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.

$196+ Flights from Philadelphia to Islip, NY

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Cheap flight deals from Philadelphia to Islip

Cheapest

Best

Last-minute

One-way

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 23, 2026.

Fri 6/54:00 pm

PHL

ISP

1 stop17h 08m

Multiple Airlines

Sun 6/710:03 am

ISP

PHL

1 stop10h 08m

Multiple Airlines

Deal found 2/21

$329

Thu 4/95:00 am

PHL

ISP

1 stop10h 10m

Multiple Airlines

Sun 4/127:59 pm

ISP

PHL

2 stops29h 03m

Multiple Airlines

Deal found 2/23

$399

Mon 3/95:30 am

PHL

ISP

1 stop8h 01m

Multiple Airlines

Fri 3/138:45 pm

ISP

PHL

2 stops28h 14m

Multiple Airlines

Deal found 2/22

$450

Tue 2/244:09 pm

PHL

ISP

2 stops50h 37m

Multiple Airlines

Tue 3/311:59 am

ISP

PHL

1 stop11h 01m

Multiple Airlines

Deal found 2/23

$785

Find flight deals from Philadelphia to Islip

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$329 (Kiwi.com)
One-way from	$196 (Kiwi.com)
Popular in	February
Cheapest in	August
Average price	$681

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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One-way flight from Philadelphia to Islip Long Island

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Highest demand for flights based on searches. 11% potential increase in price ($42 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 10% potential price decrease ($32 potential savings vs. average RT price).

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Average for round-trip flights in February 2026

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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 6/5

4:00 pm-9:08 am

1 stop17h 08m

Islip Long Island

Sun 6/7

10:03 am-8:11 pm

1 stop10h 08m

$329

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Thu 4/9

5:00 am-3:10 pm

1 stop10h 10m

Islip Long Island

Sun 4/12

7:59 pm-1:02 am

2 stops29h 03m

$399

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Mon 3/9

5:30 am-1:31 pm

1 stop8h 01m

Islip Long Island

Fri 3/13

8:45 pm-12:59 am

2 stops28h 14m

$450

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Sun 3/8

7:46 pm-12:33 pm

1 stop16h 47m

$196

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/22

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.

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.

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$196+ 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 3/8. 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 23, 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 23, 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 23, 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 23, 2026.

Last-minute flights from Philadelphia to IslipDiscover last-minute flight deals from Philadelphia to Islip. Data last updated February 23, 2026 and is based on user searches.

Discover last-minute flight deals from Philadelphia to Islip. Data last updated February 23, 2026 and is based on user searches.

One-way flights from Philadelphia to IslipSearch for one-way flight options from Philadelphia to Islip. Find affordable one-way fares based on user searches. Data last updated February 23, 2026.

Search for one-way flight options from Philadelphia to Islip. Find affordable one-way fares based on user searches. Data last updated February 23, 2026.

Find flight deals from Philadelphia to Islip

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

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Cheapflights Fare Finder

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.

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?

Traveling to a place near Islip?

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Alternative routes for Philadelphia to Islip

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Islip by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Philadelphia to Islip by cabin class

Find flights from Philadelphia to Islip, based on your preferred cabin class, be it economy, premium economy, business, or first class.

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 23, 2026.

Philadelphia and Islip flights

Browse other Philadelphia and Islip flight options. Last updated on February 23, 2026.

Other flights from Philadelphia

Browse through other flights departing from Philadelphia. Flights are based on user searches made on Cheapflights and were last updated on February 23, 2026.

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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 23, 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 23, 2026.

Last-minute flights from Philadelphia to Islip
Discover last-minute flight deals from Philadelphia to Islip. Data last updated February 23, 2026 and is based on user searches.

One-way flights from Philadelphia to Islip
Search for one-way flight options from Philadelphia to Islip. Find affordable one-way fares based on user searches. Data last updated February 23, 2026.