$80+ Cheap flights from St. Louis (STL) to New Hampshire
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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MHT
Mar 5 — Mar 121
1 adult, Economy
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Find cheap flights from St. Louis to New Hampshire with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to New Hampshire
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Cheapest flights from St. Louis to New HampshireExplore the most affordable flight options available from St. Louis to New Hampshire. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
Explore the most affordable flight options available from St. Louis to New Hampshire. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/1111:32 am
STL
- BOS
1 stop23h 09m
Multiple Airlines
Mon 3/169:45 am
BOS
- STL
1 stop10h 40m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 4/208:13 pm
STL
- BOS
1 stop14h 52m
Frontier
Thu 4/2312:56 pm
BOS
- STL
2 stops18h 54m
Frontier
Deal found 2/1![Frontier logo]()
$276
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 2/183:49 pm
STL
- BOS
1 stop16h 17m
Multiple Airlines
Thu 2/194:22 pm
BOS
- STL
1 stop8h 37m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/2411:27 am
STL
- BOS
2 stops25h 28m
Multiple Airlines
Sat 3/2812:36 pm
BOS
- STL
1 stop22h 55m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/2312:16 pm
STL
- BOS
1 stop22h 25m
Frontier
Sat 3/2812:36 pm
BOS
- STL
1 stop22h 55m
Frontier
Deal found 2/1![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/153:49 pm
STL
- BOS
1 stop18h 48m
Multiple Airlines
Sun 2/224:22 pm
BOS
- STL
2 stops21h 47m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 4/178:13 pm
STL
- BOS
1 stop27h 38m
Frontier
Sun 4/1912:35 pm
BOS
- STL
1 stop19h 15m
Frontier
Deal found 2/2![Frontier logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/2611:21 am
STL
- BOS
1 stop23h 20m
Multiple Airlines
Sun 3/294:23 pm
BOS
- STL
1 stop15h 39m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$299
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 4/178:13 pm
STL
- BOS
2 stops16h 14m
Multiple Airlines
Sun 4/1912:35 pm
BOS
- STL
1 stop19h 15m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$301
This American Airlines deal was found by Cheapflights users on 2/2. 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 4/76:07 pm
STL
- BOS
Nonstop2h 41m
American Airlines
Sat 4/113:59 pm
BOS
- STL
1 stop8h 47m
American Airlines
Deal found 2/2![American Airlines logo]()
$302
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/77:47 am
STL
- BOS
1 stop6h 59m
Multiple Airlines
Sun 3/812:50 pm
BOS
- STL
1 stop25h 29m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/198:02 am
STL
- BOS
1 stop12h 31m
Multiple Airlines
Mon 3/235:49 pm
BOS
- STL
2 stops17h 43m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$305
Best flights from St. Louis to New HampshireDiscover carefully curated flight deals from St. Louis to New Hampshire that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
Discover carefully curated flight deals from St. Louis to New Hampshire that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/77:47 am
STL
- BOS
1 stop6h 59m
Multiple Airlines
Sun 3/812:50 pm
BOS
- STL
1 stop25h 29m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 4/214:55 pm
STL
- BOS
2 stops30h 56m
Frontier
Sat 4/2512:35 pm
BOS
- STL
1 stop22h 55m
Frontier
Deal found 2/2![Frontier logo]()
$310
This American Airlines deal was found by Cheapflights users on 2/2. 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 4/285:21 pm
STL
- PWM
1 stop5h 52m
American Airlines
Thu 5/75:51 pm
PWM
- STL
1 stop5h 28m
American Airlines
Deal found 2/2![American Airlines logo]()
$317
This United Airlines deal was found by Cheapflights users on 2/1. 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.
Mon 2/168:17 am
STL
- PWM
1 stop5h 57m
United Airlines
Fri 2/207:31 pm
PWM
- STL
1 stop5h 28m
United Airlines
Deal found 2/1![United Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 2/1. 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 3/77:40 pm
STL
- BOS
Nonstop2h 25m
Southwest
Sat 3/145:35 am
BOS
- STL
Nonstop3h 05m
Southwest
Deal found 2/1![Southwest logo]()
$359
This Delta deal was found by Cheapflights users on 2/1. 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.
