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$169+ 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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap flight deals from Philadelphia to Islip

Cheapest flights from Philadelphia to Islip
Explore the most affordable flight options available from Philadelphia to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/10. 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.
Thu 12/256:00 amPHL - ISP
2 stops31h 09mMultiple Airlines
Mon 12/292:04 pmISP - PHL
1 stop10h 36mMultiple Airlines
Deal found 12/10$521
This Kiwi.com deal was found by Cheapflights users on 12/11. 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.
Wed 12/2410:00 pmPHL - ISP
1 stop13h 25mMultiple Airlines
Thu 12/254:40 pmISP - PHL
1 stop16h 27mMultiple Airlines
Deal found 12/11$549
This Kiwi.com deal was found by Cheapflights users on 12/10. 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.
Thu 12/2511:41 amPHL - ISP
1 stop27h 39mFrontier
Mon 12/292:04 pmISP - PHL
1 stop10h 36mFrontier
Deal found 12/10$612

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 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$169
(Kiwi.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 12, 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 2/6

6:45 am-6:38 pm

1 stop11h 53m

Islip Long Island

Sun 2/8

7:53 pm-10:26 am

1 stop14h 33m

$169

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Thu 12/25

6:00 am-1:09 pm

2 stops31h 09m

Islip Long Island

Mon 12/29

2:04 pm-12:40 am

1 stop10h 36m

$521

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Wed 12/24

10:00 pm-11:25 am

1 stop13h 25m

Islip Long Island

Thu 12/25

4:40 pm-9:07 am

1 stop16h 27m

$549

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Thu 12/25

11:41 am-3:20 pm

1 stop27h 39m

Islip Long Island

Mon 12/29

2:04 pm-12:40 am

1 stop10h 36m

$612

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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 $169, Frontier can have you in Islip, New York from Philadelphia in 11h 53m. 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

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