What is the cheapest airline that flies from Islip Long Island to Philadelphia?

JetBlue is the most popular carrier operating from Islip Long Island to Philadelphia

When did momondo last update prices for flights from Islip Long Island Airport to Philadelphia Airport?

Prices for flights from Islip Long Island Airport to Philadelphia Airport are updated daily.

How old do you have to be to fly from Islip Long Island Airport to Philadelphia Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Philadelphia Airport.

What documentation or ID do you need to fly to Philadelphia Airport?

The required travel and health documents for your Philadelphia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Philadelphia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$174 Cheap Flights from Islip to Philadelphia in 2025/26

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0 bags

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Find the cheapest flights from Islip, New York to Philadelphia

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Enter your travel dates to find the best prices.

7:33 pm - 2:46 pm

ISP

PHL

19h 13m1 stop

5:39 pm - 11:10 am

PHL

ISP

17h 31m2 stops

$174Multiple Airlines

ven., janv. 23 - ven., janv. 30

7:56 pm - 8:47 am

ISP

PHL

36h 51m2 stops

2:00 pm - 10:46 pm

PHL

ISP

8h 46m1 stop

$178Multiple Airlines

sam., janv. 10 - mer., janv. 14

7:56 pm - 8:37 am

ISP

PHL

12h 41m1 stop

2:00 pm - 10:46 pm

PHL

ISP

8h 46m1 stop

$185Frontier

sam., janv. 10 - mer., janv. 14

7:33 pm - 2:46 pm

ISP

PHL

19h 13m1 stop

5:30 am - 8:47 pm

PHL

ISP

15h 17m1 stop

$188Multiple Airlines

ven., janv. 23 - ven., janv. 30

3:34 pm - 7:36 am

ISP

PHL

16h 02m1 stop

6:11 pm - 10:15 am

PHL

ISP

16h 04m2 stops

$210Multiple Airlines

jeu., mars 5 - sam., mars 7

3:34 pm - 7:36 am

ISP

PHL

16h 02m1 stop

10:38 pm - 3:23 pm

PHL

ISP

16h 45m1 stop

$255Frontier

jeu., mars 5 - sam., mars 7

10:00 am - 8:01 pm

ISP

PHL

34h 01m2 stops

6:11 pm - 8:52 am

PHL

ISP

14h 41m2 stops

$273Multiple Airlines

ven., janv. 23 - ven., janv. 30

Frontier flights from Islip, New York to Philadelphia

Our best Frontier deals on Islip, New York to Philadelphia flight tickets

Frontier

Jan 10

ISP7:56 pmIslip Long Island

12h 41m

1 stop

PHL8:37 amPhiladelphia

Jan 14

PHL2:00 pmPhiladelphia

8h 46m

1 stop

ISP10:46 pmIslip Long Island

$185

Find similar

Frontier

Mar 5

ISP3:34 pmIslip Long Island

16h 02m

1 stop

PHL7:36 amPhiladelphia

Mar 7

PHL10:38 pmPhiladelphia

16h 45m

1 stop

ISP3:23 pmIslip Long Island

$255

Find similar

Frontier

Jan 2

ISP6:00 amIslip Long Island

18h 41m

2 stops

PHL12:41 amPhiladelphia

Jan 7

PHL6:49 pmPhiladelphia

24h 56m

1 stop

ISP7:45 pmIslip Long Island

$328

Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

ven. 1/23

7:33 pm-2:46 pm

1 stop19h 13m

Philadelphia

ven. 1/30

5:39 pm-11:10 am

2 stops17h 31m

$174

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

sam. 1/10

7:56 pm-8:47 am

2 stops36h 51m

Philadelphia

mer. 1/14

2:00 pm-10:46 pm

1 stop8h 46m

$178

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

sam. 1/10

7:56 pm-8:37 am

1 stop12h 41m

Philadelphia

mer. 1/14

2:00 pm-10:46 pm

1 stop8h 46m

$185

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

ven. 1/23

7:33 pm-2:46 pm

1 stop19h 13m

Philadelphia

ven. 1/30

5:30 am-8:47 pm

1 stop15h 17m

$188

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

jeu. 3/5

3:34 pm-7:36 am

1 stop16h 02m

Philadelphia

sam. 3/7

6:11 pm-10:15 am

2 stops16h 04m

$210

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

jeu. 3/5

3:34 pm-7:36 am

1 stop16h 02m

Philadelphia

sam. 3/7

10:38 pm-3:23 pm

1 stop16h 45m

$255

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

ven. 1/23

10:00 am-8:01 pm

2 stops34h 01m

Philadelphia

ven. 1/30

6:11 pm-8:52 am

2 stops14h 41m

$273

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

sam. 6/13

12:35 pm-11:01 pm

1 stop10h 26m

$1,112

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from Islip, New York to Philadelphia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest day to depart on your flight to Philadelphia?

The cheapest day to depart from Islip, New York to Philadelphia is on a Wednesday. Travelers who choose to depart for Philadelphia on a Wednesday will often find tickets for as low as $431. On the other hand, Sunday is the most expensive day to depart from Islip, New York because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $671.

What is the cheapest time of day to depart on your flight to Philadelphia?

According to our data, the cheapest time of day to fly to Philadelphia is at noon. momondo users have found flights departing from Islip, New York to Philadelphia at noon for as low as $316. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is in the afternoon when prices are around $623.

When to book flights from Islip, New York to Philadelphia

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Philadelphia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Islip, New York to Philadelphia (ISP to PHL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Philadelphia

Fastest flight time	11h 36m
Direct flights	None

The fastest flight from Islip, New York to Philadelphia takes 11h 36m

There are no direct flights from Islip, New York to Philadelphia. There are no popular flight routes from Islip, New York to Philadelphia.

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How far is Islip Long Island to Philadelphia by plane?
There are 115.4 mi between Islip Long Island and Philadelphia. 11h 36m is a normal flight duration for this route.
When did momondo last update prices for flights from Islip Long Island Airport to Philadelphia Airport?
Prices for flights from Islip Long Island Airport to Philadelphia Airport are updated daily.
How old do you have to be to fly from Islip Long Island Airport to Philadelphia Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Philadelphia Airport.
What documentation or ID do you need to fly to Philadelphia Airport?
The required travel and health documents for your Philadelphia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Philadelphia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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Newark

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Reading

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Dover

Lewes

Stone Harbor

Essington

Vineland

Pottstown

Elkton

Somers Point

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Philadelphia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Islip to Philadelphia for you.

Can I find flights from Islip to Philadelphia with flexible booking policies on momondo?

All flight searches from Islip to Philadelphia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to Philadelphia?

Once you have performed a search for Islip to Philadelphia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Islip to Philadelphia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Philadelphia from Islip. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.