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New Hampshire

$83+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
May 21 — May 281
Thu 5/21
Thu 5/28
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 April 21, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/111:00 am
ISP
-
BOS
1 stop10h 42m
Multiple Airlines
Wed 6/39:20 am
BOS
-
ISP
1 stop24h 45m
Multiple Airlines
Deal found 4/20$229
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 5/14:07 pm
ISP
-
BOS
2 stops17h 09m
Frontier
Tue 5/510:07 am
BOS
-
ISP
1 stop23h 58m
Frontier
Deal found 4/16$232
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/55:38 pm
ISP
-
BOS
1 stop15h 34m
Frontier
Sat 5/910:07 am
BOS
-
ISP
1 stop24h 20m
Frontier
Deal found 4/20$246
This Southwest deal was found by Cheapflights users on 4/20. 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.
Mon 6/14:30 pm
ISP
-
BOS
1 stop5h 20m
Southwest
Wed 6/32:25 pm
BOS
-
ISP
2 stops7h 45m
Southwest
Deal found 4/20$256
This Kiwi.com deal was found by Cheapflights users on 4/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/44:07 pm
ISP
-
BOS
1 stop17h 05m
Frontier
Fri 5/89:57 am
BOS
-
ISP
1 stop24h 08m
Frontier
Deal found 4/19$291
This Kiwi.com deal was found by Cheapflights users on 4/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/44:07 pm
ISP
-
BOS
2 stops16h 27m
Multiple Airlines
Fri 5/89:57 am
BOS
-
ISP
1 stop24h 08m
Multiple Airlines
Deal found 4/19$298
This Southwest deal was found by Cheapflights users on 4/19. 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.
Thu 5/288:35 am
ISP
-
BOS
1 stop6h 30m
Southwest
Sat 5/307:25 pm
BOS
-
ISP
1 stop3h 55m
Southwest
Deal found 4/19$310
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/112:28 pm
ISP
-
BOS
2 stops18h 44m
Multiple Airlines
Wed 5/139:20 am
BOS
-
ISP
1 stop25h 07m
Multiple Airlines
Deal found 4/17$316
This Southwest deal was found by Cheapflights users on 4/20. 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.
Wed 7/299:00 am
ISP
-
BOS
1 stop4h 45m
Southwest
Thu 7/309:10 am
BOS
-
ISP
1 stop5h 20m
Southwest
Deal found 4/20$347
This Southwest deal was found by Cheapflights users on 4/17. 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.
Thu 6/255:50 pm
ISP
-
MHT
1 stop6h 15m
Southwest
Sun 6/285:45 am
MHT
-
ISP
1 stop6h 00m
Southwest
Deal found 4/17$347
This Southwest deal was found by Cheapflights users on 4/16. 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 5/2812:30 pm
ISP
-
PWM
1 stop3h 45m
Southwest
Fri 5/2912:45 pm
PWM
-
ISP
1 stop3h 45m
Southwest
Deal found 4/16$359
This Southwest deal was found by Cheapflights users on 4/17. 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.
Thu 6/255:50 pm
ISP
-
PWM
1 stop6h 15m
Southwest
Sun 6/285:30 am
PWM
-
ISP
1 stop6h 15m
Southwest
Deal found 4/17$377

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 April 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$229
(Kiwi.com)

One-way from

$83
(Kiwi.com)

Popular in

April

Cheapest in

November

Average price

$319
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. 10% potential increase in price ($28 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 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

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Wed 7/29

9:00 am-3:40 pm

1 stop6h 40m

Boston Logan Intl

Thu 7/30

5:45 am-11:50 am

1 stop6h 05m

$347

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

Thu 6/25

5:50 pm-12:05 am

1 stop6h 15m

Manchester

Sun 6/28

5:45 am-11:45 am

1 stop6h 00m

$347

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Thu 5/28

12:30 pm-4:15 pm

1 stop3h 45m

Portland

Fri 5/29

12:45 pm-4:30 pm

1 stop3h 45m

$359

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 5/1

4:07 pm-9:29 am

1 stop17h 22m

Boston Logan Intl

Tue 5/5

10:07 am-10:05 am

1 stop23h 58m

$376

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Thu 6/25

5:50 pm-12:05 am

1 stop6h 15m

Portland

Sun 6/28

5:30 am-11:45 am

1 stop6h 15m

$377

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 6/26

6:00 am-9:50 am

1 stop3h 50m

Boston Logan Intl

Fri 6/26

7:50 pm-11:35 pm

1 stop3h 45m

$383
Quickest round-trip

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Sun 5/17

6:05 am-9:55 am

1 stop3h 50m

Boston Logan Intl

Sun 5/24

8:55 am-12:25 pm

1 stop3h 30m

$383

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Sat 5/9

6:00 am-12:00 pm

1 stop6h 00m

Boston Logan Intl

Sun 5/10

5:15 pm-11:50 pm

1 stop6h 35m

$387

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 5/22

8:35 am-3:05 pm

1 stop6h 30m

Boston Logan Intl

Fri 5/22

4:45 pm-11:30 pm

1 stop6h 45m

$393

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Sat 5/16

4:40 pm-11:10 pm

1 stop6h 30m

Portland

Sat 5/23

4:35 pm-11:20 pm

1 stop6h 45m

$397

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

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 6h 40m. Your travel time can differ by up to . Islip, New York and New Hampshire are separated by a distance of 153 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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