$163+ Cheap flights from Islip, NY (ISP) 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
Sep 16 — Sep 231
Round-trip
1 adult, Economy
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Find cheap flights from Islip to New Hampshire with Cheapflights
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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 Islip to New HampshireExplore the most affordable flight options available from Islip to New Hampshire. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 17, 2026.
Explore the most affordable flight options available from Islip to New Hampshire. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 17, 2026.
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/193:10 pm -
1 stop4h 05m
Tue 10/206:30 pm -
1 stop4h 05m
Deal found 8/13![Southwest logo]()
$234
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:05 am -
2 stops10h 40m
Thu 10/295:10 pm -
1 stop6h 25m
Deal found 8/13![Southwest logo]()
$240
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/93:20 pm -
1 stop6h 10m
Wed 9/165:25 am -
1 stop4h 50m
Deal found 8/12![Southwest logo]()
$246
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:10 am -
1 stop3h 30m
Mon 9/75:40 am -
1 stop4h 00m
Deal found 8/13![Southwest logo]()
$258
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/153:20 pm -
1 stop6h 10m
Fri 9/185:50 am -
1 stop3h 50m
Deal found 8/12![Southwest logo]()
$265
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:05 am -
2 stops11h 15m
Fri 10/235:20 am -
1 stop6h 25m
Deal found 8/13![Southwest logo]()
$270
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” 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 9/265:30 am -
1 stop4h 25m
Wed 9/305:25 am -
1 stop4h 50m
Deal found 8/13![Southwest logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/1312:00 pm -
1 stop28h 24m
Wed 10/215:09 pm -
1 stop17h 08m
Deal found 8/16![Breeze Airways logo]()
$298
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/1312:00 pm -
1 stop28h 24m
Tue 10/205:09 pm -
1 stop18h 11m
Deal found 8/16![Breeze Airways logo]()
$314
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:10 am -
1 stop6h 20m
Thu 9/175:50 am -
1 stop3h 50m
Deal found 8/13![Southwest logo]()
$316
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/111:56 am -
2 stops9h 23m
Wed 9/211:07 am -
1 stop22h 46m
Deal found 8/14![Multiple Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/163:02 pm -
1 stop25h 22m
Wed 10/215:09 pm -
1 stop17h 08m
Deal found 8/16![Breeze Airways logo]()
$320
Best flights from Islip to New HampshireDiscover carefully curated flight deals from Islip to New Hampshire that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 17, 2026.
Discover carefully curated flight deals from Islip to New Hampshire that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 17, 2026.
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:10 am -
1 stop3h 30m
Mon 9/75:40 am -
1 stop4h 00m
Deal found 8/13![Southwest logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:57 am -
1 stop23h 48m
Wed 9/29:51 am -
2 stops33h 18m
Deal found 8/14![Breeze Airways logo]()
$350
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/153:20 pm -
1 stop6h 10m
Fri 9/185:50 am -
1 stop3h 50m
Deal found 8/12![Southwest logo]()
$265
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:05 am -
2 stops11h 15m
Fri 10/235:20 am -
1 stop6h 25m
Deal found 8/13![Southwest logo]()
$270
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/96:05 am -
2 stops10h 05m
Wed 9/1610:50 am -
1 stop6h 10m
Deal found 8/12![Southwest logo]()
$321
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 8/282:28 pm -
1 stop25h 48m
Mon 8/316:29 pm -
2 stops16h 47m
Deal found 8/14![Breeze Airways logo]()
$393
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 10/165:40 pm -
1 stop6h 25m
Sun 10/185:35 am -
1 stop4h 45m
Deal found 8/12![Southwest logo]()
$326
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/1112:35 pm -
2 stops9h 20m
Sun 9/135:55 am -
1 stop4h 00m
Deal found 8/12![Southwest logo]()
$332
This Southwest deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” 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 10/23:10 pm -
1 stop4h 05m
Sun 10/45:35 am -
1 stop4h 45m
Deal found 8/15![Southwest logo]()
$357
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/1810:20 am -
1 stop4h 10m
Sun 9/205:55 am -
1 stop4h 00m
Deal found 8/12![Southwest logo]()
$357
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 9/223:20 pm -
1 stop6h 10m
Wed 9/234:55 pm -
1 stop4h 15m
Deal found 8/16![Southwest logo]()
$357
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 12/1112:25 pm -
2 stops9h 35m
Sun 12/135:35 am -
1 stop6h 10m
Deal found 8/17![Southwest logo]()
$362
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” 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 10/305:40 pm -
