Cheap Flights from Portsmouth (PSM) to Islip (ISP)

Popular airlines from Portsmouth, NH (PSM-Portsmouth Intl.) to MacArthur Airport (ISP)

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Cheap Flights from Portsmouth to Islip (PSM-ISP)

Prices were available within the past 7 days and start at for one-way flights and $470 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Breeze Airways
Sun, Jan 25 - Fri, Jan 30
PSM
Portsmouth
ISP
Islip
$470 Roundtrip, found 19 hours ago
$470
Roundtrip
found 19 hours ago
Select Breeze Airways flight, departing Sun, Jan 25 from Portsmouth to Islip, returning Fri, Jan 30, priced at $470 found 19 hours ago
Breeze Airways
Sun, Jan 4 - Tue, Jan 20
PSM
Portsmouth
ISP
Islip
$480 Roundtrip, found 20 hours ago
$480
Roundtrip
found 20 hours ago
Select Breeze Airways flight, departing Sun, Jan 4 from Portsmouth to Islip, returning Tue, Jan 20, priced at $480 found 20 hours ago
Breeze Airways
Sun, Jan 18 - Fri, Jan 30
PSM
Portsmouth
ISP
Islip
$489 Roundtrip, found 20 hours ago
$489
Roundtrip
found 20 hours ago
Select Breeze Airways flight, departing Sun, Jan 18 from Portsmouth to Islip, returning Fri, Jan 30, priced at $489 found 20 hours ago
Breeze Airways
Sun, Jan 25 - Fri, Feb 6
PSM
Portsmouth
ISP
Islip
$512 Roundtrip, found 19 hours ago
$512
Roundtrip
found 19 hours ago
Select Breeze Airways flight, departing Sun, Jan 25 from Portsmouth to Islip, returning Fri, Feb 6, priced at $512 found 19 hours ago
Flights from Portsmouth (PSM) to Islip (ISP)
Origin airport
Portsmouth Intl.
Destination airport
MacArthur
Airlines serving
Breeze Airways
Roundtrip price
$470
Distance
197 mi

Portsmouth to Islip Flights

The cheapest times to fly from Portsmouth to Islip

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Portsmouth to Islip are during the month of January. You can find some of the cheapest flights from Portsmouth to Islip with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portsmouth to Islip

Sunday is one of the best days to book for cheap flights from Portsmouth to Islip: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Portsmouth to Islip

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Portsmouth to Islip in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Portsmouth to Islip flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Portsmouth to Islip airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP) cost?
Grab a cheap one-way flight or cheap return flight from $470 from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP)?
Flying in January is a good way to save, as it's the cheapest month for flights between PSM and ISP. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest PSM to ISP flight.
How many flights per day from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP)?
There aren't any daily nonstop flights from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from PSM to ISP?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP)?
To reach MacArthur Airport (ISP) on schedule, select a flight that leaves Portsmouth Intl. Airport (PSM) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP) last-minute?
Waiting until just before your departure to book a flight from PSM to ISP generally means paying more. While you may come across some last-minute deals, they aren't always guaranteed. Be flexible with your travel plans to maximize your chances of landing a bargain.
Is it cheaper to book a PSM to ISP flight and hotel package?
You'll typically save money by booking a PSM to ISP flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After selecting your preferred accommodations and flights, you can add extras like activities, car rentals and tours.
Can I cancel or change the date of my flight from Portsmouth Intl. Airport (PSM) to MacArthur Airport (ISP)?
It's generally possible to reschedule or cancel your PSM to ISP flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.