HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$177+ Cheap flights from Philadelphia to Islip, NY (PHL - ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Jan 24 — Jan 311
Sat 1/24
Sat 1/31
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia 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 Philadelphia to Islip

Best flights from Philadelphia to Islip
Discover carefully curated flight deals from Philadelphia to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 25, 2025.

This Trip.com deal was found by Cheapflights users on 12/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/93:56 pmPHL - ISP
1 stop27h 12mFrontier
Tue 1/138:00 amISP - PHL
1 stop9h 43mFrontier
Deal found 12/25$177
This Kiwi.com deal was found by Cheapflights users on 12/25. 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 1/1812:16 pmPHL - ISP
1 stop11h 43mMultiple Airlines
Sun 1/259:25 amISP - PHL
2 stops15h 00mMultiple Airlines
Deal found 12/25$248
This Kiwi.com deal was found by Cheapflights users on 12/25. 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 1/1812:16 pmPHL - ISP
1 stop11h 43mFrontier
Sun 1/257:53 pmISP - PHL
1 stop14h 33mFrontier
Deal found 12/25$223

Find flight deals from Philadelphia to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Islip (ISP). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 25, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$177
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$554
Provider with most accurate pricing for Philadelphia-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Islip Long Island flights.
Search Deals
From Philadelphia to Islip Long Island
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($102 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia 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 December 25, 2025.
Use the filters below to find and compare flights from Philadelphia to Islip that are best for you.

Fly from

Philadelphia

Fly to

Islip

Route

Depart

Return

Price

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 1/9

3:56 pm-7:08 pm

1 stop27h 12m

Islip Long Island

Tue 1/13

8:00 am-5:43 pm

1 stop9h 43m

$177

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Sun 1/18

12:16 pm-11:59 pm

1 stop11h 43m

Islip Long Island

Sun 1/25

7:53 pm-10:26 am

1 stop14h 33m

$223

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Sun 1/18

12:16 pm-11:59 pm

1 stop11h 43m

Islip Long Island

Sun 1/25

9:25 am-12:25 am

2 stops15h 00m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

Compare providers for flights from Philadelphia to Islip

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Islip in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Philadelphia-Islip, New York flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Philadelphia-Islip, New York flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Philadelphia-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Islip, New York flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Philadelphia to Islip

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

What is the cheapest month to book a flight from Philadelphia to Islip, New York?

Currently, May is the cheapest month in which you can book a flight from Philadelphia to Islip, New York (average of $155). Flying from Philadelphia to Islip, New York in October is currently the most expensive (average of $496). 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 Philadelphia to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Philadelphia to Islip, New York?

    For as low as $177, Frontier can have you in Islip, New York from Philadelphia in 27h 12m. Airlines will cover a distance of 129 mi.

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

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

  • How can I find direct flights from Philadelphia to Islip?

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

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

    Yes. Cheapflights offers flight deals from Philadelphia 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 Philadelphia to Islip, New York?

    Currently, May is the cheapest month in which you can book a flight from Philadelphia to Islip, New York (average of $155). Flying from Philadelphia to Islip, New York in October is currently the most expensive (average of $496). 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

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 Philadelphia to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Reagan-National to LaGuardia flights
Pittsburgh to John F Kennedy Intl flights
Pittsburgh to Newark flights
John F Kennedy Intl to Buffalo flights
Dulles Intl to John F Kennedy Intl flights
Pittsburgh to LaGuardia flights
Reagan-National to John F Kennedy Intl flights
Newark to Buffalo flights
Dulles Intl to Newark flights
LaGuardia to Buffalo flights
Reagan-National to Newark flights
Dulles Intl to LaGuardia flights
John F Kennedy Intl to Rochester flights
Philadelphia to Buffalo flights
Newark to Rochester flights
LaGuardia to Rochester flights
LaGuardia to Syracuse flights
Dulles Intl to Buffalo flights
Newark to Syracuse flights
John F Kennedy Intl to Syracuse flights
Reagan-National to Buffalo flights
Reagan-National to Syracuse flights
Dulles Intl to Syracuse flights
Reagan-National to Albany flights
Philadelphia to John F Kennedy Intl flights
Philadelphia to Rochester flights
Dulles Intl to Albany flights
Reagan-National to Saranac Lake flights
Philadelphia to Newark flights
Philadelphia to LaGuardia flights
Dulles Intl to Rochester flights
John F Kennedy Intl to Ithaca flights
Reagan-National to Rochester flights
Dulles Intl to Ithaca flights
Reagan-National to White Plains flights
John F Kennedy Intl to Albany flights
Philadelphia to Syracuse flights
Pittsburgh to Stewart flights
Philadelphia to Albany flights
LaGuardia to Ithaca flights
Newark to Albany flights
Reagan-National to Ithaca flights
Philadelphia to Stewart flights
Pittsburgh to Syracuse flights
Pittsburgh to White Plains flights
Dulles Intl to White Plains flights
Newark to Ithaca flights
Dulles Intl to Plattsburgh flights
Pittsburgh to Albany flights
Allentown to Buffalo flights

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.