$122+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MHT
Aug 30 — Sep 61
Round-trip
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
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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 July 31, 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 July 31, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3010:35 am
STL
- BOS
1 stop24h 05m
Frontier
Sun 11/112:35 pm
BOS
- STL
1 stop22h 05m
Frontier
Deal found 7/29![Frontier logo]()
$316
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:00 am
STL
- BOS
Nonstop2h 35m
Southwest
Mon 8/245:50 pm
BOS
- STL
Nonstop2h 55m
Southwest
Deal found 7/30![Southwest logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 7/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/247:58 pm
STL
- BOS
2 stops14h 49m
Frontier
Mon 8/319:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 7/27![Frontier logo]()
$319
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Wed 9/305:00 am
STL
- BOS
1 stop8h 08m
American Airlines
Tue 10/67:00 am
BOS
- STL
Nonstop3h 14m
American Airlines
Deal found 7/27![American Airlines logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:58 pm
STL
- BOS
2 stops14h 49m
Frontier
Mon 8/249:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 7/30![Frontier logo]()
$321
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:00 pm
STL
- BOS
Nonstop2h 44m
American Airlines
Sun 9/67:09 am
BOS
- STL
Nonstop3h 04m
American Airlines
Deal found 7/29![American Airlines logo]()
$322
This American Airlines deal was found by Cheapflights users on 7/30. 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.
Wed 9/305:00 am
STL
- BOS
1 stop8h 08m
American Airlines
Sat 10/101:33 pm
BOS
- STL
1 stop8h 40m
American Airlines
Deal found 7/30![American Airlines logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:19 pm
STL
- PWM
1 stop14h 49m
Multiple Airlines
Sat 10/36:31 pm
PWM
- STL
2 stops43h 39m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 7/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:35 am
STL
- BOS
2 stops21h 54m
Multiple Airlines
Fri 10/169:15 am
BOS
- STL
1 stop11h 24m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 7/28. 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.
Wed 9/911:01 am
STL
- BOS
1 stop8h 59m
American Airlines
Fri 9/116:20 am
BOS
- STL
Nonstop3h 00m
American Airlines
Deal found 7/28![American Airlines logo]()
$325
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Mon 8/246:00 am
STL
- BOS
1 stop5h 14m
American Airlines
Mon 8/317:09 am
BOS
- STL
Nonstop3h 04m
American Airlines
Deal found 7/27![American Airlines logo]()
$326
This Super.com deal was found by Cheapflights users on 7/29. 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.
Thu 9/35:02 pm
STL
- BOS
1 stop15h 07m
Frontier
Sun 9/69:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 7/29![Frontier logo]()
$328
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 July 31, 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 July 31, 2026.
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Wed 9/27:00 am
STL
- BOS
1 stop4h 47m
United Airlines
Mon 9/77:05 am
BOS
- STL
1 stop5h 57m
United Airlines
Deal found 7/30![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:54 pm
STL
- BOS
1 stop5h 23m
Delta
Wed 9/308:00 am
BOS
- STL
1 stop6h 23m
Delta
Deal found 7/29![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 7/29. 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.
Wed 8/266:30 am
STL
- BOS
1 stop4h 45m
Southwest
Wed 9/210:50 am
BOS
- STL
2 stops8h 05m
Southwest
Deal found 7/29![Southwest logo]()
$342
This American Airlines deal was found by Cheapflights users on 7/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/45:57 pm
STL
- PWM
1 stop4h 50m
American Airlines
Wed 9/95:05 pm
PWM
- STL
1 stop5h 19m
American Airlines
Deal found 7/26![American Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:50 pm
STL
- BOS
2 stops7h 35m
Southwest
Fri 9/251:10 pm
BOS
- STL
Nonstop2h 50m
Southwest
Deal found 7/28![Southwest logo]()
$353
This Delta deal was found by Cheapflights users on 7/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:30 pm
STL
- PWM
1 stop4h 47m
Delta
Mon 9/146:00 am
PWM
- STL
1 stop8h 23m
Delta
Deal found 7/31![Delta logo]()
$385
This Southwest deal was found by Cheapflights users on 7/28. 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.
