$125+ Cheap flights from St. Louis to Boston (STL - BOS)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOS
6月 30 — 7月 71
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
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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 August, booked 79 days in advance, depart on a Friday or Wednesday 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 5月 31, 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 5月 31, 2026.
This Frontier deal was found by Cheapflights users on 5/30. 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.
木 9/248:34 pm
STL
- BOS
1 stop12h 35m
Frontier
月 9/2811:05 am
BOS
- STL
1 stop9h 34m
Frontier
Deal found 5/30![Frontier logo]()
$334
This American Airlines deal was found by Cheapflights users on 5/28. 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.
火 9/18:00 pm
STL
- BOS
Nonstop2h 44m
American Airlines
月 9/77:09 am
BOS
- STL
Nonstop3h 04m
American Airlines
Deal found 5/28![American Airlines logo]()
$335
This American Airlines deal was found by Cheapflights users on 5/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
水 7/89:39 am
STL
- BOS
Nonstop2h 45m
American Airlines
火 7/145:12 pm
BOS
- STL
Nonstop3h 09m
American Airlines
Deal found 5/30![American Airlines logo]()
$337
This Frontier deal was found by Cheapflights users on 5/30. 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.
木 10/18:34 pm
STL
- BOS
1 stop12h 35m
Frontier
月 10/511:05 am
BOS
- STL
1 stop9h 34m
Frontier
Deal found 5/30![Frontier logo]()
$340
This American Airlines deal was found by Cheapflights users on 5/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
土 8/155:00 am
STL
- BOS
1 stop9h 24m
American Airlines
火 8/185:22 pm
BOS
- STL
Nonstop3h 08m
American Airlines
Deal found 5/30![American Airlines logo]()
$341
This Southwest deal was found by Cheapflights users on 5/26. 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.
金 5/297:35 am
STL
- BOS
1 stop6h 35m
Southwest
土 5/3011:50 am
BOS
- STL
Nonstop2h 55m
Southwest
Deal found 5/26![Southwest logo]()
$342
This Delta deal was found by Cheapflights users on 5/27. 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.
火 10/276:45 am
STL
- BOS
1 stop4h 16m
Delta
月 11/22:00 pm
BOS
- STL
1 stop7h 51m
Delta
Deal found 5/27![Delta logo]()
$343
This Southwest deal was found by Cheapflights users on 5/26. 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.
金 7/317:55 pm
STL
- BOS
Nonstop2h 35m
Southwest
火 8/41:05 pm
BOS
- STL
Nonstop2h 50m
Southwest
Deal found 5/26![Southwest logo]()
$344
This Southwest deal was found by Cheapflights users on 5/28. 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.
土 10/36:30 am
STL
- BOS
1 stop4h 25m
Southwest
火 10/65:25 am
BOS
- STL
Nonstop3h 00m
Southwest
Deal found 5/28![Southwest logo]()
$345
This American Airlines deal was found by Cheapflights users on 5/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
火 6/305:08 am
STL
- BOS
1 stop5h 08m
American Airlines
火 7/75:12 pm
BOS
- STL
Nonstop3h 09m
American Airlines
Deal found 5/30![American Airlines logo]()
$347
This Southwest deal was found by Cheapflights users on 5/27. 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.
水 8/52:50 pm
STL
- BOS
2 stops8h 15m
Southwest
月 8/105:00 am
BOS
- STL
Nonstop2h 50m
Southwest
Deal found 5/27![Southwest logo]()
$349
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 5月 31, 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 5月 31, 2026.
This Southwest deal was found by Cheapflights users on 5/26. 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.
土 7/44:45 pm
STL
- BOS
Nonstop2h 35m
Southwest
水 7/85:50 am
BOS
- STL
Nonstop2h 55m
Southwest
Deal found 5/26![Southwest logo]()
$344
This United Airlines deal was found by Cheapflights users on 5/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
土 9/126:53 pm
STL
- BOS
1 stop5h 21m
United Airlines
日 9/277:10 am
BOS
- STL
1 stop6h 03m
United Airlines
Deal found 5/30![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 5/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
土 7/116:09 pm
STL
- BOS
1 stop4h 50m
Delta
水 7/1511:00 am
BOS
- STL
1 stop5h 43m
Delta
Deal found 5/30![Delta logo]()
$404
This Southwest deal was found by Cheapflights users on 5/26. 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.
月 8/246:55 pm
STL
- BOS
Nonstop2h 35m
Southwest
月 8/311:10 pm
BOS
- STL
Nonstop2h 50m
Southwest
Deal found 5/26![Southwest logo]()
$353
This Southwest deal was found by Cheapflights users on 5/31. 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.
水 7/225:25 am
STL
- BOS
2 stops8h 35m
Southwest
火 7/2811:35 am
BOS
- STL
2 stops7h 50m
Southwest
Deal found 5/31![Southwest logo]()
$367
This Southwest deal was found by Cheapflights users on 5/31. 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.
