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Delaware

$158+ Cheap flights from Islip (ISP) to Delaware

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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — ILG
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap flight deals from Islip to Delaware

Keep the following information in mind while searching for Islip to Delaware flight deals. Data was last updated September 16, 2025.

Round-trip from

$158
(Frontier)

Popular in

July

Cheapest in

December
From Islip Long Island to Delaware
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($74 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($31 potential savings vs. average RT price).
Search Deals

Find flight deals from Islip to Delaware

Cheapest flights from Islip to Delaware
Explore the most affordable flight options available from Islip to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3011:25 amISP - PHL
1 stop9h 46mFrontier
Tue 10/711:34 amPHL - ISP
1 stop9h 08mFrontier
Deal found 9/14$158
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2911:40 amISP - PHL
1 stop6h 05mFrontier
Fri 10/38:00 amPHL - ISP
1 stop8h 27mFrontier
Deal found 9/14$209
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/211:40 amISP - PHL
1 stop13h 12mFrontier
Thu 10/911:16 amPHL - ISP
1 stop9h 26mFrontier
Deal found 9/14$219
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/215:12 pmISP - PHL
1 stop7h 47mFrontier
Sun 9/285:01 amPHL - ISP
1 stop11h 26mFrontier
Deal found 9/14$238
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/3011:25 amISP - PHL
1 stop25h 37mMultiple Airlines
Sat 10/43:55 pmPHL - ISP
2 stops19h 05mMultiple Airlines
Deal found 9/15$314
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2111:25 amISP - PHL
1 stop12h 34mMultiple Airlines
Sun 9/287:32 pmPHL - ISP
2 stops39h 08mMultiple Airlines
Deal found 9/14$333
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1811:40 amISP - PHL
1 stop19h 55mFrontier
Sat 9/209:05 amPHL - ISP
2 stops25h 35mFrontier
Deal found 9/14$415
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1811:40 amISP - PHL
1 stop19h 55mMultiple Airlines
Sat 9/208:43 pmPHL - ISP
1 stop13h 57mMultiple Airlines
Deal found 9/14$416
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/206:00 amISP - PHL
1 stop18h 32mMultiple Airlines
Sat 12/277:30 amPHL - ISP
2 stops27h 30mMultiple Airlines
Deal found 9/15$790

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Delaware that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from Islip to Delaware that are best for you.

Fly from

Islip

Fly to

Delaware

Route

Depart

Return

Price

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 9/30

11:25 am-9:11 pm

1 stop9h 46m

Philadelphia

Tue 10/7

11:34 am-8:42 pm

1 stop9h 08m

$158

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 9/29

11:40 am-5:45 pm

1 stop6h 05m

Philadelphia

Fri 10/3

8:00 am-4:27 pm

1 stop8h 27m

$209

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 10/2

11:40 am-12:52 am

1 stop13h 12m

Philadelphia

Thu 10/9

11:16 am-8:42 pm

1 stop9h 26m

$219

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 9/30

11:25 am-1:02 pm

1 stop25h 37m

Philadelphia

Sat 10/4

3:55 pm-11:00 am

2 stops19h 05m

$314

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 12/20

6:00 am-12:32 am

1 stop18h 32m

Philadelphia

Sat 12/27

7:30 am-11:00 am

2 stops27h 30m

$790

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 10/18

11:35 am-7:04 pm

1 stop7h 29m

$162

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Best time to book a flight from Islip to Delaware

Have a flexible travel schedule? Discover the best time to fly to Delaware 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 Delaware
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Islip to Delaware. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Delaware?

    Islip Long Island (ISP), located 7.2 mi from the city center, is the airport you fly out of when you book flights from Islip to Delaware.

  • How long is the flight from Islip to Delaware?

    A quick flight from Islip to Delaware can take about 9h 46m. Frontier provides one of the quickest options available for as low as $158. Airlines will cover a distance of 129 mi.

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

    Yes. In addition to deals on Islip to Delaware flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Delaware?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Delaware.

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

    Yes. Cheapflights offers flight deals from Islip to Delaware by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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