What airlines fly to St. Louis?

American Airlines, Southwest and Delta are the top three most popular airlines that fly to St. Louis from Boston according to our data. American Airlines is the first choice among our users, with 53% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 6 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

How many flights depart from Boston to St. Louis on average per day?

As of November 2025, there are 4 flights per day flying from Boston to St. Louis. The most common time of day flights depart is 6:00AM, with 44% of flights taking off at noon.

Which airline has the best punctuality record on Boston to St. Louis flights?

According to our data, British Airways have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

What is the cheapest airline that flies from Boston Logan Intl to Lambert-St Louis?

Frontier and American Airlines are the most popular carriers operating from Boston Logan Intl to Lambert-St Louis

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

How often are flights from Boston to St. Louis delayed?

Historically, on average around 14% of flights between Boston and St. Louis have experienced a delay on any given week. The average delay length over the past 12 months has been 135 minutes.

How many flights depart from Boston to St. Louis on average per week?

30 flights are operational weekly from Boston to St. Louis as of November 2025. The most popular departure day for this route is Mon, with 20% of flights per week taking off on this day.

What is the most punctual flight time for Boston to St. Louis flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

When did momondo last update prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?

Prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport were last updated today.

How many operators does momondo search for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?

As of November 2025, there are 6 operators available to choose from for flights from Boston Logan Intl Airport to Lambert-St Louis Airport.

How old do you have to be to fly from Boston Logan Intl Airport to Lambert-St Louis Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Lambert-St Louis Airport.

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$61 Cheap Flights from Boston to St. Louis in 2025/26