火 7/215:25 am
STL
- BOS
2 stops8h 35m
Southwest
火 7/2811:35 am
BOS
- STL
2 stops7h 50m
Southwest
Deal found 5/31![Southwest logo]()
$367
This Southwest deal was found by Cheapflights users on 5/27. 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.
月 9/212:45 pm
STL
- BOS
2 stops6h 25m
Southwest
木 9/245:00 am
BOS
- STL
Nonstop2h 50m
Southwest
Deal found 5/27![Southwest logo]()
$368
This Southwest deal was found by Cheapflights users on 5/28. 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.
土 7/118:45 pm
STL
- BOS
Nonstop2h 35m
Southwest
火 7/145:50 am
BOS
- STL
Nonstop2h 55m
Southwest
Deal found 5/28![Southwest logo]()
$374
This Southwest deal was found by Cheapflights users on 5/26. 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.
木 11/125:15 am
STL
- BOS
2 stops8h 15m
Southwest
月 11/165:30 pm
BOS
- STL
1 stop5h 35m
Southwest
Deal found 5/26![Southwest logo]()
$378
This Southwest deal was found by Cheapflights users on 5/28. 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.
日 10/48:00 pm
STL
- BOS
Nonstop2h 35m
Southwest
火 10/65:25 am
BOS
- STL
Nonstop3h 00m
Southwest
Deal found 5/28![Southwest logo]()
$389
This Southwest deal was found by Cheapflights users on 5/29. 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.
火 8/46:40 pm
STL
- BOS
Nonstop2h 35m
Southwest
土 8/85:30 am
BOS
- STL
Nonstop2h 50m
Southwest
Deal found 5/29![Southwest logo]()
$399
Last-minute flights from St. Louis to BostonDiscover last-minute flight deals from St. Louis to Boston. Data last updated 5月 31, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Boston. Data last updated 5月 31, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 5/26. 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.
金 5/297:35 am
STL
- BOS
1 stop6h 35m
Southwest
土 5/3011:50 am
BOS
- STL
Nonstop2h 55m
Southwest
Deal found 5/26![Southwest logo]()
$342
This Southwest deal was found by Cheapflights users on 5/27. 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.
金 5/292:30 pm
STL
- BOS
Nonstop2h 35m
Southwest
日 5/315:40 am
BOS
- STL
Nonstop3h 00m
Southwest
Deal found 5/27![Southwest logo]()
$361
This Delta deal was found by Cheapflights users on 5/27. 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.
火 6/210:49 am
STL
- BOS
1 stop6h 06m
Delta
金 6/54:00 pm
BOS
- STL
1 stop5h 39m
Delta
Deal found 5/27![Delta logo]()
$352
This Southwest deal was found by Cheapflights users on 5/27. 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.
水 6/103:10 pm
STL
- BOS
1 stop7h 20m
Southwest
土 6/135:10 am
BOS
- STL
2 stops13h 45m
Southwest
Deal found 5/27![Southwest logo]()
$353
This Frontier deal was found by Cheapflights users on 5/27. 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.
木 6/116:31 pm
STL
- BOS
1 stop12h 21m
Frontier
日 6/146:00 am
BOS
- STL
1 stop12h 30m
Frontier
Deal found 5/27![Frontier logo]()
$340
This American Airlines deal was found by Cheapflights users on 5/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
火 6/231:42 pm
STL
- BOS
1 stop8h 07m
American Airlines
火 6/307:00 am
BOS
- STL
Nonstop3h 09m
American Airlines
Deal found 5/30![American Airlines logo]()
$334
This American Airlines deal was found by Cheapflights users on 5/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
火 6/231:42 pm
STL
- BOS
1 stop8h 07m
American Airlines
水 7/156:01 am
BOS
- STL
1 stop5h 34m
American Airlines
Deal found 5/30![American Airlines logo]()
$344
This Kiwi.com deal was found by Cheapflights users on 5/30. 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.
火 6/236:31 pm
STL
- BOS
2 stops15h 34m
Frontier
火 6/306:00 am
BOS
- STL
1 stop12h 30m
Frontier
Deal found 5/30![Frontier logo]()
$354
This Southwest deal was found by Cheapflights users on 5/26. 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.
水 6/243:10 pm
STL
- BOS
1 stop7h 20m
Southwest
水 7/111:35 am
BOS
- STL
2 stops7h 50m
Southwest
Deal found 5/26![Southwest logo]()
$364
This Southwest deal was found by Cheapflights users on 5/26. 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.
水 6/243:10 pm
STL
- BOS
1 stop7h 20m
Southwest
火 6/3011:35 am
BOS
- STL
2 stops7h 50m
Southwest
Deal found 5/26![Southwest logo]()
$369
This American Airlines deal was found by Cheapflights users on 5/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
火 6/307:51 pm
STL
- BOS
Nonstop2h 45m
American Airlines
火 7/77:00 am
BOS
- STL
Nonstop3h 09m
American Airlines
Deal found 5/30![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 5月 31, 2026.
Search for one-way flight options from St. Louis to Boston. Find affordable one-way fares based on user searches. Data last updated 5月 31, 2026.
This Super.com deal was found by Cheapflights users on 5/26. 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.
