HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$135+ Cheap flights from New Hampshire to Islip (ISP)

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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
MHT — ISP
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from New Hampshire to Islip 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 New Hampshire to Islip

Keep the following information in mind while searching for New Hampshire to Islip flight deals. Data was last updated September 16, 2025.

Round-trip from

$237
(Southwest)

One-way from

$135
(Kiwi.com)

Popular in

February

Cheapest in

October

Average price

$182
From New Hampshire to Islip Long Island
Search Deals
One-way flight from New Hampshire to Islip Long Island
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from New Hampshire to Islip

Cheapest flights from New Hampshire to Islip
Explore the most affordable flight options available from New Hampshire to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/125:30 amPWM - ISP
1 stop6h 45mSouthwest
Wed 11/123:55 pmISP - PWM
1 stop6h 20mSouthwest
Deal found 9/16$237
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.
Tue 10/142:15 pmBOS - ISP
1 stop20h 42mMultiple Airlines
Tue 10/219:37 pmISP - BOS
1 stop15h 43mMultiple Airlines
Deal found 9/14$270
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.
Fri 12/128:48 amBOS - ISP
1 stop4h 57mMultiple Airlines
Sun 12/149:09 pmISP - BOS
1 stop12h 59mMultiple Airlines
Deal found 9/16$277
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.
Fri 10/312:40 pmPWM - ISP
1 stop6h 30mSouthwest
Mon 11/35:40 amISP - PWM
1 stop6h 30mSouthwest
Deal found 9/14$278
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.
Mon 9/2912:59 pmBOS - ISP
2 stops21h 41mMultiple Airlines
Fri 10/35:05 pmISP - BOS
1 stop20h 43mMultiple Airlines
Deal found 9/14$290
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.
Thu 10/212:59 pmBOS - ISP
2 stops21h 41mMultiple Airlines
Mon 10/65:05 pmISP - BOS
1 stop20h 15mMultiple Airlines
Deal found 9/14$300
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/115:30 amPWM - ISP
1 stop6h 45mSouthwest
Tue 11/113:55 pmISP - PWM
1 stop6h 20mSouthwest
Deal found 9/16$326
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.
Fri 11/147:55 pmBOS - ISP
1 stop3h 55mSouthwest
Mon 11/1712:55 pmISP - BOS
1 stop6h 15mSouthwest
Deal found 9/14$327
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.
Fri 10/179:15 amPWM - ISP
1 stop7h 35mSouthwest
Mon 10/275:30 amISP - PWM
1 stop5h 40mSouthwest
Deal found 9/15$347
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.
Sun 12/141:30 pmBOS - ISP
2 stops10h 20mSouthwest
Mon 12/295:50 pmISP - BOS
1 stop3h 45mSouthwest
Deal found 9/14$352
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.
Sat 11/295:15 amPWM - ISP
1 stop6h 30mSouthwest
Sun 11/306:10 pmISP - PWM
1 stop6h 00mSouthwest
Deal found 9/14$560
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.
Sun 9/215:40 pmPWM - ISP
1 stop24h 48mMultiple Airlines
Thu 9/2511:40 amISP - PWM
1 stop21h 26mMultiple Airlines
Deal found 9/15$589

Cheapflights Fare Finder

 
Customize your flight search to find flights from New Hampshire to Islip 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 16, 2025.
Use the filters below to find and compare flights from New Hampshire to Islip that are best for you.

