$505+ 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Jan 4 — Jan 111
1 adult, Economy
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Cheapest flights from Islip to United KingdomExplore 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 December 5, 2025.
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 December 5, 2025.
This Kiwi.com deal was found by Cheapflights users on 12/3. 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 12/410:19 amISP - LGW
2 stops38h 41mMultiple Airlines
Thu 12/112:00 pmLGW - ISP
1 stop34h 34mMultiple Airlines
Deal found 12/3![Multiple Airlines logo]()
$1,212
This Kiwi.com deal was found by Cheapflights users on 12/3. 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 12/410:19 amISP - LGW
1 stop18h 41mMultiple Airlines
Wed 12/1011:40 amLGW - ISP
2 stops26h 33mMultiple Airlines
Deal found 12/3![Multiple Airlines logo]()
$1,812
This Kiwi.com deal was found by Cheapflights users on 12/3. 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 12/412:40 pmISP - LHR
1 stop13h 15mMultiple Airlines
Wed 12/106:00 amLHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 12/3![Multiple Airlines logo]()
$2,069
This Kiwi.com deal was found by Cheapflights users on 12/3. 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 12/412:40 pmISP - LHR
2 stops25h 15mMultiple Airlines
Thu 12/119:20 amLHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 12/3![Multiple Airlines logo]()
$2,497
Find 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 December 5, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $505 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $698 |
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 December 5, 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
Sat 1/17
8:00 am-10:05 am
1 stop21h 05m
London Gatwick
Sat 1/24
2:00 pm-8:40 am
1 stop23h 40m
$505
IslipLondon
ISP - LGW
ISPLGW
Islip Long Island
Fri 1/16
8:54 pm-10:05 am
1 stop32h 11m
London Gatwick
Fri 1/23
2:00 pm-11:05 am
2 stops26h 05m
$776
IslipLondon
ISP - LHR
ISPLHR
Islip Long Island
Mon 1/19
10:00 am-10:00 pm
2 stops31h 00m
London Heathrow
Mon 1/26
7:50 am-8:52 am
2 stops30h 02m
$1,039
IslipGlasgow
ISP - GLA
ISPGLA
Islip Long Island
Sat 1/17
10:00 am-4:00 pm
2 stops25h 00m
Glasgow Intl
Sat 1/24
8:20 am-8:52 am
2 stops29h 32m
$1,175
IslipLondon
ISP - LHR
ISPLHR
Islip Long Island
Sat 1/17
10:00 am-3:35 pm
2 stops24h 35m
London Heathrow
Sat 1/24
6:30 am-8:52 am
2 stops31h 22m
$1,207
IslipGlasgow
ISP - GLA
ISPGLA
Islip Long Island
Sun 1/18
7:25 am-7:50 am
2 stops19h 25m
Glasgow Intl
Sun 1/25
10:20 am-7:45 pm
2 stops14h 25m
$1,315
IslipLondon
ISP - LHR
ISPLHR
Islip Long Island
Fri 1/16
12:30 pm-5:30 pm
2 stops24h 00m
London Heathrow
Fri 1/23
9:20 am-4:10 pm
1 stop11h 50m
$1,591
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, August is the cheapest month in which you can book a flight from Islip, New York to United Kingdom (average of $144). Flying from Islip, New York to United Kingdom in June is currently the most expensive (average of $480). 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.