In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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

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.

Most accurate provider : When it comes to deals on Philadelphia-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Islip, New York flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

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.

$418+ Flights from Philadelphia to Islip, NY

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Cheap flight deals from Philadelphia to Islip

Cheapest

Best

Last-minute

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 February 3, 2026.

Fri 2/137:30 am

PHL

ISP

1 stop6h 01m

Multiple Airlines

Sun 2/158:01 pm

ISP

PHL

2 stops19h 46m

Multiple Airlines

Deal found 2/3

$418

Find flight deals from Philadelphia to Islip

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$418 (Kiwi.com)
Popular in	November
Cheapest in	August
Average price	$408

Provider with most accurate pricing for Philadelphia-Islip Long Island flight deals.

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Provider most trusted by Cheapflights users for Philadelphia-Islip Long Island flights.

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From Philadelphia to Islip Long Island

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Highest demand for flights based on searches. 11% potential increase in price ($41 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($16 potential savings vs. average RT price).

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Average for round-trip flights in February 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 2/13

7:30 am-1:31 pm

1 stop6h 01m

Islip Long Island

Sun 2/15

8:01 pm-3:47 pm

2 stops19h 46m

$418

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Compare providers for flights from Philadelphia to Islip

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

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	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 Philadelphia-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Islip, New York flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

PHL-ISP

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

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.

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$418+ 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 2/13. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Philadelphia to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Philadelphia to Islip

Cheapest flights from Philadelphia to IslipExplore 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 February 3, 2026.

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 February 3, 2026.

Best flights from Philadelphia to IslipDiscover 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 February 3, 2026.

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 February 3, 2026.

Last-minute flights from Philadelphia to IslipDiscover last-minute flight deals from Philadelphia to Islip. Data last updated February 3, 2026 and is based on user searches.

Discover last-minute flight deals from Philadelphia to Islip. Data last updated February 3, 2026 and is based on user searches.

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

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 February.

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.

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?

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.

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

How can I find direct flights from Philadelphia to Islip?

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

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

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Other flights to Islip

Explore flights to Islip departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 3, 2026.

Philadelphia and Islip flights

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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 February 3, 2026.

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 February 3, 2026.

Last-minute flights from Philadelphia to Islip
Discover last-minute flight deals from Philadelphia to Islip. Data last updated February 3, 2026 and is based on user searches.