Mon 2/166:35 am
STL
- PWM
2 stops9h 39m
Delta
Fri 2/206:00 am
PWM
- STL
2 stops11h 45m
Delta
Deal found 2/1![Delta logo]()
$379
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 4/178:13 pm
STL
- BOS
1 stop14h 32m
Multiple Airlines
Mon 4/207:55 pm
BOS
- STL
2 stops35h 55m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$307
This United Airlines deal was found by Cheapflights users on 2/2. 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 5/57:45 am
STL
- PWM
1 stop5h 29m
United Airlines
Fri 5/84:45 pm
PWM
- STL
1 stop5h 23m
United Airlines
Deal found 2/2![United Airlines logo]()
$353
This Southwest deal was found by Cheapflights users on 2/2. 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 2/246:05 am
STL
- BOS
2 stops9h 05m
Southwest
Wed 2/256:25 am
BOS
- STL
Nonstop3h 20m
Southwest
Deal found 2/2![Southwest logo]()
$366
This Southwest deal was found by Cheapflights users on 2/1. 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 3/231:25 pm
STL
- BOS
Nonstop2h 30m
Southwest
Sat 3/285:35 am
BOS
- STL
Nonstop3h 05m
Southwest
Deal found 2/1![Southwest logo]()
$367
This American Airlines deal was found by Cheapflights users on 2/1. 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.
Wed 6/106:03 am
STL
- PWM
1 stop7h 00m
American Airlines
Mon 6/155:04 pm
PWM
- STL
1 stop5h 19m
American Airlines
Deal found 2/1![American Airlines logo]()
$407
This Delta deal was found by Cheapflights users on 2/1. 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.
Mon 6/225:00 pm
STL
- PWM
1 stop5h 59m
Delta
Sun 6/286:50 pm
PWM
- STL
1 stop5h 48m
Delta
Deal found 2/1![Delta logo]()
$407
This United Airlines deal was found by Cheapflights users on 2/2. 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 2/246:25 am
STL
- BOS
2 stops6h 47m
United Airlines
Wed 2/257:45 am
BOS
- STL
1 stop5h 36m
United Airlines
Deal found 2/2![United Airlines logo]()
$376
This American Airlines deal was found by Cheapflights users on 2/1. 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 6/186:03 am
STL
- PWM
1 stop5h 38m
American Airlines
Sun 6/216:00 am
PWM
- STL
1 stop5h 39m
American Airlines
Deal found 2/1![American Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 2/1. 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 4/207:20 am
STL
- BOS
1 stop4h 20m
Southwest
Thu 4/235:40 am
BOS
- STL
Nonstop3h 00m
Southwest
Deal found 2/1![Southwest logo]()
$381
This American Airlines deal was found by Cheapflights users on 2/1. 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 3/126:00 am
STL
- MHT
1 stop4h 21m
American Airlines
Sat 3/145:40 am
MHT
- STL
1 stop8h 04m
American Airlines
Deal found 2/1![American Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 2/2. 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 3/35:55 pm
STL
- BOS
Nonstop2h 30m
Southwest
Sun 3/85:35 am
BOS
- STL
Nonstop3h 05m
Southwest
Deal found 2/2![Southwest logo]()
$396
This United Airlines deal was found by Cheapflights users on 2/1. 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 4/710:00 am
STL
- MHT
2 stops7h 56m
United Airlines
Tue 4/142:30 pm
MHT
- STL
2 stops10h 27m
United Airlines
Deal found 2/1![United Airlines logo]()
$437
This American Airlines deal was found by Cheapflights users on 2/1. 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 3/23:49 pm
STL
- MHT
1 stop7h 10m
American Airlines
Mon 3/94:00 pm
MHT
- STL
1 stop6h 21m
American Airlines
Deal found 2/1![American Airlines logo]()
$414
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:40 am
STL
- MHT
1 stop4h 10m
Southwest
Mon 8/36:45 am
MHT
- STL
1 stop6h 25m
Southwest
Deal found 2/1![Southwest logo]()
$397
This Southwest deal was found by Cheapflights users on 2/1. 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 3/246:45 pm
STL
- BOS
Nonstop2h 25m
Southwest
Sat 3/285:35 am
BOS
- STL
Nonstop3h 05m
Southwest
Deal found 2/1![Southwest logo]()
$400
This Southwest deal was found by Cheapflights users on 2/1. 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 3/212:05 pm
STL
- MHT
2 stops9h 35m
Southwest
Mon 3/91:05 pm
MHT
- STL
1 stop5h 45m
Southwest
Deal found 2/1![Southwest logo]()
$422
This Southwest deal was found by Cheapflights users on 2/1. 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 3/22:55 pm
STL
- MHT
2 stops6h 45m
Southwest