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11:55 am - 2:23 pmBOS-STL

3h 28mnonstop

11:05 am - 8:45 pmSTL-BOS

8h 40m1 stop

$322American Airlines

Find Deal

Fri, Jan 16 - Sun, Jan 18

6:40 am - 6:13 pmBOS-STL

12h 33m1 stop

2:54 pm - 6:31 pmSTL-BOS

2h 37mnonstop

$324American Airlines

Find Deal

Sat, Jan 10 - Wed, Jan 14

5:45 pm - 2:29 pmBOS-STL

21h 44m2 stops

3:14 pm - 12:44 amSTL-BOS

8h 30m1 stop

$325Multiple Airlines

Find Deal

Mon, Nov 24 - Thu, Nov 27

10:59 am - 11:57 pmBOS-STL

13h 58m1 stop

8:37 pm - 10:21 amSTL-BOS

12h 44m1 stop

$327Frontier

Find Deal

Mon, Dec 1 - Fri, Dec 19

10:43 am - 9:40 amBOS-STL

23h 57m1 stop

10:57 am - 9:42 amSTL-BOS

21h 45m1 stop

$331Frontier

Find Deal

Mon, Dec 29 - Sun, Jan 4

6:25 am - 8:45 amBOS-STL

3h 20mnonstop

5:55 pm - 9:25 pmSTL-BOS

2h 30mnonstop

$351Southwest

Find Deal

Tue, Jan 6 - Tue, Jan 13

6:00 am - 2:25 pmBOS-STL

9h 25m1 stop

6:42 pm - 2:20 pmSTL-BOS

18h 38m1 stop

$358United Airlines

Find Deal

Wed, Dec 3 - Wed, Dec 10

6:25 am - 8:45 amBOS-STL

3h 20mnonstop

5:55 pm - 9:25 pmSTL-BOS

2h 30mnonstop

$366Southwest

Find Deal

Thu, Jan 8 - Tue, Jan 13

12:50 pm - 3:40 pmBOS-STL

27h 50m1 stop

6:42 pm - 12:43 pmSTL-BOS

17h 01m1 stop

$380United Airlines

Find Deal

Mon, Dec 8 - Wed, Dec 10

5:45 am - 1:52 pmBOS-STL

9h 07m1 stop

2:47 pm - 7:06 pmSTL-BOS

27h 19m3 stops

$384Spirit Airlines

Find Deal

Thu, Dec 4 - Sun, Dec 7

Southwest flights from Boston to St. Louis

Our best Southwest deals on Boston to St. Louis flight tickets

Southwest

Jan 6

BOS6:25 amBoston Logan Intl

3h 20m

STL8:45 amLambert-St Louis

Jan 13

STL5:55 pmLambert-St Louis

2h 30m

BOS9:25 pmBoston Logan Intl

$351

Find similar

Southwest

Jan 8

BOS6:25 amBoston Logan Intl

3h 20m

STL8:45 amLambert-St Louis

Jan 13

STL5:55 pmLambert-St Louis

2h 30m

BOS9:25 pmBoston Logan Intl

$366

Find similar

Southwest

Nov 20

BOS7:20 amBoston Logan Intl

3h 10m

STL9:30 amLambert-St Louis

Nov 27

STL2:00 pmLambert-St Louis

2h 30m

BOS5:30 pmBoston Logan Intl

$620

Find similar

American Airlines flights from Boston to St. Louis

Our best American Airlines deals on Boston to St. Louis flight tickets

American Airlines

Jan 16

BOS11:55 amBoston Logan Intl

3h 28m

STL2:23 pmLambert-St Louis

Jan 18

STL11:05 amLambert-St Louis

8h 40m

1 stop

BOS8:45 pmBoston Logan Intl

$322

Find similar

American Airlines

Jan 10

BOS6:40 amBoston Logan Intl

12h 33m

1 stop

STL6:13 pmLambert-St Louis

Jan 14

STL2:54 pmLambert-St Louis

2h 37m

BOS6:31 pmBoston Logan Intl

$324

Find similar

American Airlines

Dec 31

BOS6:36 amBoston Logan Intl

10h 47m

1 stop

STL4:23 pmLambert-St Louis

Jan 3

STL5:22 amLambert-St Louis

7h 35m

1 stop

BOS1:57 pmBoston Logan Intl

$332

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Fri 1/16

11:55 am-2:23 pm

Nonstop3h 28m

Lambert-St Louis

Sun 1/18

11:05 am-8:45 pm

1 stop8h 40m

$322

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Sat 1/10

6:40 am-6:13 pm

1 stop12h 33m

Lambert-St Louis

Wed 1/14

2:54 pm-6:31 pm

Nonstop2h 37m

$324

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 11/24

5:45 pm-2:29 pm

2 stops21h 44m

Lambert-St Louis

Thu 11/27

3:14 pm-12:44 am

1 stop8h 30m

$325

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 12/1

10:59 am-11:57 pm

1 stop13h 58m

Lambert-St Louis

Fri 12/19

8:37 pm-10:21 am

1 stop12h 44m

$327

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 12/29

10:43 am-9:40 am

1 stop23h 57m

Lambert-St Louis

Sun 1/4

10:57 am-9:42 am

1 stop21h 45m

$331

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Tue 1/6

6:25 am-8:45 am

Nonstop3h 20m

Lambert-St Louis

Tue 1/13

5:55 pm-9:25 pm

Nonstop2h 30m

$351

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Wed 12/3

6:00 am-2:25 pm

1 stop9h 25m

Lambert-St Louis

Wed 12/10

6:42 pm-2:20 pm

1 stop18h 38m

$358

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 1/8

6:25 am-8:45 am

Nonstop3h 20m

Lambert-St Louis

Tue 1/13

5:55 pm-9:25 pm

Nonstop2h 30m

$366

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Mon 12/8

12:50 pm-3:40 pm

1 stop27h 50m

Lambert-St Louis

Wed 12/10

6:42 pm-12:43 pm

1 stop17h 01m

$380

BostonSt. Louis

BOS - STL

BOSSTL

Boston Logan Intl

Thu 12/4

5:45 am-1:52 pm

1 stop9h 07m

Lambert-St Louis

Sun 12/7

2:47 pm-7:06 pm

3 stops27h 19m

$384

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Boston to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

Other information

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

In general, August is the cheapest month to fly from Boston to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $382. The month of January is another great option to travel to St. Louis, with average flight prices from Boston averaging around $389.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $422. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $501. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Boston in the evening is the least expensive time of day to depart. momondo users have found prices as low as $432 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $457 per ticket.