木 6/46:33 pm
STL
- BOS
1 stop5h 51m
Frontier
Deal found 5/26![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 5/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
水 8/195:33 pm
STL
- BOS
1 stop6h 54m
Frontier
Deal found 5/26![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 5/30. 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.
土 6/275:06 pm
STL
- BOS
1 stop7h 21m
Frontier
Deal found 5/30![Frontier logo]()
$127
This Super.com deal was found by Cheapflights users on 5/30. 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.
土 7/45:06 pm
STL
- BOS
1 stop7h 21m
Frontier
Deal found 5/30![Frontier logo]()
$128
This Super.com deal was found by Cheapflights users on 5/26. 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.
日 7/126:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 5/26![Frontier logo]()
$131
This Super.com deal was found by Cheapflights users on 5/29. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
月 6/225:06 pm
STL
- BOS
1 stop7h 21m
Frontier
Deal found 5/29![Frontier logo]()
$133
This Super.com deal was found by Cheapflights users on 5/30. 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.
金 7/35:06 pm
STL
- BOS
1 stop7h 21m
Frontier
Deal found 5/30![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 5/30. 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.
日 6/286:31 pm
STL
- BOS
1 stop5h 56m
Frontier
Deal found 5/30![Frontier logo]()
$135
This Super.com deal was found by Cheapflights users on 5/27. 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.
木 7/236:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 5/27![Frontier logo]()
$138
This Super.com deal was found by Cheapflights users on 5/29. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
木 7/96:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Deal found 5/29![Frontier logo]()
$139
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 5月 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $334 (Frontier) |
One-way from | $125 (Super.com) |
Popular in | February |
Cheapest in | September |
Average price | $487 |
Good round-trip deal | $444 or less |
Good one-way deal | $236 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 2,558,603 searches. Data last updated 5月 31, 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 - BOS
STLBOS
Lambert-St Louis
土 7/4
4:45 pm-8:20 pm
Nonstop2h 35m
Boston Logan Intl
水 7/8
5:50 am-7:45 am
Nonstop2h 55m
$344
Quickest round-trip
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
月 8/24
6:55 pm-10:30 pm
Nonstop2h 35m
Boston Logan Intl
月 8/31
1:10 pm-3:00 pm
Nonstop2h 50m
$353
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
水 7/22
5:25 am-3:00 pm
2 stops8h 35m
Boston Logan Intl
火 7/28
11:35 am-6:25 pm
2 stops7h 50m
$367
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
火 7/21
5:25 am-3:00 pm
2 stops8h 35m
Boston Logan Intl
火 7/28
11:35 am-6:25 pm
2 stops7h 50m
$367
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
月 9/21
2:45 pm-10:10 pm
2 stops6h 25m
Boston Logan Intl
木 9/24
5:00 am-6:50 am
Nonstop2h 50m
$368
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
土 7/11
8:45 pm-12:20 am
Nonstop2h 35m
Boston Logan Intl
火 7/14
5:50 am-7:45 am
Nonstop2h 55m
$374
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
木 11/12
5:15 am-2:30 pm
2 stops8h 15m
Boston Logan Intl
月 11/16
5:30 pm-10:05 pm
1 stop5h 35m
$378
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
土 9/12
6:53 pm-1:14 am
1 stop5h 21m
Boston Logan Intl
日 9/27
7:10 am-12:13 pm
1 stop6h 03m
$389
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
日 10/4
8:00 pm-11:35 pm
Nonstop2h 35m
Boston Logan Intl
火 10/6
5:25 am-7:25 am
Nonstop3h 00m
$389
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
火 8/4
6:40 pm-10:15 pm
Nonstop2h 35m
Boston Logan Intl
土 8/8
5:30 am-7:20 am
Nonstop2h 50m
$399
Showing 1-10 of 22 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 May.
| 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 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 78 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 $390). Flying from St. Louis to Boston in February is currently the most expensive (average of $659). 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 5月 31, 2026.
A simple way to save on the total cost of your ticket is to fly from St. Louis to Boston in the evening. If you’re flexible enough to do this you can expect to save up to 51% 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 May 23, 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. Tuesday 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 5月 31, 2026.
Read reviews from past customers who have flown Southwest,Delta, andAmerican Airlines from St. Louis to Boston. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Spirit Airlines
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
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
Cambridge
Concord
Hampton Beach
Brockton
Watertown
Seekonk
Cranston
Chelsea
Warwick
Peabody
York Beach
Londonderry
Swansea
Old Orchard Beach
Auburn
Lowell
Smithfield
Braintree
Sandwich
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Other flights to Boston
Explore flights to Boston departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 5月 31, 2026.
Complete your trip
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St. Louis and Boston flights
Browse other St. Louis and Boston flight options. Last updated on 5月 31, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on 5月 31, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from St. Louis to Boston
Discover the top 6 airlines that operate flights from St. Louis to Boston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated 5月 31, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$73 | Average$249 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$155 | Average$260 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$345 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$254 | Average$477 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$277 | Average$454 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$305 | Average$496 | FlexibilityNo cancel fee | On-time63% |