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$654+ Cheap flights from Islip (ISP) to the United Kingdom

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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Islip to United Kingdom

Keep the following information in mind while searching for Islip to United Kingdom flight deals. Data was last updated September 11, 2025.

Round-trip from

$654
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$515
From Islip Long Island to United Kingdom
Search Deals
High demand for flights, 3% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from Islip to United Kingdom

Cheapest flights from Islip to United Kingdom
Explore the most affordable flight options available from Islip to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Fri 10/104:58 pmISP - LGW
1 stop36h 02mMultiple Airlines
Tue 10/142:00 pmLGW - ISP
1 stop25h 57mMultiple Airlines
Deal found 9/11$654
This Mytrip deal was found by Cheapflights users on 9/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:19 pmISP - LGW
2 stops15h 36mMultiple Airlines
Sun 12/142:10 pmLGW - ISP
2 stops25h 26mMultiple Airlines
Deal found 9/10$1,030
This Mytrip deal was found by Cheapflights users on 9/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/411:53 amISP - LHR
2 stops16h 22mMultiple Airlines
Sun 12/148:50 amLHR - ISP
2 stops16h 11mMultiple Airlines
Deal found 9/10$1,045
This Ovago deal was found by Cheapflights users on 9/11. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/262:19 pmISP - GLA
2 stops14h 31mMultiple Airlines
Sun 11/23:55 pmGLA - ISP
2 stops24h 03mMultiple Airlines
Deal found 9/11$1,267
This Ovago deal was found by Cheapflights users on 9/11. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/94:33 pmISP - EDI
2 stops12h 47mMultiple Airlines
Thu 10/165:50 amEDI - ISP
2 stops14h 31mMultiple Airlines
Deal found 9/11$1,396
This Ovago deal was found by Cheapflights users on 9/11. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2611:53 amISP - EDI
2 stops15h 57mMultiple Airlines
Sun 11/210:00 amEDI - ISP
2 stops15h 01mMultiple Airlines
Deal found 9/11$1,404
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/104:33 pmISP - LHR
2 stops32h 57mMultiple Airlines
Tue 10/146:00 amLHR - ISP
2 stops19h 01mMultiple Airlines
Deal found 9/11$1,627
This United deal was found by Cheapflights users on 9/10. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/52:19 pmISP - LHR
2 stops15h 06mMultiple Airlines
Sun 12/148:00 amLHR - ISP
2 stops17h 01mMultiple Airlines
Deal found 9/10$6,215

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to United Kingdom 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 11, 2025.
Use the filters below to find and compare flights from Islip to the United Kingdom that are best for you.

Fly from

Islip

Fly to

United Kingdom

Route

Depart

Return

Price

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 10/10

4:58 pm-10:00 am

1 stop36h 02m

London Gatwick

Tue 10/14

2:00 pm-10:57 am

1 stop25h 57m

$654

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 12/4

2:19 pm-10:55 am

2 stops15h 36m

London Gatwick

Sun 12/14

2:10 pm-10:36 am

2 stops25h 26m

$1,030

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 12/4

11:53 am-9:15 am

2 stops16h 22m

London Heathrow

Sun 12/14

8:50 am-8:01 pm

2 stops16h 11m

$1,045

IslipGlasgow

ISP - GLA

ISPGLA

Islip Long Island

Sun 10/26

2:19 pm-8:50 am

2 stops14h 31m

Glasgow Intl

Sun 11/2

3:55 pm-10:58 am

2 stops24h 03m

$1,267

IslipEdinburgh

ISP - EDI

ISPEDI

Islip Long Island

Thu 10/9

4:33 pm-10:20 am

2 stops12h 47m

Edinburgh Turnhouse

Thu 10/16

5:50 am-3:21 pm

2 stops14h 31m

$1,396

IslipEdinburgh

ISP - EDI

ISPEDI

Islip Long Island

Sun 10/26

11:53 am-7:50 am

2 stops15h 57m

Edinburgh Turnhouse

Sun 11/2

10:00 am-8:01 pm

2 stops15h 01m

$1,404

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 10/10

4:33 pm-6:30 am

2 stops32h 57m

London Heathrow

Tue 10/14

6:00 am-8:01 pm

2 stops19h 01m

$1,627

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 12/5

2:19 pm-10:25 am

2 stops15h 06m

London Heathrow

Sun 12/14

8:00 am-8:01 pm

2 stops17h 01m

$6,215

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Best time to book a flight from Islip to United Kingdom

Have a flexible travel schedule? Discover the best time to fly to United Kingdom 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 the United Kingdom

What is the cheapest month to book a flight from Islip to United Kingdom?

Currently, November is the cheapest month in which you can book a flight from Islip to United Kingdom (average of $661). Flying from Islip to United Kingdom in June is currently the most expensive (average of $1,098). 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.

Related info for your journey

Find useful and relevant information for your journey from Islip to United Kingdom. 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 United Kingdom?

    Located just 7.2 mi from the city center, Islip Long Island (ISP) is the airport most travelers will use when flying to United Kingdom from Islip.

  • What are the most popular routes from Islip to United Kingdom?

    Most travelers choose Islip Long Island - London Heathrow, Islip Long Island - London Gatwick or Islip Long Island - Belfast Intl when deciding on the best route from Islip to United Kingdom.

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

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

  • How can I find direct flights from Islip to United Kingdom?

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

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

    Yes. Cheapflights offers flight deals from Islip to United Kingdom 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 to United Kingdom?

    Currently, November is the cheapest month in which you can book a flight from Islip to United Kingdom (average of $661). Flying from Islip to United Kingdom in June is currently the most expensive (average of $1,098). 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

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