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

Frontier and JetBlue are the most popular carriers 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.

$110 Cheap Flights from Islip to Philadelphia in 2026

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Find the cheapest flights from Islip, New York to Philadelphia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:31 pm - 5:41 pm

ISP

PHL

21h 10m

1 stop

10:11 am - 10:05 am

PHL

ISP

23h 54m

1 stop

$204Frontier

Fri, May 1 - Tue, May 5

8:31 pm - 11:02 am

ISP

PHL

14h 31m

2 stops

10:11 am - 10:05 am

PHL

ISP

23h 54m

1 stop

$238Frontier

Fri, May 1 - Tue, May 5

11:57 am - 8:54 am

ISP

PHL

20h 57m

2 stops

6:10 pm - 10:05 am

PHL

ISP

15h 55m

1 stop

$240Multiple Airlines

Sat, May 16 - Tue, May 19

6:09 pm - 8:00 pm

ISP

PHL

25h 51m

1 stop

6:10 pm - 10:05 am

PHL

ISP

15h 55m

1 stop

$261Multiple Airlines

Sat, May 16 - Tue, May 19

11:57 am - 9:28 pm

ISP

PHL

9h 31m

2 stops

2:57 pm - 11:00 am

PHL

ISP

20h 03m

1 stop

$294Multiple Airlines

Sat, May 16 - Mon, May 18

8:43 pm - 8:59 am

ISP

PHL

36h 16m

2 stops

2:57 pm - 11:00 am

PHL

ISP

20h 03m

1 stop

$307Multiple Airlines

Mon, May 11 - Mon, May 18

2:28 pm - 1:20 pm

ISP

PHL

22h 52m

1 stop

2:57 pm - 11:00 am

PHL

ISP

20h 03m

1 stop

$330Multiple Airlines

Mon, May 11 - Mon, May 18

10:48 am - 12:25 am

ISP

PHL

13h 37m

1 stop

2:48 pm - 4:47 pm

PHL

ISP

25h 59m

1 stop

$353Multiple Airlines

Fri, Jul 10 - Mon, Jul 13

10:48 am - 12:25 am

ISP

PHL

13h 37m

1 stop

4:35 pm - 4:47 pm

PHL

ISP

24h 12m

2 stops

$364Multiple Airlines

Fri, Jul 10 - Mon, Jul 13

6:09 pm - 8:00 pm

ISP

PHL

25h 51m

1 stop

8:30 am - 5:10 pm

PHL

ISP

8h 40m

2 stops

$383Multiple Airlines

Sat, May 16 - Sun, May 24

Frontier flights from Islip, New York to Philadelphia

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

Frontier

May 1

ISP8:31 pmIslip Long Island

21h 10m

1 stop

PHL5:41 pmPhiladelphia

May 5

PHL10:11 amPhiladelphia

23h 54m

1 stop

ISP10:05 amIslip Long Island

$204

Frontier

Apr 24

ISP8:31 pmIslip Long Island

16h 21m

1 stop

PHL12:52 pmPhiladelphia

Apr 25

PHL10:24 pmPhiladelphia

10h 49m

1 stop

ISP9:13 amIslip Long Island

$234

Frontier

May 1

ISP8:31 pmIslip Long Island

14h 31m

2 stops

PHL11:02 amPhiladelphia

May 5

PHL10:11 amPhiladelphia

23h 54m

1 stop

ISP10:05 amIslip Long Island

$238

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

Cheapest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 5/1

8:31 pm-5:41 pm

1 stop21h 10m

Philadelphia

Tue 5/5

10:11 am-10:05 am

1 stop23h 54m

$204

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 5/1

8:31 pm-11:02 am

2 stops14h 31m

Philadelphia

Tue 5/5

10:11 am-10:05 am

1 stop23h 54m

$238

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 5/16

11:57 am-8:54 am

2 stops20h 57m

Philadelphia

Tue 5/19

6:10 pm-10:05 am

1 stop15h 55m

$240

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 5/16

6:09 pm-8:00 pm

1 stop25h 51m

Philadelphia

Tue 5/19

6:10 pm-10:05 am

1 stop15h 55m

$261

Quickest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 5/16

11:57 am-9:28 pm

2 stops9h 31m

Philadelphia

Mon 5/18

2:57 pm-11:00 am

1 stop20h 03m

$294

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 5/11

8:43 pm-8:59 am

2 stops36h 16m

Philadelphia

Mon 5/18

2:57 pm-11:00 am

1 stop20h 03m

$307

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 5/11

2:28 pm-1:20 pm

1 stop22h 52m

Philadelphia

Mon 5/18

2:57 pm-11:00 am

1 stop20h 03m

$330

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 7/10

10:48 am-12:25 am

1 stop13h 37m

Philadelphia

Mon 7/13

2:48 pm-4:47 pm

1 stop25h 59m

$353

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 7/10

10:48 am-12:25 am

1 stop13h 37m

Philadelphia

Mon 7/13

4:35 pm-4:47 pm

2 stops24h 12m

$364

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 5/16

6:09 pm-8:00 pm

1 stop25h 51m

Philadelphia

Sun 5/24

8:30 am-5:10 pm

2 stops8h 40m

$383

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted 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 $377. 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 $595.

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 in the morning. momondo users have found flights departing from Islip, New York to Philadelphia in the morning for as low as $510. 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 $595.

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	9h 31m
Direct flights	None

The fastest flight from Islip, New York to Philadelphia takes 9h 31m

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

Search flight deals

Frequently asked questions about flying from Islip, New York to Philadelphia

How far is Islip Long Island to Philadelphia by plane?
There are 115.4 mi between Islip Long Island and Philadelphia. 9h 31m 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.

Wildwood

Cape May

Rehoboth Beach

Wildwood Crest

Ocean City

Cherry Hill

King of Prussia

Newark

Dewey Beach

Reading

Avalon

North Wildwood

Dover

Lewes

Stone Harbor

New Castle

Essington

Vineland

Pottstown

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.