What is the cheapest Boston Logan Intl to Lambert-St Louis flight route?

Fly from Boston Logan Intl to Lambert-St Louis for the best Boston Logan Intl - Lambert-St Louis flight prices

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

You are more likely to see cheaper flights to St. Louis from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $442 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Boston for as low as $391 on momondo.

What cabin class options are available on Boston Logan Intl to Lambert-St Louis flights?

There are 3 cabin classes available to choose from on Boston Logan Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Boston to St. Louis flights?

You could potentially save up to 15% on your flight if you consider stops on a Boston to St. Louis flight.

How have Boston to St. Louis flight prices changed over time?

As of November 2025, prices for Boston to St. Louis flights are approximately 3% cheaper when compared to flights at the same time last year.

When to book flights from Boston to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to St. Louis according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Boston to St. Louis (BOS to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to St. Louis

Best Price Found	$206
Fastest flight time	3h 05m
Direct flights	Every day
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from Boston in the past 72 hours is $206. The best round-trip flight deal from Boston to St. Louis found on momondo in the last 72 hours is $348.

The fastest flight from Boston to St. Louis takes 3h 05m

Direct flights go from Boston to St. Louis every day.

There is 1 airport near St. Louis: Lambert-St Louis (STL)

Search flight deals

How far is Boston Logan Intl to Lambert-St Louis by plane?
Lambert-St Louis is 1035.0 mi away from Boston Logan Intl. Flights usually cover this in 3h 20m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?
Prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport were last updated today.
How many operators does momondo search for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?
As of November 2025, there are 6 operators available to choose from for flights from Boston Logan Intl Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Boston Logan Intl Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Boston to St. Louis?
momondo data reveals that the most frequently booked plane model on the route from Boston to St. Louis is Boeing 737 MAX 8, representing 22.99% of all bookings. The subsequent popular models are Embraer 175 at 22.77%, Boeing 737-800 Passenger/BBJ2 (winglets) at 14.79%, and Boeing 737-700 Passenger/BBJ1 (winglets) at 8.86%.
What is the most popular airline from Boston to St. Louis?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Boston to St. Louis is American Airlines (50% of total bookings). The next most popular airlines are Southwest (39%), Delta (5%), and Frontier (3%).

Best airlines flying from Boston to St. Louis

Compare and see reviews for airlines that fly from Boston to St. Louis with momondo

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $83	Free Cancellation	Rating 6.3 8,131 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $110	Free Cancellation	Rating 5.8 3,111 reviews	Search Frontier flights
Delta	PriceFrom $216	Free Cancellation	Rating 7.9 8,004 reviews	Search Delta flights
United Airlines	PriceFrom $292	Free Cancellation	Rating 7.4 9,011 reviews	Search United Airlines flights
American Airlines	PriceFrom $297	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights
Southwest	PriceFrom $322	Free Cancellation	Rating 8.0 4,238 reviews	Search Southwest flights

Southwest Flights From Boston to St. Louis
Southwest operates around 13 flights from Boston to St. Louis every week. The average price of these flights found in the last 72 hours has been $467, but momondo users have found Southwest deals from Boston to St. Louis from as low as $322 round-trip. Southwest has been scored 8.0/10 in 4,238 reviews.
American Airlines Flights From Boston to St. Louis
The best American Airlines deal for Boston to St. Louis flight tickets found on momondo in the last 72 hours was $297, round-trip. It should be noted that an average American Airlines flight deal for this route in this time was higher, at $455 round-trip. American Airlines operates 13 flights out of Boston into St. Louis in an average week, so prices vary by time and availability. 11,047 American Airlines reviews by users on momondo have scored the airline at 7.2/10.

