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New Hampshire

$142+ Cheap flights from Islip (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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
Oct 22 — Oct 291
Wed 10/22
Wed 10/29
1 adult, Economy
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Cheap 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 September 22, 2025.

Round-trip from

$282
(Kiwi.com)

One-way from

$142
(Kiwi.com)

Popular in

April

Cheapest in

October

Average price

$197
From Islip Long Island to New Hampshire
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One-way flight from Islip Long Island to New Hampshire
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Highest demand for flights based on searches. 8% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 22, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/20. 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.
Sat 9/275:05 pmISP - BOS
2 stops16h 53mFrontier
Sat 10/48:56 amBOS - ISP
1 stop24h 08mFrontier
Deal found 9/20$274
This Kiwi.com deal was found by Cheapflights users on 9/21. 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 10/219:37 pmISP - BOS
1 stop15h 43mMultiple Airlines
Tue 10/282:15 pmBOS - ISP
1 stop20h 22mMultiple Airlines
Deal found 9/21$282
This Southwest deal was found by Cheapflights users on 9/21. 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 11/65:30 pmISP - PWM
1 stop6h 50mSouthwest
Sat 11/155:40 amPWM - ISP
1 stop6h 10mSouthwest
Deal found 9/21$291
This Kiwi.com deal was found by Cheapflights users on 9/21. 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 11/78:47 pmISP - MHT
2 stops20h 58mBreeze Airways
Mon 11/109:59 amMHT - ISP
1 stop10h 08mBreeze Airways
Deal found 9/21$294
This Southwest deal was found by Cheapflights users on 9/21. 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 10/216:00 amISP - PWM
1 stop5h 15mSouthwest
Tue 10/285:45 amPWM - ISP
1 stop6h 40mSouthwest
Deal found 9/21$298
This Kiwi.com deal was found by Cheapflights users on 9/19. 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.
Wed 10/158:21 pmISP - BOS
2 stops27h 38mMultiple Airlines
Wed 10/222:15 pmBOS - ISP
1 stop30h 27mMultiple Airlines
Deal found 9/19$306
This Southwest deal was found by Cheapflights users on 9/20. 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.
Fri 10/245:35 pmISP - PWM
1 stop6h 30mSouthwest
Sat 10/255:50 amPWM - ISP
1 stop6h 20mSouthwest
Deal found 9/20$309
This Southwest deal was found by Cheapflights users on 9/21. 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 11/711:05 amISP - BOS
1 stop6h 10mSouthwest
Mon 11/107:55 pmBOS - ISP
1 stop3h 55mSouthwest
Deal found 9/21$327
This Southwest deal was found by Cheapflights users on 9/20. 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.
Fri 10/245:35 pmISP - PWM
1 stop6h 30mSouthwest
Sun 10/265:30 amPWM - ISP
1 stop6h 40mSouthwest
Deal found 9/20$327
This Southwest deal was found by Cheapflights users on 9/21. 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 11/711:05 amISP - MHT
1 stop10h 00mSouthwest
Mon 11/107:40 amMHT - ISP
1 stop5h 10mSouthwest
Deal found 9/21$332
This Kiwi.com deal was found by Cheapflights users on 9/21. 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 10/199:47 pmISP - BOS
1 stop10h 46mFrontier
Sun 10/268:12 amBOS - ISP
2 stops26h 25mFrontier
Deal found 9/21$337
This Southwest deal was found by Cheapflights users on 9/21. 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 12/75:50 amISP - BOS
2 stops11h 50mSouthwest
Sun 12/77:55 pmBOS - ISP
1 stop3h 55mSouthwest
Deal found 9/21$342

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 September 22, 2025.
Use the filters below to find and compare flights from Islip to New Hampshire that are best for you.

Fly from

Islip

Fly to

New Hampshire

Route

Depart

Return

Price

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Tue 10/21

9:37 pm-1:20 pm

1 stop15h 43m

Boston Logan Intl

Tue 10/28

2:15 pm-10:37 am

1 stop20h 22m

$282

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

Fri 11/7

8:47 pm-5:45 pm

2 stops20h 58m

Manchester

Mon 11/10

9:59 am-8:07 pm

1 stop10h 08m

$294

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Tue 10/21

6:00 am-11:15 am

1 stop5h 15m

Portland

Tue 10/28

5:45 am-12:25 pm

1 stop6h 40m

$298

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Wed 10/15

8:21 pm-11:59 pm

2 stops27h 38m

Boston Logan Intl

Wed 10/22

2:15 pm-8:42 pm

1 stop30h 27m

$306

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Fri 10/24

5:35 pm-12:05 am

1 stop6h 30m

Portland

Sat 10/25

5:50 am-12:10 pm

1 stop6h 20m

$309

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Fri 11/7

11:05 am-4:50 pm

1 stop5h 45m

Portland

Sun 11/9

5:25 pm-11:50 pm

1 stop6h 25m

$327

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Sun 12/7

11:05 am-3:45 pm

1 stop4h 40m

Boston Logan Intl

Sun 12/7

7:55 pm-11:50 pm

1 stop3h 55m

$327

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 12/12

5:30 pm-10:55 pm

1 stop5h 25m

Boston Logan Intl

Sun 12/14

7:55 pm-11:50 pm

1 stop3h 55m

$327

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 11/7

11:05 am-5:15 pm

1 stop6h 10m

Boston Logan Intl

Mon 11/10

7:55 pm-11:50 pm

1 stop3h 55m

$327

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Mon 12/1

5:50 pm-10:40 pm

1 stop4h 50m

Boston Logan Intl

Fri 12/5

5:35 pm-10:05 pm

1 stop4h 30m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/20

Showing 1-10 of 33 results
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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

What is the cheapest month to book a flight from Islip to New Hampshire?

Currently, January is the cheapest month in which you can book a flight from Islip to New Hampshire (average of $334). Flying from Islip to New Hampshire in April is currently the most expensive (average of $398). 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.

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 to New Hampshire?

    Departing from Islip to New Hampshire will take you 5h 15m. Airlines will cover a distance of 243 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Islip to New Hampshire one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $142. However, be on the lookout for offers from Southwest and Breeze Airways, as they are both options that can get you from Islip to New Hampshire for a low price.

  • What are the most popular routes from Islip 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 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.

  • What is the cheapest month to book a flight from Islip to New Hampshire?

    Currently, January is the cheapest month in which you can book a flight from Islip to New Hampshire (average of $334). Flying from Islip to New Hampshire in April is currently the most expensive (average of $398). 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.

See more FAQs

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