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New Hampshire

$121+ 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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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 October 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/23. 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 11/1311:40 amISP - BOS
2 stops24h 24mMultiple Airlines
Thu 11/205:45 pmBOS - ISP
1 stop16h 52mMultiple Airlines
Deal found 10/23$244
This Kiwi.com deal was found by Cheapflights users on 10/20. 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.
Fri 10/314:58 pmISP - BOS
1 stop15h 30mFrontier
Sun 11/28:40 amBOS - ISP
2 stops25h 57mFrontier
Deal found 10/20$267
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 11/2010:02 amISP - BOS
1 stop30h 48mMultiple Airlines
Thu 11/275:45 pmBOS - ISP
1 stop16h 52mMultiple Airlines
Deal found 10/23$269
This Southwest deal was found by Cheapflights users on 10/23. 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 12/113:55 pmISP - BOS
1 stop6h 20mSouthwest
Sun 12/147:55 pmBOS - ISP
1 stop3h 55mSouthwest
Deal found 10/23$285
This Kiwi.com deal was found by Cheapflights users on 10/21. 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.
Wed 10/294:58 pmISP - BOS
1 stop20h 22mMultiple Airlines
Wed 11/56:16 amBOS - ISP
2 stops35h 26mMultiple Airlines
Deal found 10/21$310
This Southwest deal was found by Cheapflights users on 10/22. 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 12/512:55 pmISP - BOS
1 stop6h 25mSouthwest
Sun 12/77:05 amBOS - ISP
1 stop5h 45mSouthwest
Deal found 10/22$313
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 11/88:45 pmISP - MHT
2 stops13h 52mBreeze Airways
Mon 11/109:59 amMHT - ISP
1 stop10h 08mBreeze Airways
Deal found 10/22$339
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 11/67:36 pmISP - MHT
2 stops13h 43mBreeze Airways
Mon 11/109:59 amMHT - ISP
1 stop10h 08mBreeze Airways
Deal found 10/22$345
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 11/186:27 pmISP - PWM
1 stop16h 09mMultiple Airlines
Tue 11/257:35 pmPWM - ISP
2 stops39h 25mMultiple Airlines
Deal found 10/21$407
This Southwest deal was found by Cheapflights users on 10/22. 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 11/86:00 amISP - MHT
1 stop6h 05mSouthwest
Mon 11/105:20 pmMHT - ISP
1 stop6h 30mSouthwest
Deal found 10/22$409
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 10/306:37 pmISP - PWM
1 stop14h 29mMultiple Airlines
Thu 11/65:40 pmPWM - ISP
1 stop24h 48mMultiple Airlines
Deal found 10/23$446
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 11/72:25 pmISP - PWM
1 stop20h 16mBreeze Airways
Tue 11/116:29 pmPWM - ISP
1 stop25h 36mBreeze Airways
Deal found 10/23$449

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 October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$166
(Kiwi.com)

One-way from

$121
(JetBlue)

Popular in

April

Cheapest in

November

Average price

$197
Provider with most accurate pricing for New York (NYC)-Boston Logan Intl flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Boston Logan Intl flights.
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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. 5% potential increase in price ($14 potential increase over avg. RT price).
Search Deals
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 October 2025
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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 October 23, 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

Fri 10/31

4:58 pm-8:28 am

1 stop15h 30m

Boston Logan Intl

Sun 11/2

8:40 am-10:37 am

2 stops25h 57m

$267

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Thu 12/11

3:55 pm-10:15 pm

1 stop6h 20m

Boston Logan Intl

Sun 12/14

7:55 pm-11:50 pm

1 stop3h 55m

$285

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Wed 10/29

4:58 pm-1:20 pm

1 stop20h 22m

Boston Logan Intl

Wed 11/5

6:16 am-5:42 pm

2 stops35h 26m

$310

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 12/5

12:55 pm-7:20 pm

1 stop6h 25m

Boston Logan Intl

Sun 12/7

7:05 am-12:50 pm

1 stop5h 45m

$313

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

Sat 11/8

8:45 pm-10:37 am

2 stops13h 52m

Manchester

Mon 11/10

9:59 am-8:07 pm

1 stop10h 08m

$339

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

Thu 11/6

7:36 pm-9:19 am

2 stops13h 43m

Manchester

Mon 11/10

9:59 am-8:07 pm

1 stop10h 08m

$345

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Thu 10/30

6:37 pm-1:20 pm

1 stop18h 43m

Boston Logan Intl

Mon 11/3

12:20 pm-5:42 pm

2 stops29h 22m

$346

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Mon 12/1

9:02 am-8:49 pm

2 stops35h 47m

Boston Logan Intl

Sun 12/7

9:32 pm-9:13 am

1 stop11h 41m

$356

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Wed 11/12

12:55 pm-7:20 pm

1 stop6h 25m

Boston Logan Intl

Fri 11/14

7:05 am-12:50 pm

1 stop5h 45m

$367

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Tue 11/18

6:27 pm-10:36 am

1 stop16h 09m

Portland

Tue 11/25

7:35 pm-11:00 am

2 stops39h 25m

$407

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

Showing 1-10 of 30 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, New York to New Hampshire?

Currently, July is the cheapest month in which you can book a flight from Islip, New York to New Hampshire (average of $77). Flying from Islip, New York to New Hampshire in April is currently the most expensive (average of $301). 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, New York to New Hampshire?

    Frontier, Southwest, and Breeze Airways can get you from Islip, New York to New Hampshire in just under 6h 20m. Your travel time can differ by up to 9h 10m. Islip, New York and New Hampshire are separated by a distance of 153 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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.

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

    Currently, July is the cheapest month in which you can book a flight from Islip, New York to New Hampshire (average of $77). Flying from Islip, New York to New Hampshire in April is currently the most expensive (average of $301). 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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Alternative routes for Islip to New Hampshire

See prices for flight routes from nearby airports that may be better suited for you.
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