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$61+ 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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — STL
Feb 3 — Feb 101
Mon 2/3
Mon 2/10
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 January 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$220
(CheapOair)

One-way from

$61
(Frontier)

Popular in

March

Cheapest in

September

Average price

$421

Good round-trip deal

$421 or less

Good one-way deal

$211 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. 4% potential increase in price ($17 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 January 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 January 29, 2025.

This CheapOair deal was found by Cheapflights users on 1/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/86:00 amBOS - STL
1 stop18h 46mFrontier
Sun 4/134:57 pmSTL - BOS
1 stop6h 50mFrontier
Deal found 1/28$220
This Justfly.com deal was found by Cheapflights users on 1/29. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2812:45 pmBOS - STL
1 stop11h 58mMultiple Airlines
Sun 3/165:38 pmSTL - BOS
1 stop15h 21mMultiple Airlines
Deal found 1/29$225
This FlightHub deal was found by Cheapflights users on 1/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/275:40 amBOS - STL
1 stop10h 02mSpirit Airlines
Sun 3/165:38 pmSTL - BOS
1 stop15h 21mSpirit Airlines
Deal found 1/29$232
This Delta deal was found by Cheapflights users on 1/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/286:55 amBOS - STL
1 stop5h 51mDelta
Thu 3/136:10 amSTL - BOS
1 stop7h 33mDelta
Deal found 1/28$247
This American Airlines deal was found by Cheapflights users on 1/28. 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.
Tue 2/46:30 amBOS - STL
Nonstop3h 24mAmerican Airlines
Tue 2/412:00 pmSTL - BOS
1 stop9h 12mAmerican Airlines
Deal found 1/28$257
This United deal was found by Cheapflights users on 1/28. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/67:10 amBOS - STL
1 stop5h 12mUnited Airlines
Mon 3/107:30 amSTL - BOS
1 stop6h 45mUnited Airlines
Deal found 1/28$297
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/187:20 amBOS - STL
Nonstop3h 15mSouthwest
Thu 2/208:30 amSTL - BOS
Nonstop2h 35mSouthwest
Deal found 1/28$383

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 January 29, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 4/8

6:00 am-11:46 pm

1 stop18h 46m

Lambert-St Louis

Sun 4/13

4:57 pm-12:47 am

1 stop6h 50m

$220

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 2/28

12:45 pm-11:43 pm

1 stop11h 58m

Lambert-St Louis

Sun 3/16

5:38 pm-9:59 am

1 stop15h 21m

$225

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 2/27

5:40 am-2:42 pm

1 stop10h 02m

Lambert-St Louis

Sun 3/16

5:38 pm-9:59 am

1 stop15h 21m

$232

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 2/28

7:00 am-12:28 pm

1 stop6h 28m

Lambert-St Louis

Tue 3/18

6:50 am-11:54 am

1 stop4h 04m

$247

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 3/6

7:10 am-11:22 am

1 stop5h 12m

Lambert-St Louis

Mon 3/10

7:30 am-3:15 pm

1 stop6h 45m

$297

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 3/6

6:30 am-8:47 am

Nonstop3h 17m

Lambert-St Louis

Tue 3/11

6:10 am-3:09 pm

1 stop7h 59m

$304

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 2/18

7:20 am-9:35 am

Nonstop3h 15m

Lambert-St Louis

Thu 2/20

8:30 am-12:05 pm

Nonstop2h 35m

$383

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 3/3

12:45 pm-11:43 pm

1 stop11h 58m

$61

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 3/10

5:29 pm-4:42 pm

1 stop24h 13m

$80

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 4/9

9:30 am-2:42 pm

1 stop6h 12m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 14 results
1
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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 January.
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 January 24, 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 January 29, 2025.

It’s typically best to fly out from Boston to St. Louis in the evening. Doing so could potentially save you 8% 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 January 26, 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 afternoons 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 January 29, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta and United Airlines 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
4,592 reviews

Comfort

8.1

Entertainment

7.7

Food

7.1

Boarding

8.2

Overall

8.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,592 reviews
Southwest
8.1
Very good
4,592 reviews

Comfort

8.1

Entertainment

7.7

Food

7.1

Boarding

8.2

Overall

8.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,456 reviews
Southwest
8.1
Very good
4,592 reviews

Comfort

8.1

Entertainment

7.7

Food

7.1

Boarding

8.2

Overall

8.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,916 reviews
Southwest
8.1
Very good
4,592 reviews

Comfort

8.1

Entertainment

7.7

Food

7.1

Boarding

8.2

Overall

8.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,592 reviews

Comfort

8.1

Entertainment

7.7

Food

7.1

Boarding

8.2

Overall

8.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Spirit Airlines
6.3
Okay
8,087 reviews
Southwest
8.1
Very good
4,592 reviews

Comfort

8.1

Entertainment

7.7

Food

7.1

Boarding

8.2

Overall

8.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 55m 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 5 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 $220. Other airlines that can offer you cheap pricing are Spirit Airlines, from $232, and Delta, from $247. Frontier is priced at 48% 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 $61. 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: Qatar Airways (90%), Republic Airways (88%), Southwest (88%).

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

    Looking at all options, your cheapest flight can be booked for $162. While the most popular route (Boston Logan Intl - Lambert-St Louis) can be booked for $142 on average our data indicates $388 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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Maryland Heights
Collinsville
Wentzville
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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 January 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$238FlexibilityNo cancel feeOn-time65%
FrontierCheapest$113Average$202FlexibilityNo cancel feeOn-time62%
DeltaCheapest$196Average$374FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$257Average$453FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$299Average$440FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$310Average$443FlexibilityNo cancel feeOn-time63%
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