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$146+ Cheap flights from Philadelphia to Islip, NY (PHL - ISP)

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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap 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 July 29, 2025.

Round-trip from

$377
(Trip.com)

One-way from

$146
(Trip.com)

Popular in

November

Cheapest in

August

Average price

$296
From Philadelphia to Islip Long Island
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One-way flight from Philadelphia to Islip Long Island
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Highest demand for flights based on searches. 15% potential increase in price ($64 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 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 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 July 29, 2025.

This Trip.com deal was found by Cheapflights users on 7/27. 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.
Sun 8/2411:51 amPHL - ISP
1 stop8h 15mFrontier
Sun 8/311:04 pmISP - PHL
1 stop9h 24mFrontier
Deal found 7/27$377
This Trip.com deal was found by Cheapflights users on 7/27. 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 8/222:06 pmPHL - ISP
2 stops9h 51mMultiple Airlines
Mon 8/256:45 amISP - PHL
1 stop8h 11mMultiple Airlines
Deal found 7/27$491

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 July 29, 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

Sun 8/24

11:51 am-8:06 pm

1 stop8h 15m

Islip Long Island

Sun 8/31

1:04 pm-10:28 pm

1 stop9h 24m

$377

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 8/22

2:06 pm-11:57 pm

2 stops9h 51m

Islip Long Island

Mon 8/25

6:45 am-2:56 pm

1 stop8h 11m

$491

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Mon 8/25

10:47 am-11:57 pm

1 stop13h 10m

$146

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

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 time of day to fly from PHL to ISP?

Find hourly flight availability from Philadelphia to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to Islip, New York as you normally would.

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated July 29, 2025.
Read through reviews of airlines operating flights from Philadelphia to Islip, such as Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Frontier
5.9
Fair
3,238 reviews

Food

4.7

Comfort

5.6

Overall

5.9

Crew

6.7

Boarding

6.1

Entertainment

4.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

TTN - TPA

TTN is a small airport for Frontier. Drop off is easy as is parking. The location is remote so there is zero traffic. The place could use a renovation but for the price you pay it is not necessary. Good-Staff is very friendly. Flight left on time. Bad- run down, deplaning/boarding on the tarmac. I got wet on the stairs outside of the plane while waiting to board.
Frontier
5.9
Fair
3,238 reviews
Frontier
5.9
Fair
3,238 reviews

Food

4.7

Comfort

5.6

Overall

5.9

Crew

6.7

Boarding

6.1

Entertainment

4.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

TTN - TPA

TTN is a small airport for Frontier. Drop off is easy as is parking. The location is remote so there is zero traffic. The place could use a renovation but for the price you pay it is not necessary. Good-Staff is very friendly. Flight left on time. Bad- run down, deplaning/boarding on the tarmac. I got wet on the stairs outside of the plane while waiting to board.

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.

  • What is the cheapest airline to fly from Philadelphia to Islip, New York round-trip?

    Currently priced at $377, Frontier will fly you from Philadelphia to Islip, New York and back. In addition to Frontier, many other airlines offer competitively priced options for your trip.

  • 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, January is the cheapest month in which you can book a flight from Philadelphia to Islip, New York (average of $108). Flying from Philadelphia to Islip, New York in November is currently the most expensive (average of $213). 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?

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Riverhead
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