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

Flights from Boston Logan Intl to Lambert-St Louis have been viewed 30 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 $312. Other airlines that can offer you cheap pricing are Spirit Airlines, from $320, and Southwest, from $322. American Airlines is priced at 28% 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 $69. However, be on the lookout for offers from Frontier and American Airlines, as they are both options that can get you from Boston to St. Louis for a low price.

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.

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).

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

Looking at all options, your cheapest flight can be booked for $129. While the most popular route (Boston Logan Intl - Lambert-St Louis) can be booked for $139 on average our data indicates $482 when flying from Boston to St. Louis.

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 (86%).

What are the most popular airlines that fly from Boston to St. Louis?

Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from Boston to St. Louis.

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

Saturday flights are found to be more expensive to fly from Boston to St. Louis. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to St. Louis.

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

To save up to 74% on this flight, we recommend booking at least 59 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Boston to St. Louis from $521 1-2 weeks out and tickets from $681 for flights departing within the next 72 hours.

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

Due to multiple factors, expect to potentially pay more when booking in April. For low rates, September can be a great choice for travel to St. Louis. Flights to St. Louis from Boston in September are about $435 on average during September, but can be found for as low as $196.

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.

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.

$69+ Flights from Boston to St. Louis

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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”

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Cheapflights Tip: 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 Wednesday or Thursday and return on a Thursday

Cheap flight deals from Boston to St. Louis

Round-trip from	$312 (American Airlines)
One-way from	$69 (FlightHub)
Popular in	April
Cheapest in	September
Average price	$438
Good round-trip deal	$379 or less
Good one-way deal	$193 or less

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. 8% potential increase in price ($42 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).

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Average for round-trip flights in July 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 July 3, 2025.

Fri 8/297:00 amBOS - STL

Nonstop3h 15mAmerican Airlines

Tue 9/29:45 amSTL - BOS

Nonstop2h 41mAmerican Airlines

Deal found 7/1

$312

Sat 7/266:10 amBOS - STL

1 stop9h 29mSpirit Airlines

Sun 7/2710:47 amSTL - BOS

3 stops36h 01mSpirit Airlines

Deal found 7/1

$320

Fri 7/256:00 amBOS - STL

3 stops13h 41mMultiple Airlines

Sun 7/2710:47 amSTL - BOS

2 stops21h 11mMultiple Airlines

Deal found 7/2

$321

Thu 8/147:10 amBOS - STL

Nonstop2h 55mSouthwest

Sun 8/175:30 amSTL - BOS

1 stop5h 50mSouthwest

Deal found 7/2

$322

Sat 9/137:55 amBOS - STL

1 stop5h 26mDelta

Sat 9/135:27 pmSTL - BOS

1 stop4h 52mDelta

Deal found 7/1

$329

Mon 11/246:00 amBOS - STL

1 stop17h 47mUnited Airlines

Thu 11/276:45 amSTL - BOS

1 stop11h 35mUnited Airlines

Deal found 7/1

$353

Mon 7/1410:18 amBOS - STL

2 stops14h 29mFrontier

Thu 7/178:44 pmSTL - BOS

1 stop13h 13mFrontier

Deal found 7/1

$360

Best flights from Boston to St. Louis
Discover carefully curated flight deals from Boston to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Fri 8/297:00 amBOS - STL

Nonstop3h 15mAmerican Airlines

Tue 9/29:45 amSTL - BOS

Nonstop2h 41mAmerican Airlines

Deal found 7/1

$312

Sat 7/266:10 amBOS - STL

1 stop9h 29mSpirit Airlines

Sun 7/2710:47 amSTL - BOS

3 stops36h 01mSpirit Airlines

Deal found 7/1

$320

Fri 7/256:00 amBOS - STL

3 stops13h 41mMultiple Airlines

Sun 7/2710:47 amSTL - BOS

2 stops21h 11mMultiple Airlines

Deal found 7/2

$321

Thu 8/147:10 amBOS - STL

Nonstop2h 55mSouthwest

Sun 8/175:30 amSTL - BOS

1 stop5h 50mSouthwest

Deal found 7/2

$322

Sat 9/137:55 amBOS - STL

1 stop5h 26mDelta

Sat 9/135:27 pmSTL - BOS

1 stop4h 52mDelta

Deal found 7/1

$329

Mon 11/246:00 amBOS - STL

1 stop10h 29mUnited Airlines

Thu 11/2711:45 amSTL - BOS

1 stop12h 00mUnited Airlines

Deal found 7/1

$353

Mon 7/1410:18 amBOS - STL

2 stops14h 29mFrontier

Thu 7/178:44 pmSTL - BOS

1 stop13h 13mFrontier

Deal found 7/1

$360

Last-minute flights from Boston to St. Louis
Discover last-minute flight deals from Boston to St. Louis. Data last updated July 3, 2025 and is based on user searches.

