$82+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — STL
May 22 — May 291
Round-trip
1 adult, Economy
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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 August or September, booked 51 days in advance, depart on a Thursday or Wednesday and return on a Wednesday
Cheap flight deals from Boston to St. Louis
Cheapest
Best
Last-minute
One-way
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 April 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 April 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/20. 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.
Thu 6/47:00 am
BOS
- STL
2 stops13h 23m
Multiple Airlines
Thu 6/116:31 pm
STL
- BOS
1 stop12h 21m
Multiple Airlines
Deal found 4/20![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 4/19. 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.
Sun 5/109:31 am
BOS
- STL
2 stops34h 52m
Frontier
Wed 5/135:27 pm
STL
- BOS
1 stop6h 57m
Frontier
Deal found 4/19![Frontier logo]()
$338
This Southwest deal was found by Cheapflights users on 4/20. 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.
Mon 5/1111:35 am
BOS
- STL
Nonstop2h 55m
Southwest
Tue 5/126:50 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/20![Southwest logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 4/20. 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.
Wed 5/1312:01 pm
BOS
- STL
1 stop29h 53m
Frontier
Sat 5/165:27 pm
STL
- BOS
1 stop6h 57m
Frontier
Deal found 4/20![Frontier logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 4/18. 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.
Fri 6/126:00 am
BOS
- STL
1 stop27h 52m
Frontier
Sun 6/146:31 pm
STL
- BOS
1 stop12h 21m
Frontier
Deal found 4/18![Frontier logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 4/21. 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.
Thu 5/710:07 am
BOS
- STL
2 stops35h 16m
Frontier
Mon 5/115:27 pm
STL
- BOS
1 stop14h 17m
Frontier
Deal found 4/21![Frontier logo]()
$343
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/306:00 am
BOS
- STL
1 stop12h 30m
Frontier
Sun 7/56:33 pm
STL
- BOS
1 stop5h 54m
Frontier
Deal found 4/20![Frontier logo]()
$344
This Southwest deal was found by Cheapflights users on 4/20. 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.
Wed 6/105:50 am
BOS
- STL
Nonstop2h 55m
Southwest
Tue 6/169:40 am
STL
- BOS
1 stop7h 20m
Southwest
Deal found 4/20![Southwest logo]()
$345
This Kiwi.com deal was found by Cheapflights users on 4/18. 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.
Fri 5/812:01 pm
BOS
- STL
1 stop21h 54m
Frontier
Mon 5/115:27 pm
STL
- BOS
1 stop14h 17m
Frontier
Deal found 4/18![Frontier logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 4/22. 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.
Wed 6/106:00 am
BOS
- STL
2 stops14h 23m
Frontier
Wed 6/175:06 pm
STL
- BOS
1 stop7h 21m
Frontier
Deal found 4/22![Frontier logo]()
$348
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:00 am
BOS
- STL
1 stop11h 54m
Frontier
Sun 5/106:55 pm
STL
- BOS
1 stop5h 29m
Frontier
Deal found 4/21![Frontier logo]()
$350
Best flights from Boston to St. LouisDiscover 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 April 22, 2026.
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 April 22, 2026.
This Southwest deal was found by Cheapflights users on 4/20. 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.
Mon 5/115:40 am
BOS
- STL
Nonstop3h 00m
Southwest
Tue 5/126:50 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/20![Southwest logo]()
$339
This Southwest deal was found by Cheapflights users on 4/17. 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.
Sat 5/303:15 pm
BOS
- STL
Nonstop2h 55m
Southwest
Mon 6/17:40 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/17![Southwest logo]()
$353
This Southwest deal was found by Cheapflights users on 4/22. 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.
Fri 5/155:40 am
BOS
- STL
Nonstop3h 00m
Southwest
Tue 5/196:50 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/22![Southwest logo]()
$375
This Southwest deal was found by Cheapflights users on 4/20. 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.
Thu 6/43:55 pm
BOS
- STL
2 stops6h 05m
Southwest
Tue 6/93:15 pm
STL
- BOS
2 stops7h 05m
Southwest
Deal found 4/20![Southwest logo]()
$390
This Southwest deal was found by Cheapflights users on 4/22. 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.
Tue 5/122:25 pm
BOS
- STL
2 stops8h 35m
Southwest
Thu 5/143:25 pm
STL
- BOS
2 stops7h 30m
Southwest
Deal found 4/22![Southwest logo]()
$429
This Southwest deal was found by Cheapflights users on 4/17. 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.
Tue 5/192:25 pm
BOS
- STL
2 stops8h 35m
Southwest
Sat 5/232:25 pm
STL
- BOS
2 stops8h 15m
Southwest
Deal found 4/17![Southwest logo]()
$432
This Southwest deal was found by Cheapflights users on 4/18. 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.
Sun 6/215:50 am
BOS
- STL
Nonstop2h 55m
Southwest
Tue 6/237:10 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/18![Southwest logo]()
$436
This Southwest deal was found by Cheapflights users on 4/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:25 am
BOS
- STL
1 stop7h 05m
Southwest
Sun 6/218:00 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/19![Southwest logo]()
$446
This Southwest deal was found by Cheapflights users on 4/18. 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.
