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$77+ Cheap flights from St. Louis to Boston (STL - BOS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOS
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Boston Logan Intl are usually found in August or September, booked 84 days in advance, depart on a Thursday or Friday and return on a Tuesday

Cheap flight deals from St. Louis to Boston

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Boston (BOS). 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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$258
(Mytrip)

One-way from

$77
(FlightHub)

Popular in

July

Cheapest in

August

Average price

$441

Good round-trip deal

$443 or less

Good one-way deal

$231 or less
Provider with most accurate pricing for Lambert-St Louis-Boston Logan Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Boston Logan Intl flights.
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From Lambert-St Louis to Boston Logan Intl
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One-way flight from Lambert-St Louis to Boston Logan Intl
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($2 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Boston Logan Intl.
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Price to beat on a one-way flight from Lambert-St Louis to Boston Logan Intl.
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Find flight deals from St. Louis to Boston

Cheapest flights from St. Louis to Boston
Explore the most affordable flight options available from St. Louis to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2025.

This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/34:57 pmSTL - BOS
1 stop6h 50mFrontier
Sun 4/66:00 amBOS - STL
1 stop18h 46mFrontier
Deal found 3/25$258
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/229:52 amSTL - BOS
1 stop7h 45mAmerican Airlines
Tue 4/2911:41 amBOS - STL
Nonstop3h 08mAmerican Airlines
Deal found 3/25$263
This Mytrip deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/16:47 pmSTL - BOS
2 stops20h 38mSpirit Airlines
Tue 4/811:14 amBOS - STL
1 stop7h 38mSpirit Airlines
Deal found 3/25$264
This Delta deal was found by Cheapflights users on 3/24. 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.
Sat 5/37:10 amSTL - BOS
1 stop5h 37mDelta
Mon 5/56:50 pmBOS - STL
1 stop5h 46mDelta
Deal found 3/24$268
This Mytrip deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/189:50 amSTL - BOS
2 stops7h 53mMultiple Airlines
Sun 4/207:48 pmBOS - STL
2 stops23h 53mMultiple Airlines
Deal found 3/25$270
This United Airlines deal was found by Cheapflights users on 3/25. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/239:39 amSTL - BOS
2 stops6h 49mUnited Airlines
Tue 4/295:30 amBOS - STL
1 stop5h 28mUnited Airlines
Deal found 3/25$297
This Southwest deal was found by Cheapflights users on 3/25. 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.
Mon 5/129:10 pmSTL - BOS
1 stop10h 00mSouthwest
Thu 5/157:35 amBOS - STL
Nonstop2h 55mSouthwest
Deal found 3/25$359

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Boston 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 March 26, 2025.
Use the filters below to find and compare flights from St. Louis to Boston that are best for you.

Fly from

St. Louis

Fly to

Boston

Route

Depart

Return

Price

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 5/2

9:50 am-6:43 pm

2 stops7h 53m

Boston Logan Intl

Sun 5/4

7:48 pm-6:41 pm

2 stops23h 53m

$258

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 4/22

9:52 am-6:37 pm

1 stop7h 45m

Boston Logan Intl

Tue 4/29

11:41 am-1:49 pm

Nonstop3h 08m

$263

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Sat 5/3

7:10 am-1:47 pm

1 stop5h 37m

Boston Logan Intl

Mon 5/5

6:50 pm-11:36 pm

1 stop5h 46m

$268

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 4/23

9:39 am-5:28 pm

2 stops6h 49m

Boston Logan Intl

Tue 4/29

5:30 am-9:58 am

1 stop5h 28m

$297

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 4/18

4:57 pm-12:59 am

1 stop7h 02m

Boston Logan Intl

Sun 4/20

6:00 am-11:46 pm

1 stop18h 46m

$318

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 5/12

9:10 pm-8:10 am

1 stop10h 00m

Boston Logan Intl

Thu 5/15

7:35 am-9:30 am

Nonstop2h 55m

$359

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 6/24

7:37 pm-12:39 am

1 stop28h 02m

Boston Logan Intl

Sat 6/28

11:56 am-6:32 pm

1 stop7h 36m

$398

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 5/8

10:10 am-11:29 pm

1 stop12h 19m

$77

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Tue 5/13

6:00 am-3:10 pm

1 stop8h 10m

$97

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 5/28

3:40 pm-12:33 am

1 stop7h 53m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 16 results
1
2

Compare providers for flights from St. Louis to Boston

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 St. Louis to Boston in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
GotogatePrice 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 St. Louis-Boston flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Boston flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Boston flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Boston 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 St. Louis-Boston 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 St. Louis to Boston