1 stop3h 40m
Sun 11/17:45 pm -
1 stop3h 45m
Deal found 8/13![Southwest logo]()
$367
This Southwest deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” 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 9/64:15 pm -
1 stop6h 40m
Tue 9/82:45 pm -
1 stop6h 25m
Deal found 8/15![Southwest logo]()
$397
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/612:20 pm -
1 stop4h 15m
Fri 9/113:40 pm -
1 stop6h 30m
Deal found 8/17![Southwest logo]()
$398
This Booking.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/35:50 pm -
3 stops23h 06m
Mon 9/75:36 pm -
3 stops19h 52m
Deal found 8/13![Breeze Airways logo]()
$1,040
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:10 am -
1 stop3h 40m
Fri 9/1112:40 pm -
2 stops9h 30m
Deal found 8/16![Southwest logo]()
$402
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/165:40 pm -
1 stop6h 15m
Mon 10/195:20 am -
1 stop9h 10m
Deal found 8/16![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” 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 10/165:40 pm -
1 stop6h 15m
Sun 10/185:40 am -
1 stop4h 40m
Deal found 8/15![Southwest logo]()
$427
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 10/115:40 am -
1 stop4h 00m
Tue 10/135:40 am -
1 stop10h 05m
Deal found 8/14![Southwest logo]()
$432
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/246:10 am -
1 stop3h 40m
Sat 9/265:40 am -
1 stop6h 25m
Deal found 8/16![Southwest logo]()
$464
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 9/110:55 am -
2 stops11h 10m
Sat 9/510:30 am -
2 stops9h 05m
Deal found 8/14![Southwest logo]()
$465
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 8/295:30 am -
1 stop6h 15m
Thu 9/35:55 am -
1 stop3h 45m
Deal found 8/14![Southwest logo]()
$469
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 8/295:30 am -
2 stops8h 50m
Wed 9/25:35 am -
2 stops9h 20m
Deal found 8/14![Southwest logo]()
$469
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” 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 8/281:15 pm -
2 stops8h 35m
Tue 9/15:35 am -
2 stops9h 20m
Deal found 8/13![Southwest logo]()
$478
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 8/2812:35 pm -
1 stop5h 10m
Sun 8/306:05 am -
1 stop3h 50m
Deal found 8/16![Southwest logo]()
$573
Last-minute flights from Islip to New HampshireDiscover last-minute flight deals from Islip to New Hampshire. Data last updated August 17, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to New Hampshire. Data last updated August 17, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 8/282:28 pm -
1 stop25h 48m
Wed 9/211:07 am -
1 stop31h 07m
Deal found 8/14![Multiple Airlines logo]()
$346
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:57 am -
1 stop23h 48m
Wed 9/29:51 am -
2 stops33h 18m
Deal found 8/14![Breeze Airways logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 8/318:43 pm -
1 stop24h 36m
Sun 9/67:00 am -
2 stops30h 28m
Deal found 8/14![Breeze Airways logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/111:56 am -
2 stops9h 23m
Wed 9/211:07 am -
1 stop22h 46m
Deal found 8/14![Multiple Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:10 am -
1 stop3h 30m
Mon 9/75:40 am -
1 stop4h 00m
Deal found 8/13![Southwest logo]()
$258
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/93:20 pm -
1 stop6h 10m
Wed 9/165:25 am -
1 stop4h 50m
Deal found 8/12![Southwest logo]()
$246
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:10 am -
1 stop6h 20m
Thu 9/175:50 am -
1 stop3h 50m
Deal found 8/13![Southwest logo]()
$316
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/1112:35 pm -
2 stops9h 20m
Sun 9/135:55 am -
1 stop4h 00m
Deal found 8/12![Southwest logo]()
$332
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” 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 9/153:20 pm -
1 stop6h 10m
Fri 9/185:50 am -
1 stop3h 50m
Deal found 8/12![Southwest logo]()
$265
This Priceline deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/154:26 pm -
1 stop6h 52m
Tue 9/222:40 pm -
1 stop8h 42m
Deal found 8/15![JetBlue logo]()
$325
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 9/195:30 am -
1 stop4h 25m
Mon 9/215:50 am -
1 stop3h 50m
Deal found 8/14![Southwest logo]()
$357
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” 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 9/265:30 am -
1 stop4h 25m
Wed 9/305:25 am -
1 stop4h 50m
Deal found 8/13![Southwest logo]()
$296
One-way flights from Islip to New HampshireSearch for one-way flight options from Islip to New Hampshire. Find affordable one-way fares based on user searches. Data last updated August 17, 2026.
Search for one-way flight options from Islip to New Hampshire. Find affordable one-way fares based on user searches. Data last updated August 17, 2026.