Tue 5/55:55 pm
BOS
- STL
Nonstop3h 05m
Southwest
Tue 5/1210:15 am
STL
- BOS
Nonstop2h 35m
Southwest
Deal found 4/18![Southwest logo]()
$451
This Southwest deal was found by Cheapflights users on 4/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:50 pm
BOS
- STL
Nonstop3h 05m
Southwest
Fri 6/127:55 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/21![Southwest logo]()
$461
This Southwest deal was found by Cheapflights users on 4/17. 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.
Wed 5/65:45 am
BOS
- STL
Nonstop3h 00m
Southwest
Thu 5/77:40 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/17![Southwest logo]()
$483
Last-minute flights from Boston to St. LouisDiscover last-minute flight deals from Boston to St. Louis. Data last updated April 22, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to St. Louis. Data last updated April 22, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/20. 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.
Mon 5/46:00 am
BOS
- STL
2 stops18h 19m
Frontier
Tue 5/56:41 pm
STL
- BOS
1 stop12h 58m
Frontier
Deal found 4/20![Frontier logo]()
$348
This Kiwi.com deal was found by Cheapflights users on 4/21. 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.
Thu 5/710:07 am
BOS
- STL
2 stops35h 16m
Frontier
Mon 5/115:27 pm
STL
- BOS
1 stop14h 17m
Frontier
Deal found 4/21![Frontier logo]()
$343
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:00 am
BOS
- STL
1 stop11h 54m
Frontier
Sun 5/106:55 pm
STL
- BOS
1 stop5h 29m
Frontier
Deal found 4/21![Frontier logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 4/18. 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.
Fri 5/812:01 pm
BOS
- STL
1 stop21h 54m
Frontier
Mon 5/115:27 pm
STL
- BOS
1 stop14h 17m
Frontier
Deal found 4/18![Frontier logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 4/19. 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.
Sun 5/109:31 am
BOS
- STL
2 stops34h 52m
Frontier
Wed 5/135:27 pm
STL
- BOS
1 stop6h 57m
Frontier
Deal found 4/19![Frontier logo]()
$338
This Southwest deal was found by Cheapflights users on 4/20. 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.
Mon 5/1111:35 am
BOS
- STL
Nonstop2h 55m
Southwest
Tue 5/126:50 pm
STL
- BOS
Nonstop2h 30m
Southwest
Deal found 4/20![Southwest logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 4/20. 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.
Wed 5/1312:01 pm
BOS
- STL
1 stop29h 53m
Frontier
Sat 5/165:27 pm
STL
- BOS
1 stop6h 57m
Frontier
Deal found 4/20![Frontier logo]()
$340
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/176:00 am
BOS
- STL
1 stop11h 54m
Frontier
Tue 5/266:33 pm
STL
- BOS
1 stop12h 16m
Frontier
Deal found 4/21![Frontier logo]()
$354
This Southwest deal was found by Cheapflights users on 4/20. 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.
Wed 5/275:45 am
BOS
- STL
Nonstop3h 00m
Southwest
Tue 6/21:15 pm
STL
- BOS
1 stop5h 25m
Southwest
Deal found 4/20![Southwest logo]()
$345
This Kiwi.com deal was found by Cheapflights users on 4/21. 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.
Fri 5/2912:01 pm
BOS
- STL
1 stop21h 54m
Frontier
Sun 5/316:33 pm
STL
- BOS
1 stop12h 16m
Frontier
Deal found 4/21![Frontier logo]()
$351
This American Airlines deal was found by Cheapflights users on 4/20. 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.
Fri 5/297:00 am
BOS
- STL
Nonstop3h 09m
American Airlines
Tue 6/27:51 pm
STL
- BOS
Nonstop2h 45m
American Airlines
Deal found 4/20![American Airlines logo]()
$353
One-way flights from Boston to St. LouisSearch for one-way flight options from Boston to St. Louis. Find affordable one-way fares based on user searches. Data last updated April 22, 2026.
Search for one-way flight options from Boston to St. Louis. Find affordable one-way fares based on user searches. Data last updated April 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/18. 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.
