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New Hampshire

$99+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MHT
Jul 30 — Aug 61
Wed 7/30
Wed 8/6
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 July 25, 2025.

Round-trip from

$197
(Southwest)

One-way from

$99
(Southwest)

Popular in

April

Cheapest in

September

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. 16% potential increase in price ($40 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 25, 2025.

This Southwest deal was found by Cheapflights users on 7/23. 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.
Tue 10/284:55 pmISP - BOS
1 stop5h 45mSouthwest
Wed 10/297:50 amBOS - ISP
1 stop4h 35mSouthwest
Deal found 7/23$197
This Southwest deal was found by Cheapflights users on 7/24. 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 9/275:40 amISP - PWM
1 stop4h 35mSouthwest
Thu 10/25:15 pmPWM - ISP
1 stop6h 30mSouthwest
Deal found 7/24$197
This Southwest deal was found by Cheapflights users on 7/22. 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.
Mon 9/1512:10 pmISP - MHT
1 stop4h 45mSouthwest
Fri 9/264:30 pmMHT - ISP
1 stop6h 25mSouthwest
Deal found 7/22$279
This KAYAK deal was found by Cheapflights users on 7/24. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/264:33 pmISP - BOS
Nonstop1h 27mCape Air
Sun 7/279:27 amBOS - ISP
Nonstop1h 31mCape Air
Deal found 7/24$404
This FlightHub deal was found by Cheapflights users on 7/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/122:25 pmISP - PWM
1 stop23h 16mBreeze Airways
Sun 9/145:33 pmPWM - ISP
1 stop24h 55mBreeze Airways
Deal found 7/22$541

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 July 25, 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

Sat 9/27

5:40 am-10:15 am

1 stop4h 35m

Portland

Thu 10/2

5:15 pm-11:45 pm

1 stop6h 30m

$197

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Tue 10/28

4:55 pm-10:40 pm

1 stop5h 45m

Boston Logan Intl

Wed 10/29

7:50 am-12:25 pm

1 stop4h 35m

$197

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

Mon 9/15

12:10 pm-4:55 pm

1 stop4h 45m

Manchester

Fri 9/26

4:30 pm-10:55 pm

1 stop6h 25m

$279

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Sat 9/6

7:30 am-8:57 am

Nonstop1h 27m

Boston Logan Intl

Sat 9/13

6:30 pm-8:01 pm

Nonstop1h 31m

$496

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Fri 9/12

2:25 pm-1:41 pm

1 stop23h 16m

Portland

Sun 9/14

5:33 pm-6:28 pm

1 stop24h 55m

$541

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

Sat 8/9

2:19 pm-5:45 pm

3 stops27h 26m

Manchester

Wed 8/13

6:44 pm-6:59 pm

3 stops24h 15m

$1,096

IslipPortland

ISP - PWM

ISPPWM

Islip Long Island

Fri 8/22

3:05 pm-11:20 pm

1 stop8h 15m

$115

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Sun 8/24

6:00 am-9:45 am

1 stop3h 45m

$164

IslipManchester

ISP - MHT

ISPMHT

Islip Long Island

Fri 8/15

3:05 pm-7:55 pm

1 stop4h 50m

$174

IslipBoston

ISP - BOS

ISPBOS

Islip Long Island

Fri 8/29

11:40 am-8:15 pm

1 stop8h 35m

$202

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 13 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, January is the cheapest month in which you can book a flight from Islip, New York to New Hampshire (average of $334). Flying from Islip, New York to New Hampshire in April is currently the most expensive (average of $396). 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.

Reviews of airlines servicing New Hampshire

Get insights into the airlines that provide service to New Hampshire. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to New Hampshire. Reviews last updated July 25, 2025.
Get a feel of what it's like to fly with Southwest, Breeze Airways, and JetBlue from Islip to New Hampshire by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,235 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Breeze Airways
8.0
Very good
189 reviews
Southwest
8.0
Very good
4,235 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
JetBlue
7.3
Good
2,912 reviews
Southwest
8.0
Very good
4,235 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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.

  • What are the cheapest airlines to fly from Islip, New York to New Hampshire one-way?

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $99. However, be on the lookout for offers from JetBlue and Cape Air, as they are both options that can get you from Islip, New York to New Hampshire for a low price.

  • 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, January is the cheapest month in which you can book a flight from Islip, New York to New Hampshire (average of $334). Flying from Islip, New York to New Hampshire in April is currently the most expensive (average of $396). 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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