$134+ Cheap flights from St. Louis to Boston (STL - BOS)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/21. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOS
Oct 28 — Nov 41
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Boston 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 Lambert-St Louis to Boston Logan Intl are usually found in September or November, booked 78 days in advance, depart on a Wednesday or Friday and return on a Wednesday
Cheap flight deals from St. Louis to Boston
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to BostonExplore 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 September 28, 2026.
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 September 28, 2026.
This CheapOair deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/164:30 pm -
1 stop17h 32m
Thu 10/2211:47 am -
1 stop12h 26m
Deal found 9/25![Frontier logo]()
$323
This Frontier deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/197:24 pm -
1 stop11h 17m
Sun 11/2211:06 am -
1 stop13h 53m
Deal found 9/24![Frontier logo]()
$325
This American Airlines deal was found by Cheapflights users on 9/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2711:32 am -
1 stop8h 27m
Tue 11/38:16 am -
1 stop5h 34m
Deal found 9/27![American Airlines logo]()
$326
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/97:55 pm -
Nonstop2h 30m
Thu 11/127:45 pm -
1 stop5h 25m
Deal found 9/27![Southwest logo]()
$327
This American Airlines deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1711:31 am -
1 stop8h 28m
Thu 10/225:54 am -
1 stop5h 56m
Deal found 9/24![American Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:40 pm -
2 stops6h 15m
Mon 11/95:10 am -
Nonstop3h 05m
Deal found 9/24![Southwest logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 10/216:35 pm -
2 stops39h 27m
Sat 10/2411:47 am -
1 stop12h 26m
Deal found 9/26![Frontier logo]()
$333
This CheapOair deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/225:59 pm -
1 stop15h 12m
Fri 11/2711:06 am -
1 stop13h 53m
Deal found 9/25![Frontier logo]()
$335
This American Airlines deal was found by Cheapflights users on 9/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:48 am -
1 stop6h 53m
Mon 11/27:40 pm -
1 stop5h 19m
Deal found 9/28![American Airlines logo]()
$337
This CheapOair deal was found by Cheapflights users on 9/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:35 pm -
1 stop12h 06m
Sun 11/2911:06 am -
1 stop26h 19m
Deal found 9/27![Frontier logo]()
$338
This Southwest deal was found by Cheapflights users on 9/23. 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 10/274:05 pm -
1 stop4h 25m
Tue 11/32:25 pm -
2 stops8h 30m
Deal found 9/23![Southwest logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:59 pm -
1 stop15h 12m
Fri 11/278:36 am -
1 stop10h 04m
Deal found 9/25![Frontier logo]()
$345
Best flights from St. Louis to BostonDiscover carefully curated flight deals from St. Louis to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 28, 2026.
Discover carefully curated flight deals from St. Louis to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 28, 2026.
This Southwest deal was found by Cheapflights users on 9/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/510:50 am -
Nonstop2h 30m
Tue 12/81:20 pm -
2 stops7h 05m
Deal found 9/26![Southwest logo]()
$332
This United Airlines deal was found by Cheapflights users on 9/27. 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 10/217:30 am -
1 stop6h 05m
Fri 10/303:01 pm -
1 stop5h 22m
Deal found 9/27![United Airlines logo]()
$362
This Delta deal was found by Cheapflights users on 9/26. 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.
Fri 10/1610:30 am -
1 stop6h 32m
Sat 10/179:15 am -
1 stop7h 22m
Deal found 9/26![Delta logo]()
$489
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/102:20 pm -
2 stops6h 35m
Sat 11/147:25 am -
1 stop7h 55m
Deal found 9/27![Southwest logo]()
$342
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/278:30 am -
2 stops6h 35m
Thu 10/291:05 pm -
1 stop5h 05m
Deal found 9/25![Southwest logo]()
$342
This Southwest deal was found by Cheapflights users on 9/23. 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 10/291:00 pm -
1 stop5h 15m
Mon 11/22:25 pm -
2 stops7h 35m
Deal found 9/23![Southwest logo]()
$372
This Delta deal was found by Cheapflights users on 9/23. 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 3/246:00 am -
1 stop6h 49m
Tue 3/305:45 am -
1 stop6h 03m
Deal found 9/23![Delta logo]()
$501
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:20 am -
2 stops7h 00m
Tue 10/273:50 pm -
2 stops7h 15m
Deal found 9/27![Southwest logo]()
$407
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/234:30 pm -
2 stops6h 40m
Mon 10/2610:40 am -
2 stops9h 25m
Deal found 9/25![Southwest logo]()
$502
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:15 am -
2 stops8h 15m
Sun 11/152:25 pm -
2 stops7h 35m
Deal found 9/27![Southwest logo]()
$529
This Southwest deal was found by Cheapflights users on 9/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/177:20 am -
1 stop5h 40m
Sun 10/185:35 am -
2 stops7h 00m
Deal found 9/26![Southwest logo]()
$557
This Southwest deal was found by Cheapflights users on 9/23. 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 11/274:40 pm -
2 stops6h 15m
Mon 11/306:30 am -
2 stops9h 55m
Deal found 9/23![Southwest logo]()
$570
Last-minute flights from St. Louis to BostonDiscover last-minute flight deals from St. Louis to Boston. Data last updated September 28, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Boston. Data last updated September 28, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:30 pm -
1 stop17h 32m
Mon 10/1911:47 am -
1 stop12h 26m
Deal found 9/24![Frontier logo]()
$338
This CheapOair deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/164:30 pm -
1 stop17h 32m
Thu 10/2211:47 am -
1 stop12h 26m
Deal found 9/25![Frontier logo]()
$323
This American Airlines deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1711:31 am -
1 stop8h 28m
Thu 10/225:54 am -
1 stop5h 56m
Deal found 9/24![American Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/195:55 am -
Nonstop2h 35m
Wed 11/112:25 pm -
2 stops8h 35m
Deal found 9/27![Southwest logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 10/216:35 pm -
2 stops39h 27m
Sat 10/2411:47 am -
1 stop12h 26m
Deal found 9/26![Frontier logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/234:30 pm -
1 stop17h 32m
Fri 10/3012:39 pm -
2 stops31h 35m
Deal found 9/25![Frontier logo]()
$349
This American Airlines deal was found by Cheapflights users on 9/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:10 pm -
Nonstop2h 47m
Mon 10/266:16 pm -
1 stop7h 03m
Deal found 9/28![American Airlines logo]()
$357
This American Airlines deal was found by Cheapflights users on 9/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2711:32 am -
1 stop8h 27m
Tue 11/38:16 am -
1 stop5h 34m
Deal found 9/27![American Airlines logo]()
$326
This American Airlines deal was found by Cheapflights users on 9/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:00 am -
Nonstop2h 44m
Mon 11/21:30 pm -
1 stop6h 52m
Deal found 9/27![American Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/278:30 am -