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Hermann

Fairview Heights

Florissant

Maryland Heights

O'Fallon

Wentzville

Fenton

Collinsville

St. Peters

Alton

Farmington

Festus

Glencoe

Edwardsville

Clayton

Eureka

Litchfield

Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Boston to St. Louis?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Boston to St. Louis for you.

Can I find flights from Boston to St. Louis with flexible booking policies on momondo?

Yes. All flights to St. Louis from Boston on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Boston to St. Louis?

momondo helps you find the best flight between Boston and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Boston to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from Boston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from Boston to St. Louis from $61

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to St. Louis departing on 1/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Filter for what you want

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Southwest flights from Boston to St. Louis

Our best Southwest deals on Boston to St. Louis flight tickets

American Airlines flights from Boston to St. Louis

Our best American Airlines deals on Boston to St. Louis flight tickets

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See travel insights to St. Louis from

How to get the cheapest flight ticket from Boston to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

What is the cheapest day to depart on your flight to St. Louis?

What is the cheapest time of day to depart on your flight to St. Louis?

What is the cheapest Boston Logan Intl to Lambert-St Louis flight route?

Fly from Boston Logan Intl to Lambert-St Louis for the best Boston Logan Intl - Lambert-St Louis flight prices

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

What cabin class options are available on Boston Logan Intl to Lambert-St Louis flights?

There are 3 cabin classes available to choose from on Boston Logan Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Boston to St. Louis flights?

You could potentially save up to 15% on your flight if you consider stops on a Boston to St. Louis flight.

How have Boston to St. Louis flight prices changed over time?

As of November 2025, prices for Boston to St. Louis flights are approximately 3% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Boston Logan Intl to Lambert-St Louis?

Frontier and American Airlines are the most popular carriers operating from Boston Logan Intl to Lambert-St Louis

What airlines fly to St. Louis?

How often are flights from Boston to St. Louis delayed?

Historically, on average around 14% of flights between Boston and St. Louis have experienced a delay on any given week. The average delay length over the past 12 months has been 135 minutes.

What is the most punctual flight time for Boston to St. Louis flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Boston to St. Louis flights?

According to our data, British Airways have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

How many flights depart from Boston to St. Louis on average per day?

As of November 2025, there are 4 flights per day flying from Boston to St. Louis. The most common time of day flights depart is 6:00AM, with 44% of flights taking off at noon.

How many flights depart from Boston to St. Louis on average per week?

30 flights are operational weekly from Boston to St. Louis as of November 2025. The most popular departure day for this route is Mon, with 20% of flights per week taking off on this day.

When to book flights from Boston to St. Louis

Cheap Boston to St. Louis (BOS to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to St. Louis

Best Price Found

Fastest flight time

Direct flights

Airports in St. Louis

How far is Boston Logan Intl to Lambert-St Louis by plane?

When did momondo last update prices for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?

How many operators does momondo search for flights from Boston Logan Intl Airport to Lambert-St Louis Airport?

How old do you have to be to fly from Boston Logan Intl Airport to Lambert-St Louis Airport?

What documentation or ID do you need to fly to Lambert-St Louis Airport?

What is the most popular plane model from Boston to St. Louis?

What is the most popular airline from Boston to St. Louis?

Best airlines flying from Boston to St. Louis

Compare and see reviews for airlines that fly from Boston to St. Louis with momondo

Southwest Flights From Boston to St. Louis

American Airlines Flights From Boston to St. Louis

Traveling to a place near St. Louis?

Why use momondo?

Why should I use momondo to find a flight deal from Boston to St. Louis?

Can I find flights from Boston to St. Louis with flexible booking policies on momondo?

How can momondo help me find flights from Boston to St. Louis?

I’m not ready to book a flight from Boston to St. Louis right now. Can momondo alert me if prices change?

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States