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$741+ Cheap flights from Islip, NY (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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
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 January 15, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$741
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$568
Provider with most accurate pricing for New York (NYC)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-London (LON) flights.
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From Islip Long Island to United Kingdom
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Highest demand for flights based on searches. 4% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 15, 2026.

This Trip.com deal was found by Cheapflights users on 1/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2812:01 pm
ISP
-
GLA
2 stops16h 54m
Multiple Airlines
Sat 3/712:35 pm
GLA
-
ISP
2 stops31h 48m
Multiple Airlines
Deal found 1/14$741
This Kiwi.com deal was found by Cheapflights users on 1/15. 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.
Fri 3/201:42 pm
ISP
-
LGW
1 stop16h 18m
Multiple Airlines
Wed 3/258:30 pm
LGW
-
ISP
2 stops45h 01m
Multiple Airlines
Deal found 1/15$874
This Kiwi.com deal was found by Cheapflights users on 1/15. 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 3/319:59 am
ISP
-
LGW
2 stops43h 01m
Multiple Airlines
Mon 4/132:00 pm
LGW
-
ISP
1 stop14h 14m
Multiple Airlines
Deal found 1/15$935
This Expedia deal was found by Cheapflights users on 1/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/289:39 am
ISP
-
LHR
2 stops27h 11m
Multiple Airlines
Sat 3/78:50 am
LHR
-
ISP
2 stops27h 47m
Multiple Airlines
Deal found 1/14$1,228
This Ovago deal was found by Cheapflights users on 1/15. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/112:30 pm
ISP
-
MAN
2 stops14h 10m
Multiple Airlines
Fri 5/84:05 pm
MAN
-
ISP
2 stops24h 00m
Multiple Airlines
Deal found 1/15$1,294
This Ovago deal was found by Cheapflights users on 1/14. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/19:59 am
ISP
-
LHR
1 stop16h 01m
Multiple Airlines
Sun 3/87:10 pm
LHR
-
ISP
1 stop27h 34m
Multiple Airlines
Deal found 1/14$1,295
This Ovago deal was found by Cheapflights users on 1/13. 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.
Fri 2/279:59 am
ISP
-
LHR
1 stop15h 51m
Multiple Airlines
Fri 3/69:40 am
LHR
-
ISP
1 stop14h 04m
Multiple Airlines
Deal found 1/13$1,352
This Ovago deal was found by Cheapflights users on 1/13. 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.
Fri 2/279:59 am
ISP
-
EDI
2 stops16h 51m
Multiple Airlines
Fri 3/69:00 am
EDI
-
ISP
2 stops14h 44m
Multiple Airlines
Deal found 1/13$1,627

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 January 15, 2026.
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

IslipGlasgow

ISP - GLA

ISPGLA

Islip Long Island

Sat 2/28

12:01 pm-9:55 am

2 stops16h 54m

Glasgow Intl

Sat 3/7

12:35 pm-3:23 pm

2 stops31h 48m

$741

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 3/20

1:42 pm-10:00 am

1 stop16h 18m

London Gatwick

Wed 3/25

8:30 pm-1:31 pm

2 stops45h 01m

$874

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Tue 3/31

9:59 am-10:00 am

2 stops43h 01m

London Gatwick

Mon 4/13

2:00 pm-11:14 pm

1 stop14h 14m

$935

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 2/28

9:39 am-5:50 pm

2 stops27h 11m

London Heathrow

Sat 3/7

8:50 am-7:37 am

2 stops27h 47m

$1,228

IslipManchester

ISP - MAN

ISPMAN

Islip Long Island

Fri 5/1

12:30 pm-7:40 am

2 stops14h 10m

Manchester

Fri 5/8

4:05 pm-11:05 am

2 stops24h 00m

$1,294

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 3/1

9:59 am-7:00 am

1 stop16h 01m

London Heathrow

Sun 3/8

7:10 pm-6:44 pm

1 stop27h 34m

$1,295

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 2/27

9:59 am-6:50 am

1 stop15h 51m

London Heathrow

Fri 3/6

9:40 am-6:44 pm

1 stop14h 04m

$1,352

IslipEdinburgh

ISP - EDI

ISPEDI

Islip Long Island

Fri 2/27

9:59 am-7:50 am

2 stops16h 51m

Edinburgh Turnhouse

Fri 3/6

9:00 am-6:44 pm

2 stops14h 44m

$1,627

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/14

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, New York to United Kingdom?

Currently, November is the cheapest month in which you can book a flight from Islip, New York to United Kingdom (average of $75). Flying from Islip, New York to United Kingdom in July is currently the most expensive (average of $406). 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, New York to United Kingdom?

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

    Currently, November is the cheapest month in which you can book a flight from Islip, New York to United Kingdom (average of $75). Flying from Islip, New York to United Kingdom in July is currently the most expensive (average of $406). 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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