Fly from

New Hampshire

Fly to

Islip

Route

Depart

Return

Price

PortlandIslip

PWM - ISP

PWMISP

Portland

Wed 11/12

5:30 am-12:15 pm

1 stop6h 45m

Islip Long Island

Wed 11/12

3:55 pm-10:15 pm

1 stop6h 20m

$237

BostonIslip

BOS - ISP

BOSISP

Boston Logan Intl

Fri 12/12

8:48 am-1:45 pm

1 stop4h 57m

Islip Long Island

Sun 12/14

9:09 pm-10:08 am

1 stop12h 59m

$277

PortlandIslip

PWM - ISP

PWMISP

Portland

Fri 10/31

2:40 pm-9:10 pm

1 stop6h 30m

Islip Long Island

Mon 11/3

5:40 am-12:10 pm

1 stop6h 30m

$278

BostonIslip

BOS - ISP

BOSISP

Boston Logan Intl

Tue 10/14

3:00 pm-10:57 am

2 stops19h 57m

Islip Long Island

Tue 10/21

9:37 pm-1:20 pm

1 stop15h 43m

$288

BostonIslip

BOS - ISP

BOSISP

Boston Logan Intl

Mon 9/29

12:59 pm-10:40 am

2 stops21h 41m

Islip Long Island

Fri 10/3

5:05 pm-1:48 pm

1 stop20h 43m

$290

BostonIslip

BOS - ISP

BOSISP

Boston Logan Intl

Thu 10/2

2:53 pm-10:40 am

1 stop19h 47m

Islip Long Island

Mon 10/6

5:05 pm-1:20 pm

1 stop20h 15m

$314

PortlandIslip

PWM - ISP

PWMISP

Portland

Tue 11/11

5:30 am-12:15 pm

1 stop6h 45m

Islip Long Island

Tue 11/11

3:55 pm-10:15 pm

1 stop6h 20m

$326

BostonIslip

BOS - ISP

BOSISP

Boston Logan Intl

Fri 11/14

7:55 pm-11:50 pm

1 stop3h 55m

Islip Long Island

Mon 11/17

12:55 pm-7:10 pm

1 stop6h 15m

$327

BostonIslip

BOS - ISP

BOSISP

Boston Logan Intl

Sun 12/14

7:55 pm-11:50 pm

1 stop3h 55m

Islip Long Island

Mon 12/29

5:40 am-11:00 am

1 stop5h 20m

$327

PortlandIslip

PWM - ISP

PWMISP

Portland

Fri 10/17

9:15 am-4:50 pm

1 stop7h 35m

Islip Long Island

Mon 10/27

5:30 am-11:10 am

1 stop5h 40m

$347

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 30 results
1
2
3

Best time to book a flight from New Hampshire to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from New Hampshire 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 New Hampshire to Islip

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

Currently, January is the cheapest month in which you can book a flight from New Hampshire to Islip (average of $108). Flying from New Hampshire to Islip in November is currently the most expensive (average of $213). 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 New Hampshire to Islip. 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 into for flights to Islip from New Hampshire?

    Islip Long Island (ISP) is the airport you will fly into if you book a flight from New Hampshire to Islip. It is only a 7.2 mi journey from Long Island (ISP) to Islip’s city center.

  • How long is the flight from New Hampshire to Islip?

    There are many flights that can get you from New Hampshire to Islip in 6h 45m. Fly via Southwest to get the fastest option. The distance from New Hampshire to Islip is about 243 mi.

  • Can I find deals for flights from New Hampshire to Islip that include hotel bookings?

    Yes. In addition to deals on New Hampshire to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from New Hampshire to Islip?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from New Hampshire to Islip.

  • Can I find deals for business class flights from New Hampshire to Islip?

    Yes. Cheapflights offers flight deals from New Hampshire to Islip 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 New Hampshire to Islip?

    Currently, January is the cheapest month in which you can book a flight from New Hampshire to Islip (average of $108). Flying from New Hampshire to Islip in November is currently the most expensive (average of $213). 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

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

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 New Hampshire to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
Dallas/Fort Worth to John F Kennedy Intl flights
Dallas/Fort Worth to LaGuardia flights
O'Hare Intl to John F Kennedy Intl flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Newark flights
O'Hare Intl to LaGuardia flights
Dallas/Fort Worth to Newark flights
Los Angeles to LaGuardia flights
San Francisco to Newark flights
Atlanta to John F Kennedy Intl flights
O'Hare Intl to Newark flights
Atlanta to LaGuardia flights
Miami to John F Kennedy Intl flights
Fort Lauderdale to LaGuardia flights
Hobby to Newark flights
Ontario to John F Kennedy Intl flights
Hobby to LaGuardia flights
Fort Lauderdale to Newark flights
San Francisco to LaGuardia flights
Hobby to John F Kennedy Intl flights
Atlanta to Newark flights
Miami to Newark flights
Miami to LaGuardia flights
Minneapolis to LaGuardia flights
Raleigh to LaGuardia flights
Raleigh to John F Kennedy Intl flights
Fort Lauderdale to John F Kennedy Intl flights
Orlando to John F Kennedy Intl flights
Minneapolis to John F Kennedy Intl flights
Denver to John F Kennedy Intl flights
George Bush Intcntl to John F Kennedy Intl flights
George Bush Intcntl to Newark flights
Charlotte to John F Kennedy Intl flights
Seattle to John F Kennedy Intl flights
Seattle to Newark flights
Burbank to Newark flights
Tampa to LaGuardia flights
Denver to LaGuardia flights
Austin to Newark flights
Sky Harbor Intl to John F Kennedy Intl flights
Ontario to Newark flights
Minneapolis to Newark flights
Austin to John F Kennedy Intl flights
San Diego to John F Kennedy Intl flights
Indianapolis to LaGuardia flights
Cincinnati to John F Kennedy Intl flights
Denver to Newark flights
Santa Ana to Newark flights
Tampa to John F Kennedy Intl flights

Top airline flying from New Hampshire to Islip

Discover the top airline that operate flights from New Hampshire to Islip. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$254Average$428FlexibilityNo cancel feeOn-time63%

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.