Mon 8/317:00 pm
STL
- BOS
Nonstop2h 30m
Southwest
Fri 9/2512:40 pm
BOS
- STL
2 stops7h 30m
Southwest
Deal found 7/28![Southwest logo]()
$353
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:00 am
STL
- PWM
1 stop7h 38m
United Airlines
Wed 10/285:50 am
PWM
- STL
2 stops9h 40m
United Airlines
Deal found 7/29![United Airlines logo]()
$434
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:00 am
STL
- PWM
1 stop5h 07m
Delta
Wed 8/262:14 pm
PWM
- STL
1 stop5h 13m
Delta
Deal found 7/28![Delta logo]()
$398
This Southwest deal was found by Cheapflights users on 7/27. 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.
Wed 9/163:45 pm
STL
- PWM
1 stop5h 25m
Southwest
Mon 9/215:55 am
PWM
- STL
1 stop6h 40m
Southwest
Deal found 7/27![Southwest logo]()
$362
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2012:28 pm
STL
- MHT
2 stops10h 31m
United Airlines
Thu 8/272:46 pm
MHT
- STL
1 stop5h 25m
United Airlines
Deal found 7/29![United Airlines logo]()
$434
This Southwest deal was found by Cheapflights users on 7/28. 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.
Sat 9/55:45 am
STL
- BOS
1 stop5h 40m
Southwest
Sat 9/121:00 pm
BOS
- STL
2 stops8h 45m
Southwest
Deal found 7/28![Southwest logo]()
$375
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/178:00 am
STL
- PWM
2 stops10h 24m
United Airlines
Sat 10/245:15 am
PWM
- STL
2 stops7h 59m
United Airlines
Deal found 7/29![United Airlines logo]()
$439
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/77:00 am
STL
- BOS
Nonstop2h 35m
Southwest
Mon 8/108:55 pm
BOS
- STL
1 stop11h 50m
Southwest
Deal found 7/29![Southwest logo]()
$375
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Wed 10/141:29 pm
STL
- PWM
2 stops9h 30m
United Airlines
Sat 10/175:15 am
PWM
- STL
2 stops11h 28m
United Airlines
Deal found 7/30![United Airlines logo]()
$439
This Southwest deal was found by Cheapflights users on 7/31. 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.
Mon 9/147:00 pm
STL
- BOS
Nonstop2h 35m
Southwest
Fri 9/185:00 am
BOS
- STL
Nonstop2h 50m
Southwest
Deal found 7/31![Southwest logo]()
$376
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:25 am
STL
- PWM
2 stops10h 52m
United Airlines
Tue 8/256:00 am
PWM
- STL
2 stops10h 38m
United Airlines
Deal found 7/28![United Airlines logo]()
$439
This Southwest deal was found by Cheapflights users on 7/31. 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.
Thu 10/11:05 pm
STL
- BOS
1 stop7h 00m
Southwest
Thu 10/85:25 am
BOS
- STL
Nonstop3h 00m
Southwest
Deal found 7/31![Southwest logo]()
$379
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:25 am
STL
- MHT
2 stops10h 35m
United Airlines
Wed 8/269:25 am
MHT
- STL
2 stops10h 51m
United Airlines
Deal found 7/29![United Airlines logo]()
$439
This Southwest deal was found by Cheapflights users on 7/31. 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.
Mon 9/143:45 pm
STL
- BOS
1 stop5h 40m
Southwest
Tue 9/1510:05 am
BOS
- STL
2 stops7h 40m
Southwest
Deal found 7/31![Southwest logo]()
$394
This United Airlines deal was found by Cheapflights users on 7/27. 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.
Tue 12/17:04 pm
STL
- PWM
2 stops17h 34m
United Airlines
Sat 12/124:48 pm
PWM
- STL
1 stop5h 25m
United Airlines
Deal found 7/27![United Airlines logo]()
$465
This Southwest deal was found by Cheapflights users on 7/27. 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 10/234:30 pm
STL
- BOS
2 stops6h 35m
Southwest
Tue 10/273:50 pm
BOS
- STL
2 stops7h 10m
Southwest
Deal found 7/27![Southwest logo]()
$400
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/191:00 pm
STL
- MHT
1 stop5h 00m
United Airlines
Fri 8/212:46 pm
MHT
- STL
2 stops9h 52m
United Airlines
Deal found 7/28![United Airlines logo]()
$470
This Southwest deal was found by Cheapflights users on 7/27. 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.