Tue 5/199:31 am
BOS
- STL
1 stop9h 02m
Frontier
Deal found 4/18![Frontier logo]()
$82
This Super.com deal was found by Cheapflights users on 4/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
BOS
- STL
1 stop12h 33m
Frontier
Deal found 4/20![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 4/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/411:16 am
BOS
- STL
1 stop13h 03m
Frontier
Deal found 4/20![Frontier logo]()
$105
This Trip.com deal was found by Cheapflights users on 4/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/910:07 am
BOS
- STL
1 stop15h 14m
Frontier
Deal found 4/21![Frontier logo]()
$109
This Orbitz deal was found by Cheapflights users on 4/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/166:00 am
BOS
- STL
1 stop12h 30m
Frontier
Deal found 4/18![Frontier logo]()
$111
This Super.com deal was found by Cheapflights users on 4/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1110:17 am
BOS
- STL
1 stop15h 04m
Frontier
Deal found 4/20![Frontier logo]()
$116
This Priceline deal was found by Cheapflights users on 4/22. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/149:31 am
BOS
- STL
1 stop8h 23m
Frontier
Deal found 4/22![Frontier logo]()
$121
This Super.com deal was found by Cheapflights users on 4/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2811:16 am
BOS
- STL
1 stop13h 03m
Frontier
Deal found 4/20![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/310:53 am
BOS
- STL
1 stop13h 26m
Frontier
Deal found 4/21![Frontier logo]()
$127
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 April 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $337 (Kiwi.com) |
One-way from | $82 (Kiwi.com) |
Popular in | March |
Cheapest in | August |
Average price | $521 |
Good round-trip deal | $396 or less |
Good one-way deal | $209 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Boston to St. Louis 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 April 22, 2026.
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
Cheapest round-trip
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Mon 5/11
5:40 am-7:40 am
Nonstop3h 00m
Lambert-St Louis
Tue 5/12
6:50 pm-10:20 pm
Nonstop2h 30m
$339
Quickest round-trip
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Sat 5/30
3:15 pm-5:10 pm
Nonstop2h 55m
Lambert-St Louis
Mon 6/1
7:40 pm-11:10 pm
Nonstop2h 30m
$353
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Fri 5/15
5:40 am-7:40 am
Nonstop3h 00m
Lambert-St Louis
Tue 5/19
6:50 pm-10:20 pm
Nonstop2h 30m
$375
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Thu 6/4
3:55 pm-9:00 pm
2 stops6h 05m
Lambert-St Louis
Tue 6/9
3:15 pm-11:20 pm
2 stops7h 05m
$390
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Tue 5/12
2:25 pm-10:00 pm
2 stops8h 35m
Lambert-St Louis
Thu 5/14
3:25 pm-11:55 pm
2 stops7h 30m
$429
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Tue 5/19
2:25 pm-10:00 pm
2 stops8h 35m
Lambert-St Louis
Sat 5/23
2:25 pm-11:40 pm
2 stops8h 15m
$432
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Sun 6/21
5:50 am-7:45 am
Nonstop2h 55m
Lambert-St Louis
Tue 6/23
7:10 pm-10:40 pm
Nonstop2h 30m
$436
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Wed 6/17
5:25 am-11:30 am
1 stop7h 05m
Lambert-St Louis
Sun 6/21
8:00 pm-11:30 pm
Nonstop2h 30m
$446
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Tue 5/5
5:55 pm-8:00 pm
Nonstop3h 05m
Lambert-St Louis
Tue 5/12
10:15 am-1:50 pm
Nonstop2h 35m
$451
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Thu 6/11
6:50 pm-8:55 pm
Nonstop3h 05m
Lambert-St Louis
Fri 6/12
7:55 pm-11:25 pm
Nonstop2h 30m
$461
Showing 1-10 of 19 resultsSorted by cheapest first
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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| 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 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 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.
BOS-STL
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
Prices
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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 April 17, 2026.
To ensure you get the cheapest price possible for a flight from Boston to St. Louis, you should look to book at least 51 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 $381). Flying from Boston to St. Louis in March is currently the most expensive (average of $528). 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?
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 April 22, 2026.
It’s typically best to fly out from Boston to St. Louis in the evening. Doing so could potentially save you 9% 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?
Use this chart to determine the cheapest time to fly round-trip from Boston to St. Louis. Price data was last updated on April 18, 2026.
Travelers seeking maximum savings on their Boston to St. Louis flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday 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 19% of weekly flights between Boston and St. Louis have experienced delays in the past year, with the average delay time being 141 minutes.
What is the most punctual flight time for Boston to St. Louis flights?
Historically, flights departing in the morning 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?
Tuesday 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 13% of flights being delayed.
What’s the top layover airport for flights from Boston to St. Louis?
Share of 1-stop round-trip flights from Boston to St. Louis chosen by Cheapflights users in the past 12 months, using the same layover each way.
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?
Average round-trip fare for 1-stop flights from Boston to St. Louis, chosen by Cheapflights users in the past 12 months, with the same layover each way.
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?
Shortest average travel time for 1-stop one-way flights from Boston to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
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?
Average layover duration for 1-stop one-way flights from Boston to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
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 April 22, 2026.
Read through reviews of airlines operating flights from Boston to St. Louis, such as Southwest,Delta, andJetBlue. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus
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Boston and St. Louis flights
Browse other Boston and St. Louis flight options. Last updated on April 22, 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on April 22, 2026.
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Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on April 22, 2026.
Top 6 airlines flying from Boston to St. Louis
Discover the top 6 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 April 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$63 | Average$226 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$90 | Average$255 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$148 | Average$437 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$284 | Average$462 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$313 | Average$477 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$327 | Average$430 | FlexibilityNo cancel fee | On-time62% |