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

For as low as $185, Frontier can have you in Philadelphia from Islip, New York in 12h 41m. The distance between Islip, New York and Philadelphia is about 129 mi.

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

What is the cheapest time of day to fly from ISP to PHL?

When flying from Islip, New York to Philadelphia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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.

$163+ Flights from Islip, NY to Philadelphia

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1. Tell us where you want to go

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Cheap 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 December 28, 2025.

Fri 12/262:25 pmISP - PHL

1 stop8h 50mMultiple Airlines

Wed 12/3110:00 pmPHL - ISP

1 stop13h 25mMultiple Airlines

Deal found 12/25

$640

Tue 12/3012:20 pmISP - PHL

1 stop11h 36mMultiple Airlines

Thu 1/17:18 pmPHL - ISP

1 stop18h 27mMultiple Airlines

Deal found 12/26

$641

Mon 12/298:35 pmISP - PHL

1 stop12h 02mFrontier

Tue 12/3010:00 pmPHL - ISP

1 stop18h 37mFrontier

Deal found 12/25

$656

Mon 12/292:25 pmISP - PHL

2 stops18h 12mMultiple Airlines

Tue 12/3010:00 pmPHL - ISP

1 stop18h 37mMultiple Airlines

Deal found 12/25

$673

Best flights from Islip to Philadelphia
Discover carefully curated flight deals from Islip to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 28, 2025.

Mon 1/267:43 pmISP - PHL

1 stop19h 01mMultiple Airlines

Mon 2/25:17 pmPHL - ISP

1 stop18h 42mMultiple Airlines

Deal found 12/27

$163

Sat 1/107:56 pmISP - PHL

1 stop12h 41mFrontier

Wed 1/142:00 pmPHL - ISP

1 stop8h 46mFrontier

Deal found 12/26

$185

Fri 1/237:33 pmISP - PHL

1 stop19h 13mMultiple Airlines

Fri 1/305:39 pmPHL - ISP

2 stops17h 31mMultiple Airlines

Deal found 12/26

$174

Sat 1/107:56 pmISP - PHL

2 stops36h 51mMultiple Airlines

Wed 1/142:00 pmPHL - ISP

1 stop8h 46mMultiple Airlines

Deal found 12/26

$178

Thu 3/53:34 pmISP - PHL

1 stop16h 02mMultiple Airlines

Sat 3/76:11 pmPHL - ISP

2 stops16h 04mMultiple Airlines

Deal found 12/26

$210

Thu 3/53:34 pmISP - PHL

1 stop16h 02mFrontier

Sat 3/710:38 pmPHL - ISP

1 stop16h 45mFrontier

Deal found 12/26

$255

Last-minute flights from Islip to Philadelphia
Discover last-minute flight deals from Islip to Philadelphia. Data last updated December 28, 2025 and is based on user searches.

Fri 12/262:25 pmISP - PHL

1 stop8h 50mMultiple Airlines

Wed 12/3110:00 pmPHL - ISP

1 stop13h 25mMultiple Airlines

Deal found 12/25

$640

Tue 12/3012:20 pmISP - PHL

1 stop11h 36mMultiple Airlines

Thu 1/17:18 pmPHL - ISP

1 stop18h 27mMultiple Airlines

Deal found 12/26

$641

Fri 1/22:25 pmISP - PHL

1 stop8h 50mMultiple Airlines

Wed 1/76:49 pmPHL - ISP

1 stop24h 56mMultiple Airlines

Deal found 12/25

$326

Fri 1/26:00 amISP - PHL

2 stops18h 41mFrontier

Wed 1/76:49 pmPHL - ISP

1 stop24h 56mFrontier

Deal found 12/25

$328

Sat 1/107:56 pmISP - PHL

2 stops36h 51mMultiple Airlines

Wed 1/142:00 pmPHL - ISP

1 stop8h 46mMultiple Airlines

Deal found 12/26

$178

Sat 1/107:56 pmISP - PHL

1 stop12h 41mFrontier

Wed 1/142:00 pmPHL - ISP

1 stop8h 46mFrontier

Deal found 12/26

$185

Fri 1/237:33 pmISP - PHL

1 stop19h 13mMultiple Airlines

Fri 1/305:39 pmPHL - ISP

2 stops17h 31mMultiple Airlines

Deal found 12/26

$174

Mon 1/267:43 pmISP - PHL

1 stop19h 01mMultiple Airlines

Mon 2/25:17 pmPHL - ISP

1 stop18h 42mMultiple Airlines

Deal found 12/27

$163

One-way flights from Islip to Philadelphia
Search for one-way flight options from Islip to Philadelphia. Find affordable one-way fares based on user searches. Data last updated December 28, 2025.

Sat 6/1312:35 pmISP - PHL

1 stop10h 26mJetBlue

Deal found 12/25

$1,112

Find flight deals from Islip to Philadelphia

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$163 (Kiwi.com)
Popular in	July
Cheapest in	March

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

Highest demand for flights based on searches. 7% potential increase in price ($37 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease ($27 potential savings vs. average RT price).

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Islip to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 1/26

7:43 pm-2:44 pm

1 stop19h 01m

Philadelphia

Mon 2/2

5:17 pm-11:59 am

1 stop18h 42m

$163

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 1/23

7:33 pm-2:46 pm

1 stop19h 13m

Philadelphia

Fri 1/30

5:39 pm-11:10 am

2 stops17h 31m

$174

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 1/10

7:56 pm-8:47 am

2 stops36h 51m

Philadelphia

Wed 1/14

2:00 pm-10:46 pm

1 stop8h 46m

$178

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 1/10

7:56 pm-8:37 am

1 stop12h 41m

Philadelphia

Wed 1/14

2:00 pm-10:46 pm

1 stop8h 46m

$185

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 3/5

3:34 pm-7:36 am

1 stop16h 02m

Philadelphia

Sat 3/7

6:11 pm-10:15 am

2 stops16h 04m

$210

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 3/5

3:34 pm-7:36 am

1 stop16h 02m

Philadelphia

Sat 3/7

10:38 pm-3:23 pm

1 stop16h 45m

$255

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 6/13

12:35 pm-11:01 pm

1 stop10h 26m

$1,112

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

Compare providers for flights from Islip to Philadelphia

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Philadelphia in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust 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 $403). 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

How long is the flight from Islip, New York to Philadelphia?
For as low as $185, Frontier can have you in Philadelphia from Islip, New York in 12h 41m. 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 $403). 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

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$163+ Cheap flights from Islip, NY to Philadelphia (ISP - PHL)

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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Philadelphia with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to Philadelphia

Cheapest flights from Islip to PhiladelphiaExplore 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 December 28, 2025.

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 December 28, 2025.

Find flight deals from Islip to Philadelphia

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Cheapflights Fare Finder

Use the filters below to find and compare flights from Islip to Philadelphia that are best for you.

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 December.

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.

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?

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?

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

How can I find direct flights from Islip to Philadelphia?

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

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

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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 December 28, 2025.