Mon 7/79:40 amBOS - STL

1 stop15h 07mFrontier

Fri 7/115:40 pmSTL - BOS

1 stop13h 55mFrontier

Deal found 7/2

$328

Tue 7/87:15 amBOS - STL

Nonstop3h 14mAmerican Airlines

Tue 7/81:17 pmSTL - BOS

1 stop8h 18mAmerican Airlines

Deal found 7/1

$382

Thu 7/108:47 amBOS - STL

2 stops11h 36mFrontier

Sat 7/122:52 pmSTL - BOS

2 stops16h 07mFrontier

Deal found 7/1

$355

Fri 7/119:40 amBOS - STL

1 stop15h 07mMultiple Airlines

Tue 7/155:26 pmSTL - BOS

1 stop25h 08mMultiple Airlines

Deal found 7/2

$324

Sat 7/126:10 amBOS - STL

1 stop9h 29mSpirit Airlines

Tue 7/225:26 pmSTL - BOS

1 stop25h 08mSpirit Airlines

Deal found 7/2

$325

Fri 7/256:00 amBOS - STL

3 stops13h 41mMultiple Airlines

Sun 7/2710:47 amSTL - BOS

2 stops21h 11mMultiple Airlines

Deal found 7/2

$321

Sat 7/266:10 amBOS - STL

1 stop9h 29mSpirit Airlines

Sun 7/2710:47 amSTL - BOS

3 stops36h 01mSpirit Airlines

Deal found 7/1

$320

Thu 8/147:10 amBOS - STL

Nonstop2h 55mSouthwest

Sun 8/175:30 amSTL - BOS

1 stop5h 50mSouthwest

Deal found 7/2

$322

Fri 8/297:00 amBOS - STL

Nonstop3h 15mAmerican Airlines

Tue 9/29:45 amSTL - BOS

Nonstop2h 41mAmerican Airlines

Deal found 7/1

$312

Fri 8/298:27 pmBOS - STL

1 stop20h 17mUnited Airlines

Tue 9/29:17 amSTL - BOS

2 stops7h 17mUnited Airlines

Deal found 7/3

$357

One-way flights from Boston to St. Louis
Search for one-way flight options from Boston to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 3, 2025.

Thu 9/186:10 amBOS - STL

1 stop8h 25mSpirit Airlines

Deal found 7/2

$69

Fri 8/2910:30 amBOS - STL

1 stop28h 03mFrontier

Deal found 7/2

$112

Sat 8/305:28 amBOS - STL

1 stop8h 44mAmerican Airlines

Deal found 7/2

$114

Mon 7/289:32 amBOS - STL

2 stops10h 09mMultiple Airlines

Deal found 7/2

$126

Tue 9/97:05 amBOS - STL

2 stops11h 40mSouthwest

Deal found 7/2

$144

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 8/29

7:00 am-9:15 am

Nonstop3h 15m

Lambert-St Louis

Tue 9/2

9:45 am-1:26 pm

Nonstop2h 41m

$312

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 7/26

6:10 am-2:39 pm

1 stop9h 29m

Lambert-St Louis

Sun 7/27

10:47 am-11:48 pm

3 stops36h 01m

$320

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 7/25

6:00 am-6:41 pm

3 stops13h 41m

Lambert-St Louis

Sun 7/27

10:47 am-8:58 am

2 stops21h 11m

$321

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 8/14

7:10 am-9:05 am

Nonstop2h 55m

Lambert-St Louis

Sun 8/17

5:30 am-12:20 pm

1 stop5h 50m

$322

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 9/13

7:55 am-12:21 pm

1 stop5h 26m

Lambert-St Louis

Sat 9/13

5:27 pm-11:19 pm

1 stop4h 52m

$329

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 11/24

6:00 am-10:47 pm

1 stop17h 47m

Lambert-St Louis

Thu 11/27

6:45 am-7:20 pm

1 stop11h 35m

$353

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 7/14

10:18 am-11:47 pm

2 stops14h 29m

Lambert-St Louis

Thu 7/17

8:44 pm-10:57 am

1 stop13h 13m

$360

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 9/18

6:10 am-1:35 pm

1 stop8h 25m

$69

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 8/29

10:30 am-1:33 pm

1 stop28h 03m

$112

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 9/27

12:33 pm-8:32 pm

1 stop8h 59m

$114

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 12 results

The best insider tips for Boston to St. Louis flights

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.

STL

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

Our travel experts

Paul Rubio

Expert on BOS

Taryn White

Expert on STL

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?

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?

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?

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 evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing St. Louis

Read through reviews of airlines operating flights from Boston to St. Louis, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,266 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,982 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

United Airlines

7.4

Good

8,861 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Spirit Airlines

6.3

Okay

8,086 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

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 30 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 $312. Other airlines that can offer you cheap pricing are Spirit Airlines, from $320, and Southwest, from $322. American Airlines is priced at 28% 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 $69. However, be on the lookout for offers from Frontier and American Airlines, 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 (86%).
What are the cheapest flights from Boston to St. Louis?
Looking at all options, your cheapest flight can be booked for $129. While the most popular route (Boston Logan Intl - Lambert-St Louis) can be booked for $139 on average our data indicates $482 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

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Top 6 airlines flying from Boston to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$107	Average$186	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$113	Average$213	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$196	Average$279	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$257	Average$436	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$289	Average$449	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$333	Average$458	FlexibilityNo cancel fee	On-time63%

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$69+ 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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Boston to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: 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 Wednesday or Thursday and return on a Thursday

Cheap flight deals from Boston to St. Louis

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Boston to St. Louis

Cheapest flights from Boston to St. LouisExplore 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 July 3, 2025.

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 July 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to St. Louis that are best for you.

The best insider tips for Boston to St. Louis flights

Cheapflights partnered with top experts to bring you the best recommendations for your Boston to St. Louis trip

Airports

BOS

STL

Our travel experts

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.

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 June 27, 2025.

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

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 July 3, 2025.

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 June 29, 2025.

Reviews of airlines servicing St. Louis

Read through reviews of airlines operating flights from Boston to St. Louis, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

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

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

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

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

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

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

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

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Top 6 airlines flying from Boston to St. Louis

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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 July 3, 2025.