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 $320. Other airlines that can offer you cheap pricing are Delta, from $324, and Sun Country Air, from $325. Spirit Airlines is priced at 26% 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 $83. However, be on the lookout for offers from American Airlines and Southwest, as they are both options that can get you from Boston to St. Louis for a low price.

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

Looking at all options, your cheapest flight can be booked for $144. While the most popular route (Boston Logan Intl - Lambert-St Louis) can be booked for $172 on average our data indicates $342 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 (99%), American Airlines (97%).

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 $434 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 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. 2h 50m 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.

$83+ Flights from Boston to St. Louis

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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	$320 (Mytrip)
One-way from	$83 (Mytrip)
Popular in	April
Cheapest in	September
Average price	$436
Good round-trip deal	$382 or less
Good one-way deal	$185 or less

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. 9% potential increase in price ($43 potential increase over avg. RT price).

Search Deals

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

Search Deals

Average for round-trip flights in June 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

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 June 12, 2025.

Tue 7/89:58 amBOS - STL

3 stops25h 31mSpirit Airlines

Tue 7/155:26 pmSTL - BOS

1 stop29h 22mSpirit Airlines

Deal found 6/11

$320

Mon 7/72:26 pmBOS - STL

3 stops29h 15mMultiple Airlines

Wed 7/911:24 amSTL - BOS

2 stops23h 07mMultiple Airlines

Deal found 6/10

$321

Wed 7/306:00 amBOS - STL

1 stop6h 34mDelta

Mon 8/46:04 pmSTL - BOS

1 stop13h 56mDelta

Deal found 6/10

$324

Thu 8/1411:38 amBOS - STL

1 stop24h 52mSun Country Air

Sun 8/178:00 amSTL - BOS

1 stop25h 37mSun Country Air

Deal found 6/12

$325

Tue 7/85:25 amBOS - STL

1 stop7h 45mSouthwest

Tue 7/152:50 pmSTL - BOS

Nonstop2h 35mSouthwest

Deal found 6/10

$327

Fri 7/46:59 amBOS - STL

1 stop10h 29mAmerican Airlines

Tue 7/86:25 pmSTL - BOS

Nonstop2h 42mAmerican Airlines

Deal found 6/11

$332

Tue 7/19:01 amBOS - STL

2 stops15h 52mFrontier

Thu 7/108:44 pmSTL - BOS

1 stop13h 13mFrontier

Deal found 6/10

$337

Wed 10/158:00 amBOS - STL

1 stop8h 44mUnited Airlines

Sun 10/1912:25 pmSTL - BOS

1 stop20h 31mUnited Airlines

Deal found 6/10

$405

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 June 12, 2025.

Tue 7/89:58 amBOS - STL

3 stops25h 31mSpirit Airlines

Tue 7/155:26 pmSTL - BOS

1 stop29h 22mSpirit Airlines

Deal found 6/11

$320

Mon 7/72:26 pmBOS - STL

3 stops29h 15mMultiple Airlines

Wed 7/911:24 amSTL - BOS

2 stops23h 07mMultiple Airlines

Deal found 6/10

$321

Wed 7/308:05 amBOS - STL

1 stop5h 29mDelta

Tue 8/510:46 amSTL - BOS

1 stop10h 56mDelta

Deal found 6/10

$324

Thu 8/1411:38 amBOS - STL

1 stop24h 52mSun Country Air

Sun 8/178:00 amSTL - BOS

1 stop25h 37mSun Country Air

Deal found 6/12

$325

Tue 7/85:25 amBOS - STL

1 stop7h 45mSouthwest

Tue 7/152:50 pmSTL - BOS

Nonstop2h 35mSouthwest

Deal found 6/10

$327

Fri 7/46:59 amBOS - STL

1 stop10h 29mAmerican Airlines

Tue 7/86:25 pmSTL - BOS

Nonstop2h 42mAmerican Airlines

Deal found 6/11

$332

Tue 7/19:01 amBOS - STL

2 stops15h 52mFrontier

Thu 7/108:44 pmSTL - BOS

1 stop13h 13mFrontier

Deal found 6/10

$337

Tue 7/89:03 amBOS - STL

1 stop6h 34mUnited Airlines

Tue 7/158:00 amSTL - BOS

1 stop5h 42mUnited Airlines

Deal found 6/10

$415

Last-minute flights from Boston to St. Louis
Discover last-minute flight deals from Boston to St. Louis. Data last updated June 12, 2025 and is based on user searches.