Sun 8/306:40 am
STL
- BOS
1 stop6h 20m
Southwest
Tue 9/12:45 pm
BOS
- STL
2 stops7h 55m
Southwest
Deal found 7/27![Southwest logo]()
$419
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am
STL
- MHT
2 stops12h 00m
United Airlines
Mon 8/312:46 pm
MHT
- STL
2 stops8h 14m
United Airlines
Deal found 7/28![United Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:00 am
STL
- MHT
2 stops10h 01m
United Airlines
Wed 10/289:25 am
MHT
- STL
2 stops8h 26m
United Airlines
Deal found 7/28![United Airlines logo]()
$475
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/112:20 pm
STL
- PWM
2 stops7h 10m
Southwest
Fri 9/185:55 am
PWM
- STL
2 stops9h 10m
Southwest
Deal found 7/30![Southwest logo]()
$450
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/91:00 pm
STL
- MHT
1 stop4h 15m
Southwest
Tue 10/131:50 pm
MHT
- STL
1 stop6h 30m
Southwest
Deal found 7/28![Southwest logo]()
$457
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/118:00 am
STL
- PWM
2 stops10h 24m
United Airlines
Sun 9/135:15 am
PWM
- STL
2 stops7h 47m
United Airlines
Deal found 7/28![United Airlines logo]()
$518
This Southwest deal was found by Cheapflights users on 7/27. 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.
Wed 9/93:45 pm
STL
- PWM
1 stop5h 25m
Southwest
Mon 9/1410:30 am
PWM
- STL
2 stops10h 30m
Southwest
Deal found 7/27![Southwest logo]()
$492
Last-minute flights from St. Louis to New HampshireDiscover last-minute flight deals from St. Louis to New Hampshire. Data last updated July 31, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to New Hampshire. Data last updated July 31, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 7/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/54:09 pm
STL
- BOS
1 stop16h 00m
Frontier
Thu 8/1311:59 am
BOS
- STL
1 stop6h 38m
Frontier
Deal found 7/30![Frontier logo]()
$331
This CheapOair deal was found by Cheapflights users on 7/27. 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 8/124:09 pm
STL
- BOS
1 stop16h 00m
Frontier
Sat 8/1510:04 am
BOS
- STL
1 stop14h 55m
Frontier
Deal found 7/27![Frontier logo]()
$330
This Frontier deal was found by Cheapflights users on 7/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:34 pm
STL
- BOS
1 stop12h 12m
Frontier
Thu 8/209:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 7/31![Frontier logo]()
$320
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:00 am
STL
- BOS
Nonstop2h 35m
Southwest
Mon 8/245:50 pm
BOS
- STL
Nonstop2h 55m
Southwest
Deal found 7/29![Southwest logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:58 pm
STL
- BOS
2 stops14h 49m
Frontier
Mon 8/249:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 7/30![Frontier logo]()
$321
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Fri 8/216:17 pm
STL
- BOS
1 stop16h 30m
Frontier
Sun 8/2310:04 am
BOS
- STL
1 stop7h 07m
Frontier
Deal found 7/30![Frontier logo]()
$329
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/221:05 pm
STL
- PWM
1 stop7h 18m
United Airlines
Sat 8/296:53 pm
PWM
- STL
1 stop5h 45m
United Airlines
Deal found 7/29![United Airlines logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Sun 8/237:58 pm
STL
- BOS
2 stops14h 49m
Frontier
Fri 8/289:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 7/30![Frontier logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 7/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/247:58 pm
STL
- BOS
2 stops14h 49m
Frontier
Mon 8/319:36 am
BOS
- STL
1 stop8h 46m
Frontier
Deal found 7/27![Frontier logo]()
$319
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Mon 8/246:00 am
STL
- BOS
1 stop5h 14m
American Airlines
Mon 8/317:09 am
BOS
- STL
Nonstop3h 04m
American Airlines
Deal found 7/27![American Airlines logo]()
$326
This Southwest deal was found by Cheapflights users on 7/29. 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.
