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New Hampshire

$154+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
giu 20 — giu 271
sab 6/20
sab 6/27
1 adult, Economy
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Cheap flight deals from Islip to New Hampshire

Cheapest flights from Islip to New Hampshire
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 maggio 21, 2026.

This Southwest deal was found by Cheapflights users on 5/17. 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.
lun 8/176:10 am
ISP
-
PWM
1 stop3h 40m
Southwest
lun 8/245:55 am
PWM
-
ISP
1 stop6h 40m
Southwest
Deal found 5/17$327
This Southwest deal was found by Cheapflights users on 5/16. 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.
mar 7/76:00 am
ISP
-
PWM
1 stop6h 25m
Southwest
sab 7/115:35 am
PWM
-
ISP
1 stop9h 15m
Southwest
Deal found 5/16$332
This Southwest deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” 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.
gio 7/165:50 pm
ISP
-
BOS
1 stop6h 15m
Southwest
sab 7/186:45 pm
BOS
-
ISP
1 stop4h 25m
Southwest
Deal found 5/19$347
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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.
dom 11/112:25 pm
ISP
-
MHT
1 stop5h 30m
Southwest
mar 11/312:45 pm
MHT
-
ISP
1 stop3h 35m
Southwest
Deal found 5/18$347
This Southwest deal was found by Cheapflights users on 5/17. 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.
mer 7/298:55 am
ISP
-
BOS
1 stop4h 50m
Southwest
mer 8/1210:05 am
BOS
-
ISP
2 stops11h 00m
Southwest
Deal found 5/17$352
This Southwest deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” 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.
ven 6/1912:30 pm
ISP
-
BOS
1 stop4h 40m
Southwest
ven 6/267:50 pm
BOS
-
ISP
1 stop3h 45m
Southwest
Deal found 5/20$357
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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.
gio 6/186:00 am
ISP
-
BOS
1 stop3h 50m
Southwest
dom 6/212:30 pm
BOS
-
ISP
1 stop9h 05m
Southwest
Deal found 5/18$362
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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.
mer 6/176:00 am
ISP
-
PWM
1 stop3h 55m
Southwest
gio 6/185:20 pm
PWM
-
ISP
1 stop6h 15m
Southwest
Deal found 5/18$367
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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.
mar 6/164:40 pm
ISP
-
BOS
1 stop6h 40m
Southwest
lun 6/227:50 pm
BOS
-
ISP
1 stop3h 45m
Southwest
Deal found 5/18$367
This Southwest deal was found by Cheapflights users on 5/16. 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.
mar 8/43:20 pm
ISP
-
PWM
1 stop5h 50m
Southwest
sab 8/85:40 am
PWM
-
ISP
1 stop6h 25m
Southwest
Deal found 5/16$368
This Kiwi.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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.
mar 6/25:27 pm
ISP
-
PWM
1 stop22h 49m
Multiple Airlines
sab 6/65:01 pm
PWM
-
ISP
2 stops17h 04m
Multiple Airlines
Deal found 5/18$372
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” 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.
mar 6/164:40 pm
ISP
-
BOS
1 stop6h 40m
Southwest
mer 6/171:25 pm
BOS
-
ISP
2 stops9h 10m
Southwest
Deal found 5/18$372

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 maggio 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$327
(Southwest)

One-way from

$154
(Southwest)

Popular in

April

Cheapest in

November

Average price

$237
Provider with most accurate pricing for New York (NYC)-Boston Logan Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Boston Logan Intl flights.
Search Deals
From Islip Long Island to New Hampshire
Search Deals
One-way flight from Islip Long Island to New Hampshire
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 maggio 21, 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

Price

Cheapest round-trip

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

lun 8/17

6:10 am-9:50 am

1 stop3h 40m

Portland

lun 8/24

5:55 am-12:35 pm

1 stop6h 40m

$327

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

mar 6/16

12:25 pm-5:40 pm

1 stop5h 15m

Manchester

mar 6/23

11:25 am-4:00 pm

1 stop4h 35m

$347

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

mer 7/29

8:55 am-1:45 pm

1 stop4h 50m

Boston Logan Intl

mer 8/12

10:05 am-9:05 pm

2 stops11h 00m

$352

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

dom 11/1

5:35 am-3:35 pm

2 stops10h 00m

Manchester

mar 11/3

12:45 pm-4:20 pm

1 stop3h 35m

$352

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

ven 6/19

12:30 pm-5:10 pm

1 stop4h 40m

Boston Logan Intl

ven 6/26

7:50 pm-11:35 pm

1 stop3h 45m

$357

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

mar 6/16

4:40 pm-11:20 pm

1 stop6h 40m

Boston Logan Intl

lun 6/22

7:50 pm-11:35 pm

1 stop3h 45m

$367

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

mer 6/17

6:00 am-9:55 am

1 stop3h 55m

Portland

gio 6/18

5:20 pm-11:35 pm

1 stop6h 15m

$367

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

mar 6/16

4:40 pm-11:20 pm

1 stop6h 40m

Boston Logan Intl

mer 6/17

1:25 pm-10:35 pm

2 stops9h 10m

$372

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

mer 6/17

6:00 am-12:10 pm

1 stop6h 10m

Boston Logan Intl

mer 6/24

8:55 am-4:00 pm

1 stop7h 05m

$372

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

gio 6/18

6:00 am-9:50 am

1 stop3h 50m

Boston Logan Intl

gio 6/18

10:15 pm-8:20 am

1 stop10h 05m

$372

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/18

Showing 1-10 of 43 resultsSorted by cheapest first
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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.
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
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Islip to New Hampshire. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to New Hampshire?

    Most people fly from Islip Long Island (ISP) if they book a flight from Islip to New Hampshire. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.

  • How long is the flight from Islip, New York to New Hampshire?

    Southwest can get you from Islip, New York to New Hampshire in just under 3h 40m. Your travel time can differ by up to . Islip, New York and New Hampshire are separated by a distance of 243 mi.

  • What are the most popular routes from Islip, New York to New Hampshire?

    Most travelers choose Islip Long Island - Boston Logan Intl, Islip Long Island - Portland or Islip Long Island - Manchester when deciding on the best route from Islip, New York to New Hampshire.

  • Can I find deals for flights from Islip to New Hampshire that include hotel bookings?

    Yes. In addition to deals on Islip to New Hampshire flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to New Hampshire?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to New Hampshire.

  • Can I find deals for business class flights from Islip to New Hampshire?

    Yes. Cheapflights offers flight deals from Islip to New Hampshire by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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