Fri 3/65:35 am
MHT
- STL
1 stop6h 15m
Southwest
Deal found 2/1![Southwest logo]()
$422
This Southwest deal was found by Cheapflights users on 2/1. 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 4/301:45 pm
STL
- MHT
1 stop7h 10m
Southwest
Mon 5/43:15 pm
MHT
- STL
2 stops8h 40m
Southwest
Deal found 2/1![Southwest logo]()
$441
Last-minute flights from St. Louis to New HampshireDiscover last-minute flight deals from St. Louis to New Hampshire. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to New Hampshire. Data last updated February 3, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/153:49 pm
STL
- BOS
1 stop18h 48m
Multiple Airlines
Sun 2/224:22 pm
BOS
- STL
2 stops21h 47m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 2/183:49 pm
STL
- BOS
1 stop16h 17m
Multiple Airlines
Thu 2/194:22 pm
BOS
- STL
1 stop8h 37m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$277
This American Airlines deal was found by Cheapflights users on 2/1. 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 2/2811:50 am
STL
- BOS
Nonstop2h 40m
American Airlines
Wed 3/43:03 pm
BOS
- STL
Nonstop3h 16m
American Airlines
Deal found 2/1![American Airlines logo]()
$313
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/13:49 pm
STL
- BOS
1 stop29h 12m
Multiple Airlines
Sun 3/812:50 pm
BOS
- STL
1 stop25h 29m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/53:49 pm
STL
- BOS
1 stop18h 59m
Multiple Airlines
Mon 3/96:10 pm
BOS
- STL
2 stops30h 09m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/61:09 pm
STL
- BOS
1 stop21h 32m
Frontier
Sun 3/1512:35 pm
BOS
- STL
1 stop25h 59m
Frontier
Deal found 2/2![Frontier logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/77:47 am
STL
- BOS
1 stop6h 59m
Multiple Airlines
Sun 3/812:50 pm
BOS
- STL
1 stop25h 29m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/1111:32 am
STL
- BOS
1 stop23h 09m
Multiple Airlines
Mon 3/169:45 am
BOS
- STL
1 stop10h 40m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/198:02 am
STL
- BOS
1 stop12h 31m
Multiple Airlines
Mon 3/235:49 pm
BOS
- STL
2 stops17h 43m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$305
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/2312:16 pm
STL
- BOS
1 stop22h 25m
Frontier
Sat 3/2812:36 pm
BOS
- STL
1 stop22h 55m
Frontier
Deal found 2/1![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/2411:27 am
STL
- BOS
2 stops25h 28m
Multiple Airlines
Sat 3/2812:36 pm
BOS
- STL
1 stop22h 55m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/2611:21 am
STL
- BOS
1 stop23h 20m
Multiple Airlines
Sun 3/294:23 pm
BOS
- STL
1 stop15h 39m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$299
One-way flights from St. Louis to New HampshireSearch for one-way flight options from St. Louis to New Hampshire. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
Search for one-way flight options from St. Louis to New Hampshire. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/258:17 pm
STL
- BOS
1 stop27h 56m
Frontier
Deal found 2/2![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/28:22 pm
STL
- BOS
2 stops19h 23m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/33:49 pm
STL
- BOS
1 stop18h 59m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 1/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:22 pm
STL
- BOS
1 stop27h 51m
Frontier
Deal found 1/31![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/98:22 pm
STL
- BOS
1 stop27h 51m
Frontier
Deal found 2/2![Frontier logo]()
$91
This Expedia deal was found by Cheapflights users on 1/31. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:21 am
STL
- BOS
1 stop12h 30m
Frontier
Deal found 1/31![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/3111:27 am
STL
- BOS
2 stops25h 28m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/3111:27 am
STL
- BOS
1 stop12h 46m
Frontier
Deal found 2/2![Frontier logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/243:49 pm
STL
- BOS
2 stops30h 55m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/48:17 pm
STL
- BOS
2 stops26h 27m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/33:49 pm
STL
- PWM
1 stop17h 28m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$164
This Delta deal was found by Cheapflights users on 2/1. 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.
