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$162+ 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 8/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOS
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Boston Logan Intl are usually found in September or August, booked 84 days in advance, depart on a Thursday or Friday and return on a Wednesday

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 July 3, 2025.

Round-trip from

$289
(FlightHub)

One-way from

$162
(Mytrip)

Popular in

June

Cheapest in

September

Average price

$442

Good round-trip deal

$422 or less

Good one-way deal

$210 or less
From Lambert-St Louis to Boston Logan Intl
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One-way flight from Lambert-St Louis to Boston Logan Intl
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Highest demand for flights based on searches. 5% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($3 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 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 July 3, 2025.

This Mytrip deal was found by Cheapflights users on 7/3. 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.
Thu 7/1710:47 amSTL - BOS
2 stops21h 11mSpirit Airlines
Tue 7/296:10 amBOS - STL
1 stop11h 21mSpirit Airlines
Deal found 7/3$287
This American Airlines deal was found by Cheapflights users on 7/2. 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.
Thu 10/231:30 pmSTL - BOS
1 stop7h 39mAmerican Airlines
Thu 10/306:50 amBOS - STL
Nonstop3h 14mAmerican Airlines
Deal found 7/2$290
This FlightHub deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/185:40 pmSTL - BOS
1 stop13h 55mMultiple Airlines
Sun 7/206:10 amBOS - STL
1 stop11h 21mMultiple Airlines
Deal found 7/3$293
This FlightHub deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/185:40 pmSTL - BOS
1 stop13h 55mFrontier
Mon 7/219:40 amBOS - STL
1 stop15h 07mFrontier
Deal found 7/3$303
This Southwest deal was found by Cheapflights users on 7/3. 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.
Thu 10/28:10 pmSTL - BOS
Nonstop2h 30mSouthwest
Sun 10/55:20 amBOS - STL
1 stop7h 40mSouthwest
Deal found 7/3$322
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/35:11 pmSTL - BOS
1 stop7h 07mDelta
Tue 10/77:00 amBOS - STL
1 stop6h 25mDelta
Deal found 7/3$332

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 July 3, 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

Thu 7/17

10:47 am-8:58 am

2 stops21h 11m

Boston Logan Intl

Tue 7/29

6:10 am-4:31 pm

1 stop11h 21m

$287

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 10/23

1:30 pm-10:09 pm

1 stop7h 39m

Boston Logan Intl

Thu 10/30

6:50 am-9:04 am

Nonstop3h 14m

$290

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 7/18

5:40 pm-8:35 am

1 stop13h 55m

Boston Logan Intl

Sun 7/20

6:10 am-4:31 pm

1 stop11h 21m

$293

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 7/18

5:40 pm-8:35 am

1 stop13h 55m

Boston Logan Intl

Mon 7/21

9:40 am-11:47 pm

1 stop15h 07m

$303

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 10/2

8:10 pm-11:40 pm

Nonstop2h 30m

Boston Logan Intl

Sun 10/5

5:20 am-12:00 pm

1 stop7h 40m

$322

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 10/3

5:11 pm-1:18 am

1 stop7h 07m

Boston Logan Intl

Tue 10/7

7:00 am-12:25 pm

1 stop6h 25m

$332

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Fri 8/8

10:47 am-6:21 pm

3 stops30h 34m

$162

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Wed 9/17

7:55 pm-9:58 am

2 stops13h 03m

$163

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Thu 11/20

6:01 am-11:18 am

1 stop4h 17m

$167

St. LouisBoston

STL - BOS

STLBOS

Lambert-St Louis

Mon 9/29

9:50 am-11:13 am

3 stops24h 23m

$171

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 13 results
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The best insider tips for St. Louis to Boston flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Boston trip
Airports
STL

Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

Read more about STLby Taryn White
BOS

BOS offers rideshare services like Uber and Lyft with designated pickup points. Allow extra travel time due to unpredictable traffic.

Read more about BOSby Paul Rubio
Our travel experts
Paul Rubio

Paul Rubio

Expert on BOS

Paul Rubio

Paul Rubio

Travel journalist and photographer Paul Rubio is a Miami native (and current resident), who has lived in nine countries and traveled to 137. He is an expert in luxury travel, eco-travel, loyalty programs, hotels, airports and airlines. He is a contributing editor at AFAR, Condé Nast Traveler, LUXURY Magazine, and Palm Beach Illustrated.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

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 June 27, 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 June is currently the most expensive (average of $306). 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 July 3, 2025.

A simple way to save on the total cost of your ticket is to fly from St. Louis to Boston in the afternoon. If you’re flexible enough to do this you can expect to save up to 61% 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 June 29, 2025.

Travelers seeking maximum savings on their St. Louis to Boston flight should consider departing on Wednesday afternoons 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.

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 July 3, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from St. Louis to Boston. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,266 reviews

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Food

7.0

Comfort

8.0

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

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Food

7.0

Comfort

8.0

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

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Food

7.0

Comfort

8.0

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

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Food

7.0

Comfort

8.0

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

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Food

7.0

Comfort

8.0

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

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Food

7.0

Comfort

8.0

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

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 2 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, Spirit Airlines ($289), American Airlines ($292), and Frontier ($303) offers the cheapest pricing from St. Louis to Boston. Users have found that Spirit Airlines is 31% 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 $162. Frontier flights start at $163 while deals on American Airlines start at $167 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 Iberia (77%), Republic Airways (73%) or Qatar Airways (71%) 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 $1,139, our data shows the cheapest flight currently is $168. When looking at the most popular route, (Lambert-St Louis - Boston Logan Intl), you can expect to pay $139 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 June is currently the most expensive (average of $306). 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
Cambridge
Medford
Watertown
Warwick
Seabrook
Waltham
Framingham
Cranston
Randolph
Chestnut Hill
Chelsea
Brockton
York Beach
Saco
Burlington
West Yarmouth
Smithfield
Swansea
Lincoln
Quincy

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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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$105Average$202FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$153Average$413FlexibilityNo cancel feeOn-time69%
Spirit AirlinesCheapest$168Average$253FlexibilityNo cancel feeOn-time65%
DeltaCheapest$196Average$284FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$269Average$423FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$311Average$451FlexibilityNo cancel feeOn-time63%

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