HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Philadelphia

$91+ Cheap flights from Islip, NY to Philadelphia (ISP - PHL)

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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Dec 12 — Dec 191
Fri 12/12
Fri 12/19
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Philadelphia 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.

Find flight deals from Islip to Philadelphia

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

This Kiwi.com deal was found by Cheapflights users on 11/9. 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.
Tue 12/232:19 pmISP - PHL
2 stops30h 06mMultiple Airlines
Mon 12/295:25 amPHL - ISP
1 stop7h 44mMultiple Airlines
Deal found 11/9$314
This Trip.com deal was found by Cheapflights users on 11/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/144:58 pmISP - PHL
1 stop8h 26mFrontier
Sun 11/168:40 amPHL - ISP
1 stop12h 02mFrontier
Deal found 11/10$362
This Trip.com deal was found by Cheapflights users on 11/9. 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.
Tue 12/2312:20 pmISP - PHL
1 stop12h 28mFrontier
Mon 12/2910:00 pmPHL - ISP
1 stop13h 25mFrontier
Deal found 11/9$401
This Kiwi.com deal was found by Cheapflights users on 11/10. 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.
Fri 11/144:58 pmISP - PHL
1 stop8h 26mMultiple Airlines
Sun 11/1610:32 pmPHL - ISP
2 stops15h 13mMultiple Airlines
Deal found 11/10$423
This Kiwi.com deal was found by Cheapflights users on 11/10. 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.
Tue 11/256:00 amISP - PHL
2 stops23h 32mFrontier
Sat 11/2910:20 pmPHL - ISP
1 stop11h 49mFrontier
Deal found 11/10$471
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 11/139:54 amISP - PHL
1 stop8h 01mFrontier
Thu 11/1310:32 pmPHL - ISP
1 stop12h 05mFrontier
Deal found 11/10$626

Cheap flight deals from Islip to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Philadelphia (PHL). 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 November 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$314
(Kiwi.com)

One-way from

$91
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$510
Provider with most accurate pricing for Islip Long Island-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-Philadelphia flights.
Search Deals
From Islip Long Island to Philadelphia
Search Deals
One-way flight from Islip Long Island to Philadelphia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($64 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Philadelphia 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 November 12, 2025.
Use the filters below to find and compare flights from Islip to Philadelphia that are best for you.

Fly from

Islip

Fly to

Philadelphia

Route

Depart

Return

Price

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/23

2:19 pm-8:25 pm

2 stops30h 06m

Philadelphia

Mon 12/29

5:25 am-1:09 pm

1 stop7h 44m

$314

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/23

12:20 pm-12:48 am

1 stop12h 28m

Philadelphia

Mon 12/29

10:00 pm-11:25 am

1 stop13h 25m

$401

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 11/25

6:00 am-5:32 am

2 stops23h 32m

Philadelphia

Sat 11/29

10:20 pm-10:09 am

1 stop11h 49m

$471

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 11/25

10:21 am-3:17 pm

3 stops28h 56m

Philadelphia

Sat 11/29

6:15 am-7:45 pm

2 stops13h 30m

$1,265

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 11/17

9:54 am-5:55 pm

1 stop8h 01m

$91

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 11/25

11:40 am-4:20 pm

3 stops28h 40m

$145

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 11/25

11:03 am-12:39 am

1 stop13h 36m

$148

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sun 11/23

8:25 pm-7:32 am

1 stop11h 07m

$153

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sun 11/23

11:40 am-11:23 am

3 stops23h 43m

$169

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 11/17

8:47 pm-9:12 am

3 stops36h 25m

$204

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

Showing 1-10 of 13 results
1
2

Compare providers for flights from Islip to Philadelphia

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 Islip to Philadelphia in November.
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 Islip, New York-Philadelphia flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Philadelphia flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-Philadelphia 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 Islip, New York-Philadelphia 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 Islip to Philadelphia

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

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

Currently, April is the cheapest month in which you can book a flight from Islip, New York to Philadelphia (average of $114). Flying from Islip, New York to Philadelphia in February is currently the most expensive (average of $331). 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 Islip to Philadelphia. 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 Islip, New York to Philadelphia?

    For as low as $401, Frontier can have you in Philadelphia from Islip, New York in 12h 28m. The distance between Islip, New York and Philadelphia is about 129 mi.

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

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

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

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

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

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

    Currently, April is the cheapest month in which you can book a flight from Islip, New York to Philadelphia (average of $114). Flying from Islip, New York to Philadelphia in February is currently the most expensive (average of $331). 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 Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
King of Prussia
Pottstown
Reading
Ocean City
Cherry Hill
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Newark
Millville
Chester
Exton

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 Islip to Philadelphia

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