2 stops6h 35m
Thu 10/291:05 pm -
1 stop5h 05m
Deal found 9/25![Southwest logo]()
$342
This Southwest deal was found by Cheapflights users on 9/23. 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 10/278:30 am -
2 stops7h 40m
Tue 11/32:25 pm -
2 stops8h 45m
Deal found 9/23![Southwest logo]()
$347
This American Airlines deal was found by Cheapflights users on 9/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:48 am -
1 stop6h 53m
Mon 11/27:40 pm -
1 stop5h 19m
Deal found 9/28![American Airlines logo]()
$337
One-way flights from St. Louis to BostonSearch for one-way flight options from St. Louis to Boston. Find affordable one-way fares based on user searches. Data last updated September 28, 2026.
Search for one-way flight options from St. Louis to Boston. Find affordable one-way fares based on user searches. Data last updated September 28, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:59 pm -
1 stop15h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$134
This Super.com deal was found by Cheapflights users on 9/27. 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.
Tue 11/245:59 pm -
1 stop15h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$143
This Frontier deal was found by Cheapflights users on 9/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:35 pm -
1 stop12h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$145
This Trip.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/234:30 pm -
1 stop17h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$147
This Mytrip deal was found by Cheapflights users on 9/23. 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.
Mon 10/196:35 pm -
1 stop16h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:35 pm -
1 stop14h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 11/96:44 pm -
1 stop15h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$153
This Super.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:30 pm -
1 stop17h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$157
This American Airlines deal was found by Cheapflights users on 9/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:10 pm -
Nonstop2h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![American Airlines logo]()
$159
Find 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 September 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $323 (CheapOair) |
One-way from | $134 (Kiwi.com) |
Popular in | February |
Cheapest in | September |
Average price | $442 |
Good round-trip deal | $435 or less |
Good one-way deal | $304 or less |
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 7,457,451 searches. Data last updated September 28, 2026.
Use the filters below to find and compare flights from St. Louis to Boston that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Tue 10/27
7:00 am-1:29 pm
1 stop5h 29m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Mon 11/23
8:30 am-3:58 pm
1 stop6h 28m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Wed 10/21
6:00 am-12:42 pm
1 stop5h 42m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Mon 12/21
6:21 pm-11:59 pm
1 stop4h 38m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Wed 10/28
7:00 am-2:25 pm
1 stop6h 25m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Sat 11/7
12:00 pm-9:08 pm
1 stop8h 08m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$169
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Thu 11/5
4:40 pm-11:55 pm
2 stops6h 15m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$174
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Fri 12/25
6:20 am-11:58 am
1 stop4h 38m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$199
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Thu 10/22
7:30 am-2:35 pm
1 stop6h 05m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$219
St. LouisBoston
STL Lambert-St Louis - BOS Boston Logan Intl
STLBOS
Lambert-St Louis
Wed 12/23
6:04 am-12:10 pm
1 stop5h 06m
Boston Logan Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$219
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Boston
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Boston in September.
| 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 Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Boston flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Boston flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Boston flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Boston flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Boston flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Boston
Have a flexible travel schedule? Discover the best time to fly to Boston from St. Louis with our price prediction graph.
STL-BOS
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
Prices
Airlines
How far ahead should I book a flight from St. Louis to Boston?
The best time to book flights from St. Louis to Boston is 77 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, September is the cheapest month in which you can book a flight from St. Louis to Boston (average of $442). Flying from St. Louis to Boston in February is currently the most expensive (average of $721). 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 September 28, 2026.
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 42% 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 September 26, 2026.
Travelers seeking maximum savings on their St. Louis to Boston flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for St. Louis to Boston 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 St. Louis to Boston trip
Our travel experts
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 September 28, 2026.
Read reviews from past customers who have flown Southwest,United Airlines, andJetBlue 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.
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Boarding
8.1
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
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.
Traveling to a place near Boston?
Book flights to Boston if you plan to visit one of these locationsWaltham
Randolph
Concord
Cambridge
Brockton
Dedham
Cranston
Revere
Warwick
Pawtucket
Peabody
Auburn
Londonderry
York Beach
Fitchburg
North Falmouth
Swansea
Chelsea
Braintree
Sandwich
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Explore flights to Boston departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 28, 2026.
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St. Louis and Boston flights
Browse other St. Louis and Boston flight options. Last updated on September 28, 2026.
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Top 5 airlines flying from St. Louis to Boston
Discover the top 5 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 7,457,451 searches. Data last updated September 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$155 | Average$274 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$264 | Average$574 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$305 | Average$481 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$316 | Average$438 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$336 | Average$513 | FlexibilityNo cancel fee | On-time63% |