This JetBlue deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/234:26 pm -
1 stop6h 52m
Deal found 8/14![JetBlue logo]()
$163
This Southwest deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” 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 9/144:05 pm -
1 stop3h 35m
Deal found 8/14![Southwest logo]()
$179
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 9/1512:55 pm -
2 stops8h 30m
Deal found 8/16![Southwest logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” 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 9/1912:00 pm -
2 stops22h 58m
Deal found 8/15![Multiple Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2511:56 am -
2 stops9h 23m
Deal found 8/16![Breeze Airways logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” 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 10/1510:57 am -
2 stops46h 32m
Deal found 8/15![Multiple Airlines logo]()
$196
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 9/76:10 am -
1 stop3h 40m
Deal found 8/16![Southwest logo]()
$199
This Southwest deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 9/66:50 am -
2 stops8h 25m
Deal found 8/16![Southwest logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/1810:57 am -
2 stops25h 05m
Deal found 8/16![Multiple Airlines logo]()
$229
This Southwest deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” 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 9/206:20 am -
1 stop3h 45m
Deal found 8/15![Southwest logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/312:00 pm -
3 stops23h 44m
Deal found 8/16![Multiple Airlines logo]()
$232
This Booking.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:05 am -
Nonstop1h 25m
Deal found 8/16![Cape Air logo]()
$245
Find flight deals from Islip to New Hampshire
Keep the following information in mind while searching for Islip to New Hampshire flight deals. Data was last updated August 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $234 (Southwest) |
One-way from | $163 (JetBlue) |
Popular in | April |
Cheapest in | November |
Average price | $256 |
Cheapflights Fare Finder
Customize your flight search to find flights from Islip 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 August 17, 2026.
Use the filters below to find and compare flights from Islip to New Hampshire that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
IslipManchester
ISP Islip Long Island - MHT Manchester
ISPMHT
Islip Long Island
Thu 9/3
6:10 am-9:40 am
1 stop3h 30m
Manchester
Mon 9/7
5:40 am-9:40 am
1 stop4h 00m
$258
IslipBoston
ISP Islip Long Island - BOS Boston Logan Intl
ISPBOS
Islip Long Island
Tue 9/15
3:20 pm-9:30 pm
1 stop6h 10m
Boston Logan Intl
Fri 9/18
5:50 am-9:40 am
1 stop3h 50m
$265
IslipPortland
ISP Islip Long Island - PWM Portland
ISPPWM
Islip Long Island
Tue 10/20
6:05 am-5:20 pm
2 stops11h 15m
Portland
Fri 10/23
5:20 am-11:45 am
1 stop6h 25m
$270
IslipBoston
ISP Islip Long Island - BOS Boston Logan Intl
ISPBOS
Islip Long Island
Wed 9/9
6:05 am-4:10 pm
2 stops10h 05m
Boston Logan Intl
Wed 9/16
10:50 am-5:00 pm
1 stop6h 10m
$321
IslipBoston
ISP Islip Long Island - BOS Boston Logan Intl
ISPBOS
Islip Long Island
Fri 10/16
5:40 pm-12:05 am
1 stop6h 25m
Boston Logan Intl
Sun 10/18
5:35 am-10:20 am
1 stop4h 45m
$326
IslipBoston
ISP Islip Long Island - BOS Boston Logan Intl
ISPBOS
Islip Long Island
Fri 9/11
12:35 pm-9:55 pm
2 stops9h 20m
Boston Logan Intl
Sun 9/13
5:55 am-9:55 am
1 stop4h 00m
$332
IslipManchester
ISP Islip Long Island - MHT Manchester
ISPMHT
Islip Long Island
Sat 8/29
11:57 am-11:45 am
1 stop23h 48m
Manchester
Wed 9/2
9:51 am-7:09 pm
2 stops33h 18m
$350
IslipBoston
ISP Islip Long Island - BOS Boston Logan Intl
ISPBOS
Islip Long Island
Fri 10/2
3:10 pm-7:15 pm
1 stop4h 05m
Boston Logan Intl
Sun 10/4
5:35 am-10:20 am
1 stop4h 45m
$357
IslipBoston
ISP Islip Long Island - BOS Boston Logan Intl
ISPBOS
Islip Long Island
Fri 9/18
10:20 am-2:30 pm
1 stop4h 10m
Boston Logan Intl
Sun 9/20
5:55 am-9:55 am
1 stop4h 00m
$357
IslipBoston
ISP Islip Long Island - BOS Boston Logan Intl
ISPBOS
Islip Long Island
Tue 9/22
3:20 pm-9:30 pm
1 stop6h 10m
Boston Logan Intl
Wed 9/23
4:55 pm-9:10 pm
1 stop4h 15m
$357
Showing 1-10 of 43 resultsSorted by cheapest first
Best time to book a flight from Islip to New Hampshire
Have a flexible travel schedule? Discover the best time to fly to New Hampshire from Islip with our price prediction graph.
ISP-BOS
ISP-PWM
ISP-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 Islip to New Hampshire
ISP-USNH
ISP-BOS
ISP-PWM
ISP-MHT
No data available for this route at this time. Please check back soon.
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