$102+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — STL
Jul 31 — Aug 71
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 Wednesday or Thursday and return on a Wednesday
Cheap flight deals from Boston to St. Louis
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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 July 1, 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 July 1, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/2111:52 am
BOS
- STL
1 stop6h 45m
Frontier
Thu 7/238:08 pm
STL
- BOS
2 stops34h 34m
Frontier
Deal found 6/30![Frontier logo]()
$341
This United Airlines deal was found by Cheapflights users on 6/26. 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.
Tue 9/15:45 am
BOS
- STL
1 stop4h 54m
United Airlines
Thu 9/37:00 am
STL
- BOS
1 stop6h 22m
United Airlines
Deal found 6/26![United Airlines logo]()
$342
This Frontier deal was found by Cheapflights users on 6/30. 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.
Fri 10/99:15 am
BOS
- STL
1 stop11h 24m
Frontier
Sun 10/118:34 pm
STL
- BOS
1 stop10h 46m
Frontier
Deal found 6/30![Frontier logo]()
$346
This Delta deal was found by Cheapflights users on 6/26. 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.
Thu 8/135:30 am
BOS
- STL
1 stop5h 07m
Delta
Mon 8/176:25 pm
STL
- BOS
1 stop4h 34m
Delta
Deal found 6/26![Delta logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 6/26. 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 7/228:41 am
BOS
- STL
2 stops16h 18m
Frontier
Sun 7/266:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 6/26![Frontier logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/2311:52 am
BOS
- STL
1 stop6h 45m
Frontier
Sat 7/258:08 pm
STL
- BOS
2 stops36h 01m
Frontier
Deal found 6/30![Frontier logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/228:41 am
BOS
- STL
2 stops16h 18m
Frontier
Sat 7/254:09 pm
STL
- BOS
1 stop16h 00m
Frontier
Deal found 6/30![Frontier logo]()
$351
This Super.com deal was found by Cheapflights users on 6/27. 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 7/2710:04 am
BOS
- STL
1 stop14h 55m
Frontier
Mon 8/34:09 pm
STL
- BOS
1 stop16h 00m
Frontier
Deal found 6/27![Frontier logo]()
$353
This Frontier deal was found by Cheapflights users on 6/30. 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 7/711:52 am
BOS
- STL
1 stop6h 45m
Frontier
Thu 7/96:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 6/30![Frontier logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/2311:52 am
BOS
- STL
1 stop6h 45m
Frontier
Sun 7/268:08 pm
STL
- BOS
2 stops36h 01m
Frontier
Deal found 6/30![Frontier logo]()
$357
This Kiwi.com deal was found by Cheapflights users on 6/29. 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 8/78:41 am
BOS
- STL
2 stops25h 16m
Frontier
Sun 8/96:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 6/29![Frontier logo]()
$358
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 July 1, 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 July 1, 2026.
This Southwest deal was found by Cheapflights users on 6/28. 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 9/222:45 pm
BOS
- STL
2 stops7h 55m
Southwest
Sat 9/266:50 am
STL
- BOS
2 stops8h 00m
Southwest
Deal found 6/28![Southwest logo]()
$363
This Delta deal was found by Cheapflights users on 6/26. 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.
Wed 12/211:00 am
BOS
- STL
1 stop7h 58m
Delta
Sun 12/63:40 pm
STL
- BOS
1 stop4h 47m
Delta
Deal found 6/26![Delta logo]()
$395
This United Airlines deal was found by Cheapflights users on 6/27. 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 7/297:19 am
BOS
- STL
1 stop5h 52m
United Airlines
Mon 8/31:13 pm
STL
- BOS
2 stops9h 46m
United Airlines
Deal found 6/27![United Airlines logo]()
$490
This Southwest deal was found by Cheapflights users on 6/28. 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 8/78:40 am
BOS
- STL
2 stops12h 15m
Southwest
Wed 8/1212:50 pm
STL
- BOS
2 stops7h 35m
Southwest
Deal found 6/28![Southwest logo]()
$409
This Southwest deal was found by Cheapflights users on 6/29. 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 7/215:50 am
BOS
- STL
Nonstop2h 55m
Southwest
Thu 7/235:20 pm
STL
- BOS
1 stop5h 50m
Southwest
Deal found 6/29![Southwest logo]()
$413
This Delta deal was found by Cheapflights users on 6/27. 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 9/41:00 pm
BOS
- STL
1 stop8h 31m
Delta
Mon 9/75:23 pm
STL
- BOS
1 stop5h 18m
Delta
Deal found 6/27![Delta logo]()
$481
This United Airlines deal was found by Cheapflights users on 6/26. 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 12/26:00 am
BOS
- STL
2 stops9h 30m
United Airlines
Sun 12/67:33 am
STL
- BOS
1 stop5h 29m
United Airlines
