$63+ 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 1/29. 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
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.Cheap 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 January 22, 2026.
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 January 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 1/20. 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.
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 1/20. 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.
This Southwest deal was found by Cheapflights users on 1/20. 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.
This American Airlines deal was found by Cheapflights users on 1/21. 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.
Find flight deals from Boston to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to St. Louis (STL). 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 January 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | Expedia 3 stars |
Round-trip from | $320 (Kiwi.com) |
One-way from | $63 (Trip.com) |
Popular in | April |
Cheapest in | August |
Average price | $441 |
Good round-trip deal | $365 or less |
Good one-way deal | $197 or less |
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
Wed 2/18
6:25 am-8:45 am
Nonstop3h 20m
Lambert-St Louis
Tue 2/24
5:55 pm-9:25 pm
Nonstop2h 30m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Tue 4/7
5:55 pm-8:00 pm
Nonstop3h 05m
Lambert-St Louis
Sat 4/11
1:45 pm-5:20 pm
Nonstop2h 35m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Wed 4/1
5:30 am-7:35 am
Nonstop3h 05m
Lambert-St Louis
Thu 4/9
3:00 pm-12:50 am
1 stop8h 50m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Thu 5/7
5:40 am-7:40 am
Nonstop3h 00m
Lambert-St Louis
Mon 5/11
2:30 pm-6:05 pm
Nonstop2h 35m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Sat 2/28
5:15 am-9:05 am
1 stop4h 50m
Lambert-St Louis
Mon 3/2
2:20 pm-10:55 pm
2 stops7h 35m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Wed 2/25
9:05 am-11:29 am
Nonstop3h 24m
Lambert-St Louis
Sun 3/1
5:50 pm-9:30 pm
Nonstop2h 40m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Wed 5/13
5:45 am-7:45 am
Nonstop3h 00m
Lambert-St Louis
Sun 5/17
7:55 pm-11:25 pm
Nonstop2h 30m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Tue 3/24
5:30 am-7:35 am
Nonstop3h 05m
Lambert-St Louis
Fri 3/27
7:45 pm-11:10 pm
Nonstop2h 25m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Sun 5/3
5:40 am-7:40 am
Nonstop3h 00m
Lambert-St Louis
Tue 5/5
6:50 pm-10:20 pm
Nonstop2h 30m
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Thu 3/26
12:00 pm-4:31 pm
1 stop5h 31m
Lambert-St Louis
Mon 3/30
6:59 pm-1:13 am
1 stop5h 14m
Compare providers for flights from Boston to St. Louis
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 Boston to St. Louis in January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Boston-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Boston-St. Louis flights, Cheapflights users trust Expedia the most. Expedia 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 Boston-St. Louis 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 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?
To ensure you get the cheapest price possible for a flight from Boston to St. Louis, you should look to book at least 47 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 $179). Flying from Boston to St. Louis in July is currently the most expensive (average of $300). 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 6% 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 Monday evenings when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
How often are flights from Boston to St. Louis delayed?
About 18% of weekly flights between Boston and St. Louis have experienced delays in the past year, with the average delay time being 139 minutes.
What is the most punctual flight time for Boston to St. Louis flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Boston to St. Louis flights?
Over the last year, American Airlines have had the lowest number of delays on this route, with just 12% of flights being delayed.
What’s the top layover airport for flights from Boston to St. Louis?
Chicago (ORD) – chosen by Cheapflights users on 67% of 1-stop itineraries from Boston to St. Louis on Cheapflights.
What’s the cheapest layover airport for flights from Boston to St. Louis?
Fort Lauderdale (FLL) is the most affordable 1-stop option, with an average round-trip price of $245.
What’s the fastest layover option from Boston to St. Louis?
Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 12h 30m.
Which airport typically offers the quickest layover for flights from Boston to St. Louis?
Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 7h 05m.
The best insider tips for Boston to St. Louis flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to St. Louis trip
Our travel experts
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated January 22, 2026.
Read through reviews of airlines operating flights from Boston to St. Louis, such as Southwest, Delta, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
Crew
Boarding
Overall
Food
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Overall
Food
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Overall
Food
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Overall
Food
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Overall
Food
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
Comfort
Crew
Boarding
Overall
Food
Entertainment
Reviews
Thomas,Dec 2025
SEA - DEN
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.
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Alternative routes for Boston to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from Boston to St. Louis
Discover the top 7 airlines that operate flights from Boston to St. Louis. 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 January 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$63 | Average$226 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$90 | Average$270 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$154 | Average$316 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$288 | Average$456 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$292 | Average$443 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$321 | Average$468 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$385 | Average$430 | FlexibilityNo cancel fee | On-time62% |