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New Hampshire

$138+ 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
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 septiembre 16, 2025.

Round-trip from

$251
(Southwest)

One-way from

$138
(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. 7% potential increase in price ($19 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 septiembre 16, 2025.

This Southwest deal was found by Cheapflights users on 9/14. 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.
jue. 11/1311:05 amISP - PWM
1 stop5h 45mSouthwest
mar. 11/185:30 amPWM - ISP
1 stop6h 45mSouthwest
Deal found 9/14$251
This Southwest deal was found by Cheapflights users on 9/15. 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.
sáb. 11/83:40 pmISP - PWM
1 stop6h 15mSouthwest
sáb. 11/153:15 pmPWM - ISP
1 stop6h 30mSouthwest
Deal found 9/15$265
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
mar. 10/149:37 pmISP - BOS
2 stops13h 49mMultiple Airlines
mar. 10/212:15 pmBOS - ISP
1 stop20h 42mMultiple Airlines
Deal found 9/16$267
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
dom. 10/269:47 pmISP - BOS
1 stop10h 46mMultiple Airlines
mié. 10/296:16 amBOS - ISP
2 stops31h 23mMultiple Airlines
Deal found 9/15$288
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
sáb. 11/88:45 pmISP - PWM
1 stop20h 15mBreeze Airways
sáb. 11/156:18 pmPWM - ISP
2 stops16h 42mBreeze Airways
Deal found 9/15$290
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
vie. 10/35:05 pmISP - BOS
1 stop20h 43mMultiple Airlines
lun. 10/62:15 pmBOS - ISP
1 stop30h 27mMultiple Airlines
Deal found 9/16$293
This Southwest deal was found by Cheapflights users on 9/14. 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.
sáb. 10/2511:55 amISP - PWM
1 stop4h 15mSouthwest
dom. 10/265:30 amPWM - ISP
1 stop6h 40mSouthwest
Deal found 9/14$296
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
mar. 9/2311:25 amISP - BOS
2 stops44h 27mMultiple Airlines
mar. 9/3012:20 pmBOS - ISP
1 stop22h 20mMultiple Airlines
Deal found 9/15$302
This Southwest deal was found by Cheapflights users on 9/14. 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.
vie. 11/145:50 amISP - PWM
1 stop5h 20mSouthwest
dom. 11/165:25 pmPWM - ISP
1 stop6h 25mSouthwest
Deal found 9/14$309
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
mar. 10/149:37 pmISP - PWM
1 stop12h 59mMultiple Airlines
mar. 10/216:29 pmPWM - ISP
1 stop25h 36mMultiple Airlines
Deal found 9/14$311
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
sáb. 9/277:32 pmISP - PWM
1 stop21h 28mBreeze Airways
mar. 9/301:18 pmPWM - ISP
1 stop30h 47mBreeze Airways
Deal found 9/15$314
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
sáb. 9/275:05 pmISP - BOS
2 stops16h 53mMultiple Airlines
mié. 10/112:20 pmBOS - ISP
1 stop22h 35mMultiple Airlines
Deal found 9/14$323

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 septiembre 16, 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

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

jue. 11/13

11:05 am-4:50 pm

1 stop5h 45m

Portland

mar. 11/18

5:30 am-12:15 pm

1 stop6h 45m

$251

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

sáb. 11/8

3:40 pm-9:55 pm

1 stop6h 15m

Portland

sáb. 11/15

3:15 pm-9:45 pm

1 stop6h 30m

$265

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

mar. 10/14

9:37 pm-1:20 pm

1 stop15h 43m

Boston Logan Intl

mar. 10/21

2:15 pm-10:57 am

1 stop20h 42m

$271

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

dom. 10/26

9:47 pm-8:33 am

1 stop10h 46m

Boston Logan Intl

mié. 10/29

6:16 am-1:39 pm

2 stops31h 23m

$288

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

sáb. 11/8

8:45 pm-5:00 pm

1 stop20h 15m

Portland

sáb. 11/15

6:18 pm-11:00 am

2 stops16h 42m

$290

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

vie. 11/14

5:50 am-11:10 am

1 stop5h 20m

Portland

dom. 11/16

5:25 pm-11:50 pm

1 stop6h 25m

$309

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

mar. 10/14

9:37 pm-10:36 am

1 stop12h 59m

Portland

mar. 10/21

6:29 pm-8:05 pm

1 stop25h 36m

$311

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

sáb. 9/27

7:32 pm-5:00 pm

1 stop21h 28m

Portland

mar. 9/30

1:18 pm-8:05 pm

1 stop30h 47m

$314

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

sáb. 9/27

5:05 pm-9:58 am

2 stops16h 53m

Boston Logan Intl

mié. 10/1

12:20 pm-10:55 am

1 stop22h 35m

$323

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

mar. 11/4

3:55 pm-10:15 pm

1 stop6h 20m

Boston Logan Intl

vie. 11/7

7:55 pm-11:50 pm

1 stop3h 55m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 32 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 45m. 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 JetBlue, with whom users have recently found tickets for as low as $152. 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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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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