Have a flexible travel schedule? Discover the best time to fly to Boston from St. Louis 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 St. Louis to Boston

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Boston. Price data was last updated on March 21, 2025.

The best time to book flights from St. Louis to Boston is 84 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Boston (average of $218). Flying from St. Louis to Boston in July is currently the most expensive (average of $311). 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 STL to BOS?

Find hourly flight availability from St. Louis to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 26, 2025.

A simple way to save on the total cost of your ticket is to fly from St. Louis to Boston in the evening. If you’re flexible enough to do this you can expect to save up to 62% on your trip compared to booking a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Boston. Price data was last updated on March 23, 2025.

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

Rainfall in Boston by month

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

In terms of precipitation, rainfall in Boston ranges from 3.1 - 4.0 inches per month. March is typically the wettest month, when rainfall can reach 4.0 in. July is typically the driest time to visit Boston when rainfall is around 3.1 in.

Temperature in Boston by month

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

If weather is an important factor for your trip to Boston, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Boston

Get insights into the airlines that provide service to Boston. 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 Boston. Reviews last updated March 26, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta from St. Louis to Boston 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
4,274 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,274 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,789 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,891 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,608 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Boston. 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 St. Louis to Boston?

    Booking a flight from Lambert-St Louis (STL) to Boston Logan Intl (BOS) is your only option if you wish to fly from St. Louis to Boston. On a typical day, there are 4 flights from Lambert-St Louis to Logan Intl, all of which are around 2h 30m for a nonstop flight. You can also purchase a plane ticket from 6 airlines when you book a flight from Lambert-St Louis to Boston.

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

    The Lambert-St Louis to Boston Logan Intl flight path was viewed by 1 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    According to our current data, American Airlines ($263), Delta ($268), and United Airlines ($297) offers the cheapest pricing from St. Louis to Boston. Users have found that American Airlines is 37% cheaper than the other options available to this destination.

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

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $77. American Airlines flights start at $97 while deals on Delta start at $109 one-way.

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

    No one likes to see their flight delayed. When booking a flight from St. Louis to Boston consider choosing Southwest (91%), Republic Airways (88%) or Qatar Airways (86%) as they are the most reliable in getting you off to your destination on time.

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

    While on average a flight from St. Louis to Boston is generally $510, our data shows the cheapest flight currently is $190. When looking at the most popular route, (Lambert-St Louis - Boston Logan Intl), you can expect to pay $205 for that flight.

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

    Yes. In addition to deals on St. Louis to Boston flights, Cheapflights offers vacation packages that include both flights and hotel.

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Boston.

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

    Yes. Cheapflights offers flight deals from St. Louis to Boston 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 St. Louis to Boston?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Boston (average of $218). Flying from St. Louis to Boston in July is currently the most expensive (average of $311). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Warwick
Marlborough
Waltham
Cambridge
Framingham
Chestnut Hill
Seekonk
Randolph
Brockton
Lowell
West Yarmouth
Woburn
Somerville
Saco
Burlington
Smithfield
Salem
Chelsea
Seabrook
Brookline

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Top 6 airlines flying from St. Louis to Boston

Discover the top 6 airlines that operate flights from St. Louis to Boston. 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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$170FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$168Average$228FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$196Average$421FlexibilityNo cancel feeOn-time69%
DeltaCheapest$196Average$338FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$286Average$426FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$310Average$452FlexibilityNo cancel feeOn-time63%
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