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New Hampshire

$129+ 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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
Apr 7 — Apr 141
Tue 4/7
Tue 4/14
1 adult, Economy
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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 March 8, 2026.

This Southwest deal was found by Cheapflights users on 3/5. 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 4/308:35 am
ISP
-
BOS
1 stop3h 35m
Southwest
Mon 5/45:30 am
BOS
-
ISP
1 stop6h 20m
Southwest
Deal found 3/5$327
This Southwest deal was found by Cheapflights users on 3/6. 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 8/116:05 am
ISP
-
BOS
2 stops10h 05m
Southwest
Sat 8/158:10 am
BOS
-
ISP
1 stop6h 20m
Southwest
Deal found 3/6$332
This Kiwi.com deal was found by Cheapflights users on 3/4. 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 3/297:26 pm
ISP
-
BOS
2 stops40h 15m
Multiple Airlines
Thu 4/29:45 am
BOS
-
ISP
1 stop10h 06m
Multiple Airlines
Deal found 3/4$334
This Southwest deal was found by Cheapflights users on 3/4. 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 8/710:20 am
ISP
-
BOS
1 stop4h 10m
Southwest
Mon 8/109:40 am
BOS
-
ISP
1 stop6h 45m
Southwest
Deal found 3/4$337
This Southwest deal was found by Cheapflights users on 3/3. 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 7/1112:15 pm
ISP
-
BOS
1 stop3h 30m
Southwest
Sun 7/199:40 pm
BOS
-
ISP
1 stop10h 40m
Southwest
Deal found 3/3$342
This Southwest deal was found by Cheapflights users on 3/6. 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 4/104:30 pm
ISP
-
PWM
1 stop6h 55m
Southwest
Tue 4/143:55 pm
PWM
-
ISP
1 stop6h 15m
Southwest
Deal found 3/6$347
This Southwest deal was found by Cheapflights users on 3/6. 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 7/3112:30 pm
ISP
-
BOS
1 stop4h 40m
Southwest
Sun 8/25:30 am
BOS
-
ISP
1 stop6h 15m
Southwest
Deal found 3/6$357
This Southwest deal was found by Cheapflights users on 3/6. 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 5/234:40 pm
ISP
-
PWM
1 stop6h 30m
Southwest
Fri 5/294:50 pm
PWM
-
ISP
1 stop6h 40m
Southwest
Deal found 3/6$357
This Southwest deal was found by Cheapflights users on 3/7. 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.
Wed 4/812:30 pm
ISP
-
BOS
1 stop3h 25m
Southwest
Fri 4/104:45 pm
BOS
-
ISP
1 stop3h 40m
Southwest
Deal found 3/7$363
This Southwest deal was found by Cheapflights users on 3/7. 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.
Fri 3/275:55 pm
ISP
-
PWM
1 stop6h 10m
Southwest
Mon 3/305:30 pm
PWM
-
ISP
1 stop6h 25m
Southwest
Deal found 3/7$365
This Southwest deal was found by Cheapflights users on 3/3. 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 3/285:50 pm
ISP
-
BOS
1 stop6h 15m
Southwest
Wed 4/15:45 am
BOS
-
ISP
1 stop5h 55m
Southwest
Deal found 3/3$367
This JetBlue deal was found by Cheapflights users on 3/4. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1012:25 pm
ISP
-
BOS
1 stop11h 02m
JetBlue
Wed 6/171:28 pm
BOS
-
ISP
1 stop9h 49m
JetBlue
Deal found 3/4$373

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 March 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$327
(Southwest)

One-way from

$129
(Kiwi.com)

Popular in

February

Cheapest in

November

Average price

$254
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. 6% potential increase in price ($16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 8, 2026.
Use the filters below to find and compare flights from Islip to New Hampshire that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Thu 4/30

8:35 am-12:10 pm

1 stop3h 35m

Boston Logan Intl

Mon 5/4

5:30 am-11:50 am

1 stop6h 20m

$327

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Sat 7/11

12:15 pm-3:45 pm

1 stop3h 30m

Boston Logan Intl

Sun 7/19

9:40 pm-8:20 am

1 stop10h 40m

$342

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Fri 4/10

4:30 pm-11:25 pm

1 stop6h 55m

Portland

Tue 4/14

3:55 pm-10:10 pm

1 stop6h 15m

$347

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Sat 5/23

4:40 pm-11:10 pm

1 stop6h 30m

Portland

Fri 5/29

2:50 pm-8:25 pm

1 stop5h 35m

$357

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Fri 3/27

5:55 pm-12:05 am

1 stop6h 10m

Portland

Mon 3/30

5:30 pm-11:55 pm

1 stop6h 25m

$365

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Sat 3/28

5:50 pm-12:05 am

1 stop6h 15m

Boston Logan Intl

Wed 4/1

2:00 pm-10:50 pm

2 stops8h 50m

$372

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Wed 3/18

11:50 am-11:40 am

1 stop23h 50m

Boston Logan Intl

Fri 3/20

12:56 pm-11:10 am

1 stop22h 14m

$386

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Mon 6/8

6:00 am-9:45 am

1 stop3h 45m

Portland

Fri 6/12

1:00 pm-11:35 pm

2 stops10h 35m

$392

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 3/20

6:00 am-4:40 pm

2 stops10h 40m

Boston Logan Intl

Sat 3/28

4:45 pm-11:35 pm

1 stop6h 50m

$403

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 7/31

12:30 pm-10:50 pm

2 stops10h 20m

Boston Logan Intl

Sun 8/2

5:30 am-11:45 am

1 stop6h 15m

$412

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/4

Showing 1-10 of 49 resultsSorted by cheapest first
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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
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 and Breeze Airways can get you from Islip, New York to New Hampshire in just under 3h 35m. Your travel time can differ by up to 19h 18m. 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.

See more FAQs

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