$163 Cheap Flights from Islip (ISP) to Philadelphia (PHL)

View $163 flight on Tue, Jun 3, 2025Opens in a new window

Popular airlines from MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL)

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Find available prices by choosing your travel dates.

Cheap Flights from Islip to Philadelphia (ISP-PHL)

Prices were available within the past 7 days and start at $163 for one-way flights and $293 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

JetBlue Airways
Wed, May 14 - Sat, May 24
ISP
Islip
PHL
Philadelphia
$293 Roundtrip, found 2 hours ago
$293
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Wed, May 14 from Islip to Philadelphia, returning Sat, May 24, priced at $293 found 2 hours ago
JetBlue Airways
Sat, May 31 - Mon, Jun 16
ISP
Islip
PHL
Philadelphia
$308 Roundtrip, found 2 hours ago
$308
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Sat, May 31 from Islip to Philadelphia, returning Mon, Jun 16, priced at $308 found 2 hours ago
JetBlue Airways
Sat, Jun 7 - Wed, Jun 25
ISP
Islip
PHL
Philadelphia
$314 Roundtrip, found 2 hours ago
$314
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Sat, Jun 7 from Islip to Philadelphia, returning Wed, Jun 25, priced at $314 found 2 hours ago
JetBlue Airways
Wed, May 14 - Thu, May 29
ISP
Islip
PHL
Philadelphia
$318 Roundtrip, found 2 hours ago
$318
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Wed, May 14 from Islip to Philadelphia, returning Thu, May 29, priced at $318 found 2 hours ago
JetBlue Airways
Thu, Jun 12 - Thu, Jul 3
ISP
Islip
PHL
Philadelphia
$323 Roundtrip, found 2 hours ago
$323
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Thu, Jun 12 from Islip to Philadelphia, returning Thu, Jul 3, priced at $323 found 2 hours ago
JetBlue Airways
Thu, Jun 12 - Tue, Jul 1
ISP
Islip
PHL
Philadelphia
$329 Roundtrip, found 2 hours ago
$329
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Thu, Jun 12 from Islip to Philadelphia, returning Tue, Jul 1, priced at $329 found 2 hours ago
JetBlue Airways
Thu, Jun 12 - Wed, Jul 2
ISP
Islip
PHL
Philadelphia
$333 Roundtrip, found 2 hours ago
$333
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Thu, Jun 12 from Islip to Philadelphia, returning Wed, Jul 2, priced at $333 found 2 hours ago
JetBlue Airways
Tue, Jun 17 - Tue, Jul 1
ISP
Islip
PHL
Philadelphia
$335 Roundtrip, found 2 hours ago
$335
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Tue, Jun 17 from Islip to Philadelphia, returning Tue, Jul 1, priced at $335 found 2 hours ago
JetBlue Airways
Sun, Jun 15 - Tue, Jul 1
ISP
Islip
PHL
Philadelphia
$339 Roundtrip, found 2 hours ago
$339
Roundtrip
found 2 hours ago
Select JetBlue Airways flight, departing Sun, Jun 15 from Islip to Philadelphia, returning Tue, Jul 1, priced at $339 found 2 hours ago
Southwest Airlines
Sat, May 17 - Tue, May 20
ISP
Islip
PHL
Philadelphia
$363 Roundtrip, found 2 days ago
$363
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Sat, May 17 from Islip to Philadelphia, returning Tue, May 20, priced at $363 found 2 days ago
Flights from Islip (ISP) to Philadelphia (PHL)
Origin airport
MacArthur
Destination airport
Philadelphia Intl.
Airlines serving
JetBlue Airways, Southwest Airlines
Roundtrip price
$293
Distance
129 mi

Islip to Philadelphia Flights

The cheapest times to fly from Islip to Philadelphia

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 Islip to Philadelphia are during the month of May. You can find some of the cheapest flights from Islip to Philadelphia with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Islip to Philadelphia

Sunday is one of the best days to book for cheap flights from Islip to Philadelphia: 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 Islip to Philadelphia

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 Islip to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $163 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 Islip to Philadelphia 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 Islip to Philadelphia 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 MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL) cost?
Discover the latest flight deals from ISP to PHL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from ISP to PHL?
The cheapest flights from ISP to PHL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from ISP to PHL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from ISP to PHL. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL)?
There aren’t any daily nonstop flights available from MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL). But you can opt for flights with layovers. Filter your search results on Expedia to include one or more stops, and you’ll be soaring above the clouds in no time.
What day of the week has the most flights from ISP to PHL?
You’ll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from ISP to PHL?
Consider booking with American Airlines if you’d like to go straight from MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL) without any interruptions. This carrier has the best track record for punctuality, with an on-time performance of 88%. Want to be notified if anything changes? You can check your flight status using the Expedia App.
What is the best time to fly from MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL)?
To reach Philadelphia Intl. Airport (PHL) without delays, choose a flight that leaves from MacArthur Airport (ISP) before 3 PM. The likelihood 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 MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL) last-minute?
Holding off until just before your trip to book a ticket from ISP to PHL generally means paying more. While it’s possible to find some last-minute discounts, they’re not always guaranteed. Be flexible with your travel plans for a better chance of getting a bargain.
Is it cheaper to book an ISP to PHL flight and hotel package?
You’ll typically save money by booking an ISP to PHL 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 it all in one convenient place. After selecting your preferred flights and accommodations, you can add extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from MacArthur Airport (ISP) to Philadelphia Intl. Airport (PHL)?
If you reserved your ISP to PHL flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for further details.

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*Available to One Key members.