What is the cheapest month to fly from Islip, New York to Philadelphia?

The best pricing can be found in the month of September. Prices to Philadelphia from Islip, New York average $290. You can even find prices in September for less than $290, as users have found deals to Philadelphia from as low as $140. The month of February appears to be one of the more expensive times to travel to Philadelphia from Islip, New York. Flying in the targeted month can save you up to 43%.

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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Philadelphia flight deals on Cheapflights vs. FlightHub >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.

$145+ Flights from Islip, NY to Philadelphia

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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.

Cheap flight deals from Islip to Philadelphia

Most accurate provider	FlightHub 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$318 (JetBlue)
One-way from	$145 (Trip.com)
Popular in	February
Cheapest in	September
Average price	$390

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. 16% potential increase in price ($56 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

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 April 22, 2025.

Tue 5/66:00 amISP - PHL

1 stop3h 38mJetBlue

Sat 5/106:09 pmPHL - ISP

1 stop3h 19mJetBlue

Deal found 4/21

$318

Mon 5/510:44 amISP - PHL

2 stops21h 26mMultiple Airlines

Fri 5/96:00 amPHL - ISP

3 stops31h 45mMultiple Airlines

Deal found 4/20

$493

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 April 22, 2025.

Tue 5/66:00 amISP - PHL

1 stop3h 38mJetBlue

Sat 5/106:09 pmPHL - ISP

1 stop3h 19mJetBlue

Deal found 4/21

$318

Mon 5/510:44 amISP - PHL

2 stops21h 26mMultiple Airlines

Fri 5/96:00 amPHL - ISP

3 stops31h 45mMultiple Airlines

Deal found 4/20

$493

Last-minute flights from Islip to Philadelphia
Discover last-minute flight deals from Islip to Philadelphia. Data last updated April 22, 2025 and is based on user searches.

Fri 5/26:00 amISP - PHL

1 stop3h 41mJetBlue

Sun 5/45:30 pmPHL - ISP

1 stop3h 58mJetBlue

Deal found 4/21

$670

Fri 5/23:59 pmISP - PHL

2 stops17h 12mMultiple Airlines

Sun 5/411:53 amPHL - ISP

2 stops22h 11mMultiple Airlines

Deal found 4/21

$674

Mon 5/510:44 amISP - PHL

2 stops21h 26mMultiple Airlines

Fri 5/96:00 amPHL - ISP

3 stops31h 45mMultiple Airlines

Deal found 4/20

$493

Tue 5/66:00 amISP - PHL

1 stop3h 38mJetBlue

Sat 5/106:09 pmPHL - ISP

1 stop3h 19mJetBlue

Deal found 4/21

$318

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 April 22, 2025.

Mon 5/54:23 pmISP - PHL

1 stop8h 58mFrontier

Deal found 4/20

$145

Wed 5/146:00 amISP - PHL

1 stop3h 38mJetBlue

Deal found 4/20

$167

Mon 5/510:44 amISP - PHL

2 stops21h 26mMultiple Airlines

Deal found 4/20

$196

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

Tue 5/6

6:00 am-9:38 am

1 stop3h 38m

Philadelphia

Sat 5/10

6:09 pm-9:28 pm

1 stop3h 19m

$318

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 5/5

10:44 am-8:10 am

2 stops21h 26m

Philadelphia

Fri 5/9

6:00 am-1:45 pm

3 stops31h 45m

$493

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 5/5

4:23 pm-1:21 am

1 stop8h 58m

$145

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 5/14

6:00 am-9:38 am

1 stop3h 38m

$167

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 5/5

10:44 am-8:10 am

2 stops21h 26m

$196

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/20

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 April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Philadelphia flight deals on Cheapflights vs. FlightHub >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, August is the cheapest month in which you can book a flight from Islip, New York to Philadelphia (average of $236). Flying from Islip, New York to Philadelphia in March is currently the most expensive (average of $295). 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.

Rainfall in Philadelphia by month

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.

Temperature in Philadelphia by month

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).

Reviews of airlines servicing Philadelphia

JetBlue

7.3

Good

2,923 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Feb 2025

JFK - CHS

Boarding took a very long time, in fact we were delayed by at least 30mins. There wasn’t many options for snacks and there was only water. The pilot did an excellent job

JetBlue

7.3

Good

2,923 reviews

JetBlue

7.3

Good

2,923 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Feb 2025

JFK - CHS

Boarding took a very long time, in fact we were delayed by at least 30mins. There wasn’t many options for snacks and there was only water. The pilot did an excellent job

Frontier

6.0

Okay

3,283 reviews

JetBlue

7.3

Good

2,923 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Feb 2025

JFK - CHS

Boarding took a very long time, in fact we were delayed by at least 30mins. There wasn’t many options for snacks and there was only water. The pilot did an excellent job

Related info for your journey

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, August is the cheapest month in which you can book a flight from Islip, New York to Philadelphia (average of $236). Flying from Islip, New York to Philadelphia in March is currently the most expensive (average of $295). 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

Vineland

Pottstown

Wildwood

King of Prussia

Reading

Cherry Hill

Exton

Ocean City

Essington

Chester

Middletown

Willow Grove

Newark

Millville

Ephrata

Camden

Dewey Beach

West Chester

Malvern

Dover

Browse thousands of different options on Cheapflights for your next trip

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.

$145+ 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 5/5. 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

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 April 22, 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 April 22, 2025.

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 April.

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?

Rainfall in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average rainfall totals by month.

Temperature in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average temperature totals by month.

Reviews of airlines servicing 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.

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?

Traveling to a place near Islip?

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.

100% Free

Book with Flexibility

Travel Smart

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 April 22, 2025.