Deal found 6/26![United Airlines logo]()
$490
This Southwest deal was found by Cheapflights users on 6/29. 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 8/138:40 am
BOS
- STL
2 stops12h 15m
Southwest
Thu 8/202:45 pm
STL
- BOS
2 stops6h 25m
Southwest
Deal found 6/29![Southwest logo]()
$449
This Southwest deal was found by Cheapflights users on 6/30. 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 9/33:35 pm
BOS
- STL
1 stop7h 05m
Southwest
Mon 9/72:45 pm
STL
- BOS
2 stops6h 25m
Southwest
Deal found 6/30![Southwest logo]()
$451
This Southwest deal was found by Cheapflights users on 6/29. 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 7/316:50 pm
BOS
- STL
Nonstop3h 05m
Southwest
Fri 8/74:15 pm
STL
- BOS
1 stop4h 55m
Southwest
Deal found 6/29![Southwest logo]()
$471
This Southwest deal was found by Cheapflights users on 6/30. 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 12/216:30 am
BOS
- STL
2 stops9h 55m
Southwest
Tue 12/295:05 am
STL
- BOS
2 stops8h 15m
Southwest
Deal found 6/30![Southwest logo]()
$476
This Southwest deal was found by Cheapflights users on 6/29. 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 9/41:30 pm
BOS
- STL
2 stops9h 35m
Southwest
Sun 9/68:20 am
STL
- BOS
2 stops9h 35m
Southwest
Deal found 6/29![Southwest logo]()
$491
Last-minute flights from Boston to St. LouisDiscover last-minute flight deals from Boston to St. Louis. Data last updated July 1, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to St. Louis. Data last updated July 1, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/30. 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 7/711:52 am
BOS
- STL
1 stop6h 45m
Frontier
Thu 7/96:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 6/30![Frontier logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 6/29. 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 7/1711:59 am
BOS
- STL
1 stop21h 58m
Frontier
Sun 7/196:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 6/29![Frontier logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/2111:52 am
BOS
- STL
1 stop6h 45m
Frontier
Thu 7/238:08 pm
STL
- BOS
2 stops34h 34m
Frontier
Deal found 6/30![Frontier logo]()
$341
This Kiwi.com deal was found by Cheapflights users on 6/26. 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 7/228:41 am
BOS
- STL
2 stops16h 18m
Frontier
Sun 7/266:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 6/26![Frontier logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/228:41 am
BOS
- STL
2 stops16h 18m
Frontier
Sat 7/254:09 pm
STL
- BOS
1 stop16h 00m
Frontier
Deal found 6/30![Frontier logo]()
$351
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/2311:52 am
BOS
- STL
1 stop6h 45m
Frontier
Sat 7/258:08 pm
STL
- BOS
2 stops36h 01m
Frontier
Deal found 6/30![Frontier logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/2311:52 am
BOS
- STL
1 stop6h 45m
Frontier
Sun 7/268:08 pm
STL
- BOS
2 stops36h 01m
Frontier
Deal found 6/30![Frontier logo]()
$357
This Super.com deal was found by Cheapflights users on 6/27. 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 7/2710:04 am
BOS
- STL
1 stop14h 55m
Frontier
Mon 8/34:09 pm
STL
- BOS
1 stop16h 00m
Frontier
Deal found 6/27![Frontier logo]()
$353
This Kiwi.com deal was found by Cheapflights users on 6/28. 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 7/2710:04 am
BOS
- STL
1 stop14h 55m
Frontier
Mon 8/174:57 pm
STL
- BOS
1 stop17h 50m
Frontier
Deal found 6/28![Frontier logo]()
$363
This KAYAK deal was found by Cheapflights users on 6/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/286:45 am
BOS
- STL
1 stop6h 32m
Delta
Wed 7/296:00 am
STL
- BOS
1 stop8h 18m
Delta
Deal found 6/30![Delta logo]()
$368
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 July 1, 2026.
Search for one-way flight options from Boston to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 1, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/29. 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 8/1111:59 am
BOS
- STL
1 stop6h 38m
Frontier
Deal found 6/29![Frontier logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 6/29. 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 8/1211:59 am
BOS
- STL
1 stop30h 38m
Frontier
Deal found 6/29![Frontier logo]()
$103
This Super.com deal was found by Cheapflights users on 6/30. 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 8/411:52 am
BOS
- STL
1 stop6h 45m
Frontier
Deal found 6/30![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 6/28. 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 8/2612:45 pm
BOS
- STL
1 stop29h 37m
Frontier
Deal found 6/28![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 6/28. 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.