Wed 8/261:20 pm
STL
- BOS
Nonstop2h 35m
Southwest
Wed 9/25:25 am
BOS
- STL
2 stops6h 55m
Southwest
Deal found 7/29![Southwest logo]()
$332
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:00 pm
STL
- BOS
Nonstop2h 44m
American Airlines
Sun 9/67:09 am
BOS
- STL
Nonstop3h 04m
American Airlines
Deal found 7/29![American Airlines logo]()
$322
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 July 31, 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 July 31, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/112:29 pm
STL
- BOS
2 stops19h 22m
Frontier
Deal found 7/28![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1610:35 am
STL
- BOS
2 stops21h 54m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/22:29 pm
STL
- BOS
2 stops18h 00m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/282:29 pm
STL
- BOS
1 stop20h 38m
Frontier
Deal found 7/29![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Mon 8/317:58 pm
STL
- BOS
2 stops14h 49m
Frontier
Deal found 7/30![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Fri 9/185:19 pm
STL
- BOS
1 stop16h 32m
Frontier
Deal found 7/30![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/810:35 am
STL
- BOS
2 stops45h 54m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 7/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:35 am
STL
- BOS
1 stop24h 05m
Frontier
Deal found 7/27![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2510:35 am
STL
- BOS
1 stop23h 17m
Frontier
Deal found 7/29![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Mon 10/268:10 pm
STL
- BOS
2 stops14h 30m
Frontier
Deal found 7/30![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/282:29 pm
STL
- PWM
2 stops41h 39m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/46:17 pm
STL
- PWM
2 stops22h 41m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$149
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 July 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $316 (Kiwi.com) |
One-way from | $122 (Kiwi.com) |
Popular in | February |
Cheapest in | September |
Average price | $493 |
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 July 31, 2026.
Use the filters below to find and compare flights from St. Louis to New Hampshire that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Wed 9/2
7:00 am-12:47 pm
1 stop4h 47m
Boston Logan Intl
Mon 9/7
7:05 am-12:02 pm
1 stop5h 57m
$337
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Mon 9/21
6:54 pm-1:17 am
1 stop5h 23m
Boston Logan Intl
Wed 9/30
8:00 am-1:23 pm
1 stop6h 23m
$337
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Wed 8/26
6:30 am-12:15 pm
1 stop4h 45m
Boston Logan Intl
Wed 9/2
10:50 am-5:55 pm
2 stops8h 05m
$342
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Tue 9/1
12:50 pm-9:25 pm
2 stops7h 35m
Boston Logan Intl
Fri 9/25
1:10 pm-3:00 pm
Nonstop2h 50m
$353
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Mon 8/31
7:00 pm-10:30 pm
Nonstop2h 30m
Boston Logan Intl
Fri 9/25
12:40 pm-7:10 pm
2 stops7h 30m
$353
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 9/16
3:45 pm-10:10 pm
1 stop5h 25m
Portland
Mon 9/21
5:55 am-11:35 am
1 stop6h 40m
$362
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Sat 9/5
5:45 am-12:25 pm
1 stop5h 40m
Boston Logan Intl
Sat 9/12
1:00 pm-8:45 pm
2 stops8h 45m
$375
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Fri 8/7
7:00 am-10:35 am
Nonstop2h 35m
Boston Logan Intl
Mon 8/10
8:55 pm-7:45 am
1 stop11h 50m
$375
Quickest round-trip
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Mon 9/14
7:00 pm-10:35 pm
Nonstop2h 35m
Boston Logan Intl
Fri 9/18
5:00 am-6:50 am
Nonstop2h 50m
$376
St. LouisBoston
STL - BOS
STLBOS
Lambert-St Louis
Thu 10/1
1:05 pm-9:05 pm
1 stop7h 00m
Boston Logan Intl
Thu 10/8
5:25 am-7:25 am
Nonstop3h 00m
$379
Showing 1-10 of 60 resultsSorted by cheapest first
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, May is the cheapest month in which you can book a flight from St. Louis to New Hampshire (average of $318). Flying from St. Louis to New Hampshire in February is currently the most expensive (average of $1,046). 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.
How much does it cost to fly round-trip from St. Louis to New Hampshire?
Airfare is typical for this route at the moment.
St. Louis to New Hampshire flights typically cost between $240 and $422 in August.The cheapest round-trip price found within the last 5 days was $339 on American Airlines (Aug 20-Aug 27).
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 July 31, 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.
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Related info for your journey
Find useful and relevant information for your journey from 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.
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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.
Complete your trip
Complete your trip to New Hampshire by adding a car rental and/or hotel reservation to your travel itinerary.
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Find flights from St. Louis to New Hampshire, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and New Hampshire flights
Browse other St. Louis and New Hampshire flight options. Last updated on July 31, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
St. Louis to New Hampshire flights
Consider these flights traveling from St. Louis to New Hampshire.
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 July 31, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$214 | Average$391 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$425 | FlexibilityNo cancel fee | On-time63% |