Tue 6/1710:00 amBOS - STL

1 stop11h 53mDelta

Tue 7/19:19 amSTL - BOS

1 stop7h 15mDelta

Deal found 6/10

$476

Tue 6/175:30 amBOS - STL

1 stop5h 26mUnited Airlines

Mon 6/305:00 amSTL - BOS

2 stops9h 32mUnited Airlines

Deal found 6/10

$594

Tue 6/177:30 amBOS - STL

2 stops31h 56mAlaska Airlines

Tue 7/17:32 pmSTL - BOS

1 stop27h 27mAlaska Airlines

Deal found 6/10

$905

Thu 6/198:03 pmBOS - STL

1 stop22h 01mMultiple Airlines

Sun 6/228:44 pmSTL - BOS

1 stop13h 17mMultiple Airlines

Deal found 6/10

$327

Thu 6/193:26 pmBOS - STL

2 stops26h 38mSpirit Airlines

Sun 6/226:36 pmSTL - BOS

2 stops28h 11mSpirit Airlines

Deal found 6/10

$437

Fri 6/2010:14 amBOS - STL

1 stop28h 53mFrontier

Sun 6/228:44 pmSTL - BOS

1 stop13h 17mFrontier

Deal found 6/12

$372

Sat 6/218:00 amBOS - STL

Nonstop3h 08mAmerican Airlines

Tue 6/246:55 pmSTL - BOS

Nonstop2h 40mAmerican Airlines

Deal found 6/10

$563

Sun 6/227:25 amBOS - STL

Nonstop2h 55mSouthwest

Tue 6/247:40 pmSTL - BOS

Nonstop2h 30mSouthwest

Deal found 6/10

$636

Tue 7/19:01 amBOS - STL

2 stops15h 52mFrontier

Thu 7/108:44 pmSTL - BOS

1 stop13h 13mFrontier

Deal found 6/10

$337

Fri 7/46:59 amBOS - STL

1 stop10h 29mAmerican Airlines

Tue 7/86:25 pmSTL - BOS

Nonstop2h 42mAmerican Airlines

Deal found 6/11

$332

Mon 7/72:26 pmBOS - STL

3 stops29h 15mMultiple Airlines

Wed 7/911:24 amSTL - BOS

2 stops23h 07mMultiple Airlines

Deal found 6/10

$321

Tue 7/89:58 amBOS - STL

3 stops25h 31mSpirit Airlines

Tue 7/155:26 pmSTL - BOS

1 stop29h 22mSpirit Airlines

Deal found 6/11

$320

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 June 12, 2025.

Thu 9/111:55 pmBOS - STL

1 stop18h 54mSpirit Airlines

Deal found 6/12

$83

Tue 8/265:29 amBOS - STL

1 stop8h 25mAmerican Airlines

Deal found 6/12

$111

Mon 7/149:32 amBOS - STL

2 stops10h 09mMultiple Airlines

Deal found 6/12

$138

Sat 7/125:50 amBOS - STL

Nonstop2h 55mSouthwest

Deal found 6/11

$158

Wed 10/88:00 amBOS - STL

1 stop8h 44mUnited Airlines

Deal found 6/10

$176

Sun 8/175:15 amBOS - STL

1 stop5h 17mDelta

Deal found 6/12

$212

Fri 6/209:40 amBOS - STL

1 stop15h 13mFrontier

Deal found 6/11

$236

Tue 9/26:00 amBOS - STL

2 stops33h 39mAlaska Airlines

Deal found 6/10

$248

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

Tue 7/8

9:58 am-10:29 am

3 stops25h 31m

Lambert-St Louis

Tue 7/15

5:26 pm-11:48 pm

1 stop29h 22m

$320

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 7/7

2:26 pm-6:41 pm

3 stops29h 15m

Lambert-St Louis

Wed 7/9

11:24 am-11:31 am

2 stops23h 07m

$321

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 7/30

8:05 am-12:34 pm

1 stop5h 29m

Lambert-St Louis

Tue 8/5

10:46 am-10:42 pm

1 stop10h 56m

$324

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 8/14

11:38 am-11:30 am

1 stop24h 52m

Lambert-St Louis

Sun 8/17

8:00 am-10:37 am

1 stop25h 37m

$325

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 7/8

5:25 am-12:10 pm

1 stop7h 45m

Lambert-St Louis

Tue 7/15

2:50 pm-6:25 pm

Nonstop2h 35m

$327

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 7/4

6:59 am-4:28 pm

1 stop10h 29m

Lambert-St Louis

Tue 7/8

6:25 pm-10:07 pm

Nonstop2h 42m

$332

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 7/1

9:01 am-11:53 pm

2 stops15h 52m

Lambert-St Louis

Thu 7/10

8:44 pm-10:57 am

1 stop13h 13m

$337

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 10/13

4:20 pm-11:44 pm

1 stop8h 24m

Lambert-St Louis

Thu 10/16

12:25 pm-12:50 am

1 stop11h 25m

$398

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 9/11

1:55 pm-7:49 am

1 stop18h 54m

$83

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 8/26

5:29 am-12:54 pm

1 stop8h 25m

$111

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 16 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.

Rainfall in St. Louis 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

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

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest 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.

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

10,000 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,287 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,950 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,790 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 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. 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 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 $320. Other airlines that can offer you cheap pricing are Delta, from $324, and Sun Country Air, from $325. Spirit Airlines is priced at 26% 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 $83. However, be on the lookout for offers from American Airlines and Southwest, 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 (99%), American Airlines (97%).
What are the cheapest flights from Boston to St. Louis?
Looking at all options, your cheapest flight can be booked for $144. While the most popular route (Boston Logan Intl - Lambert-St Louis) can be booked for $172 on average our data indicates $342 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

O'Fallon

Maryland Heights

Fairview Heights

Collinsville

Eureka

St. Peters

Glencoe

Festus

Alton

Farmington

Browse thousands of different options on Cheapflights for your next trip

Top 6 airlines flying from Boston to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$107	Average$167	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$113	Average$212	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$196	Average$299	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$257	Average$436	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$290	Average$445	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$333	Average$458	FlexibilityNo cancel fee	On-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$83+ 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 9/11. 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 June 12, 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 June 12, 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 9, 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 June 12, 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 8, 2025.

Rainfall in St. Louis by month

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

Temperature in St. Louis by month

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

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest 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.

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?

Traveling to a place near Boston?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Boston to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 6 airlines flying from Boston to St. Louis

100% Free

Book with Flexibility

Travel Smart

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 June 12, 2025.