,333 reviews

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 2 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. 2h 50m 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 7 times in the past calendar month.

  • 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 $322. Other airlines that can offer you cheap pricing are Delta, from $323, and American Airlines, from $330. United Airlines is priced at 25% 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 Spirit Airlines, with whom users have recently found tickets for as low as $116. However, be on the lookout for offers from Delta and Frontier, 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%), Southwest (76%), Qatar Airways (76%).

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

    Looking at all options, your cheapest flight can be booked for $138. While the most popular route (Boston Logan Intl - Lambert-St Louis) can be booked for $146 on average our data indicates $377 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, August is the cheapest month in which you can book a flight from Boston to St. Louis (average of $311). Flying from Boston to St. Louis in March is currently the most expensive (average of $356). 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
Fenton
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Chesterfield

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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 marzo 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$238FlexibilityNo cancel feeOn-time65%
FrontierCheapest$113Average$208FlexibilityNo cancel feeOn-time62%
DeltaCheapest$196Average$370FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$259Average$467FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$304Average$441FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$318Average$444FlexibilityNo cancel feeOn-time63%
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