Sun 3/15:39 pm
STL
- PWM
1 stop4h 41m
Delta
Deal found 2/1![Delta logo]()
$170
Find flight deals from St. Louis to New Hampshire
Keep the following information in mind while searching for St. Louis to New Hampshire flight deals. Data was last updated February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $271 (Kiwi.com) |
One-way from | $80 (Kiwi.com) |
Popular in | January |
Cheapest in | September |
Average price | $447 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to New Hampshire 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 February 3, 2026.
Use the filters below to find and compare flights from St. Louis to New Hampshire that are best for you.
Fly from
St. Louis
Fly to
New Hampshire
Route
Depart
Return
Price
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Sat 3/7
7:47 am-3:46 pm
1 stop6h 59m
Boston Logan Intl
Sun 3/8
12:50 pm-1:19 pm
1 stop25h 29m
$304
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Fri 4/17
8:13 pm-11:45 am
1 stop14h 32m
Boston Logan Intl
Mon 4/20
7:55 pm-6:50 am
2 stops35h 55m
$307
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Tue 4/21
4:55 pm-12:51 am
2 stops30h 56m
Boston Logan Intl
Sat 4/25
12:35 pm-10:30 am
1 stop22h 55m
$310
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Tue 4/28
5:21 pm-12:13 am
1 stop5h 52m
Portland
Thu 5/7
5:51 pm-10:19 pm
1 stop5h 28m
$317
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Mon 2/16
8:17 am-3:14 pm
1 stop5h 57m
Portland
Fri 2/20
7:31 pm-11:59 pm
1 stop5h 28m
$339
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Tue 5/5
7:45 am-2:14 pm
1 stop5h 29m
Portland
Fri 5/8
4:45 pm-9:08 pm
1 stop5h 23m
$353
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Sat 3/7
7:40 pm-11:05 pm
Nonstop2h 25m
Boston Logan Intl
Sat 3/14
5:35 am-7:40 am
Nonstop3h 05m
$359
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Tue 2/24
6:05 am-4:10 pm
2 stops9h 05m
Boston Logan Intl
Wed 2/25
6:25 am-8:45 am
Nonstop3h 20m
$366
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Mon 3/23
1:25 pm-4:55 pm
Nonstop2h 30m
Boston Logan Intl
Sat 3/28
5:35 am-7:40 am
Nonstop3h 05m
$367
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Tue 2/24
6:25 am-2:12 pm
2 stops6h 47m
Boston Logan Intl
Wed 2/25
7:45 am-12:21 pm
1 stop5h 36m
$376
Showing 1-10 of 50 results
Best time to book a flight from St. Louis to New Hampshire
Have a flexible travel schedule? Discover the best time to fly to New Hampshire from St. Louis with our price prediction graph.
STL-BOS
STL-PWM
STL-MHT
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 New Hampshire
STL-USNH
STL-BOS
STL-PWM
STL-MHT
What is the cheapest month to book a flight from St. Louis to New Hampshire?
Currently, September is the cheapest month in which you can book a flight from St. Louis to New Hampshire (average of $175). Flying from St. Louis to New Hampshire in December is currently the most expensive (average of $495). 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.
Reviews of airlines servicing New Hampshire
Get insights into the airlines that provide service to New Hampshire. 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 New Hampshire. Reviews last updated February 3, 2026.
Get a feel of what it's like to fly with Southwest and American Airlines from St. Louis to New Hampshire by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from St. Louis to New Hampshire. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for St. Louis to New Hampshire
See prices for flight routes from nearby airports that may be better suited for you.
Top 2 airlines flying from St. Louis to New Hampshire
Discover the top 2 airlines that operate flights from St. Louis to New Hampshire. 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 February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$200 | Average$365 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$256 | Average$364 | FlexibilityNo cancel fee | On-time71% |