Sat 8/2212:45 pm
BOS
- STL
1 stop29h 37m
Frontier
Deal found 6/28![Frontier logo]()
$107
This Expedia deal was found by Cheapflights users on 6/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2810:04 am
BOS
- STL
1 stop14h 55m
Frontier
Deal found 6/30![Frontier logo]()
$123
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 7/3011:52 am
BOS
- STL
1 stop6h 45m
Frontier
Deal found 6/30![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 9/291:00 pm
BOS
- STL
1 stop21h 40m
Frontier
Deal found 6/30![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 6/30. 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.
Thu 8/2010:04 am
BOS
- STL
1 stop7h 07m
Frontier
Deal found 6/30![Frontier logo]()
$127
This Super.com deal was found by Cheapflights users on 6/26. 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.
Thu 8/1311:59 am
BOS
- STL
1 stop6h 38m
Frontier
Deal found 6/26![Frontier logo]()
$128
This Frontier deal was found by Cheapflights users on 6/30. 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 8/279:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 6/30![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 6/28. 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 7/2311:52 am
BOS
- STL
1 stop22h 05m
Frontier
Deal found 6/28![Frontier logo]()
$130
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 July 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $342 (United Airlines) |
One-way from | $102 (Kiwi.com) |
Popular in | July |
Cheapest in | August |
Average price | $576 |
Good round-trip deal | $385 or less |
Good one-way deal | $208 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 July 1, 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
Tue 9/22
2:45 pm-9:40 pm
2 stops7h 55m
Lambert-St Louis
Sat 9/26
6:50 am-3:50 pm
2 stops8h 00m
$363
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Wed 12/2
11:00 am-5:58 pm
1 stop7h 58m
Lambert-St Louis
Sun 12/6
3:40 pm-9:27 pm
1 stop4h 47m
$395
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Fri 8/7
8:40 am-7:55 pm
2 stops12h 15m
Lambert-St Louis
Wed 8/12
12:50 pm-9:25 pm
2 stops7h 35m
$409
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Tue 7/21
5:50 am-7:45 am
Nonstop2h 55m
Lambert-St Louis
Thu 7/23
5:20 pm-12:10 am
1 stop5h 50m
$413
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Thu 8/13
8:40 am-7:55 pm
2 stops12h 15m
Lambert-St Louis
Thu 8/20
2:45 pm-10:10 pm
2 stops6h 25m
$449
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Thu 9/3
3:35 pm-9:40 pm
1 stop7h 05m
Lambert-St Louis
Mon 9/7
2:45 pm-10:10 pm
2 stops6h 25m
$451
Quickest round-trip
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Fri 7/31
6:50 pm-8:55 pm
Nonstop3h 05m
Lambert-St Louis
Fri 8/7
4:15 pm-10:10 pm
1 stop4h 55m
$471
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Mon 12/21
6:30 am-3:25 pm
2 stops9h 55m
Lambert-St Louis
Tue 12/29
5:05 am-2:20 pm
2 stops8h 15m
$476
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Fri 9/4
1:00 pm-8:31 pm
1 stop8h 31m
Lambert-St Louis
Mon 9/7
5:23 pm-11:41 pm
1 stop5h 18m
$481
BostonSt. Louis
BOS - STL
BOSSTL
Boston Logan Intl
Wed 7/29
7:19 am-12:11 pm
1 stop5h 52m
Lambert-St Louis
Mon 8/3
1:13 pm-11:59 pm
2 stops9h 46m
$490
Showing 1-10 of 23 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 July.
| 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 Accuracy1 star | Trust Score*3 stars |
- 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
Delays
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 50 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 $375). Flying from Boston to St. Louis in July is currently the most expensive (average of $576). 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 July 1, 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 in the afternoon, 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 June 27, 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 140 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 14% of flights being delayed.
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 July 1, 2026.
Read through reviews of airlines operating flights from Boston to St. Louis, such as Southwest,Delta, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
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
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Alton
Farmington
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Boston and St. Louis flights
Browse other Boston and St. Louis flight options. Last updated on July 1, 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 July 1, 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 July 1, 2026.
Top 5 airlines flying from Boston to St. Louis
Discover the top 5 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 July 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$90 | Average$255 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$148 | Average$516 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$283 | Average$493 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$316 | Average$496 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$327 | Average$430 | FlexibilityNo cancel fee | On-time62% |