HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
New Hampshire

$203+ Cheap flights from Islip, NY (ISP) to New Hampshire

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
Jan 7 — Jan 141
Wed 1/7
Wed 1/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to New Hampshire with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 December 8, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/7. 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 12/1510:19 amISP - BOS
1 stop23h 42mMultiple Airlines
Tue 12/168:11 pmBOS - ISP
1 stop26h 33mMultiple Airlines
Deal found 12/7$210
This Kiwi.com deal was found by Cheapflights users on 12/7. 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 12/1310:19 amISP - BOS
1 stop23h 08mFrontier
Sun 12/1412:57 pmBOS - ISP
1 stop20h 16mFrontier
Deal found 12/7$258
This Kiwi.com deal was found by Cheapflights users on 12/7. 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 12/1110:19 amISP - BOS
1 stop23h 38mMultiple Airlines
Sat 12/138:11 pmBOS - ISP
1 stop14h 09mMultiple Airlines
Deal found 12/7$335
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/176:00 amISP - BOS
1 stop27h 52mMultiple Airlines
Mon 12/226:00 amBOS - ISP
2 stops13h 40mMultiple Airlines
Deal found 12/8$349
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/1812:20 pmISP - BOS
1 stop21h 41mMultiple Airlines
Mon 12/226:00 amBOS - ISP
2 stops13h 40mMultiple Airlines
Deal found 12/8$351
This Kiwi.com deal was found by Cheapflights users on 12/7. 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 12/1310:19 amISP - BOS
1 stop23h 08mMultiple Airlines
Sun 12/142:34 pmBOS - ISP
Nonstop1h 36mMultiple Airlines
Deal found 12/7$360
This Kiwi.com deal was found by Cheapflights users on 12/7. 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 12/191:27 pmISP - BOS
1 stop20h 34mMultiple Airlines
Sun 12/2110:56 amBOS - ISP
1 stop26h 13mMultiple Airlines
Deal found 12/7$365
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/168:29 pmISP - BOS
1 stop13h 32mMultiple Airlines
Mon 12/226:00 amBOS - ISP
2 stops13h 40mMultiple Airlines
Deal found 12/8$367
This Southwest deal was found by Cheapflights users on 12/7. 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 12/83:55 pmISP - PWM
1 stop6h 20mSouthwest
Mon 12/155:30 amPWM - ISP
1 stop6h 45mSouthwest
Deal found 12/7$637
This Gotogate deal was found by Cheapflights users on 12/7. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:47 pmISP - PWM
2 stops37h 49mBreeze Airways
Mon 12/1511:21 amPWM - ISP
2 stops23h 07mBreeze Airways
Deal found 12/7$1,067

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 December 8, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$250
(Kiwi.com)

One-way from

$215
(Southwest)

Popular in

April

Cheapest in

November

Average price

$223
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. 3% potential increase in price ($8 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 8, 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

Mon 1/5

8:24 pm-10:01 am

1 stop13h 37m

Boston Logan Intl

Mon 1/12

11:41 am-7:51 pm

1 stop8h 10m

$208

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Tue 1/6

6:00 am-12:10 pm

1 stop6h 10m

Portland

Tue 1/13

5:45 am-11:55 am

1 stop6h 10m

$289

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 3/13

6:00 am-9:50 am

1 stop3h 50m

Boston Logan Intl

Mon 3/16

5:30 am-11:40 am

1 stop6h 10m

$347

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Thu 4/2

2:00 pm-6:05 pm

1 stop4h 05m

Boston Logan Intl

Sun 4/5

5:15 am-11:45 am

1 stop6h 30m

$347

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 2/6

11:50 am-10:55 pm

2 stops11h 05m

Boston Logan Intl

Tue 2/10

5:30 am-4:15 pm

2 stops10h 45m

$347

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 12/19

1:27 pm-10:01 am

1 stop20h 34m

Boston Logan Intl

Sun 12/21

10:56 am-1:09 pm

1 stop26h 13m

$365

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 3/13

6:00 am-9:50 am

1 stop3h 50m

Boston Logan Intl

Sun 3/15

5:15 am-11:45 am

1 stop6h 30m

$367

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 2/13

1:10 pm-9:10 pm

1 stop8h 00m

Boston Logan Intl

Sun 2/15

6:40 pm-10:20 pm

1 stop3h 40m

$383

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Fri 6/5

12:30 pm-4:45 pm

1 stop4h 15m

Portland

Mon 6/8

10:25 am-2:30 pm

1 stop4h 05m

$387

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 12/19

1:27 pm-10:21 am

1 stop20h 54m

Boston Logan Intl

Mon 12/22

6:00 am-7:40 pm

2 stops13h 40m

$406

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 24 results
1
2
3

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 10m. 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 - Manchester or Islip Long Island - Portland 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to New Hampshire

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Miami flights
John F Kennedy Intl to Fort Lauderdale flights
Newark to Fort Lauderdale flights
LaGuardia to Miami flights
Newark to Miami flights
LaGuardia to Fort Lauderdale flights
John F Kennedy Intl to Las Vegas flights
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Orlando flights
Newark to West Palm Beach flights
John F Kennedy Intl to Dallas/Fort Worth flights
John F Kennedy Intl to West Palm Beach flights
Newark to Las Vegas flights
Newark to Los Angeles flights
LaGuardia to Dallas/Fort Worth flights
Newark to Dallas/Fort Worth flights
Newark to Orlando flights
John F Kennedy Intl to Atlanta flights
John F Kennedy Intl to San Francisco flights
LaGuardia to Orlando flights
John F Kennedy Intl to Hobby flights
LaGuardia to Tampa flights
John F Kennedy Intl to Sky Harbor Intl flights
LaGuardia to Atlanta flights
John F Kennedy Intl to Tampa flights
LaGuardia to Los Angeles flights
LaGuardia to Hobby flights
Newark to San Francisco flights
John F Kennedy Intl to New Orleans flights
LaGuardia to West Palm Beach flights
Newark to Hobby flights
LaGuardia to Las Vegas flights
Newark to Sky Harbor Intl flights
John F Kennedy Intl to O'Hare Intl flights
John F Kennedy Intl to Denver flights
Newark to Tampa flights
John F Kennedy Intl to Salt Lake City flights
Newark to New Orleans flights
John F Kennedy Intl to Seattle flights
John F Kennedy Intl to Honolulu flights
Newark to Denver flights
John F Kennedy Intl to George Bush Intcntl flights
Newark to George Bush Intcntl flights
LaGuardia to New Orleans flights
Newark to Fort Myers flights
LaGuardia to Denver flights
Newark to Atlanta flights
John F Kennedy Intl to Austin flights
Newark to Salt Lake City flights
LaGuardia to San Francisco flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.