$722+ 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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Feb 3 — Feb 101
1 adult, Economy
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Islip to United Kingdom
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 January 4, 2026.
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 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/2. 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.
Mon 2/163:34 pmISP - LGW
1 stop13h 26mMultiple Airlines
Mon 2/232:00 pmLGW - ISP
2 stops50h 10mMultiple Airlines
Deal found 1/2![Multiple Airlines logo]()
$722
This Ovago deal was found by Cheapflights users on 1/3. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/97:25 amISP - LHR
1 stop18h 25mMultiple Airlines
Fri 1/166:30 amLHR - ISP
2 stops18h 15mMultiple Airlines
Deal found 1/3![Multiple Airlines logo]()
$1,293
This Ovago deal was found by Cheapflights users on 1/1. 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.
Mon 2/169:59 amISP - GLA
2 stops16h 51mMultiple Airlines
Mon 2/238:55 amGLA - ISP
2 stops15h 50mMultiple Airlines
Deal found 1/1![Multiple Airlines logo]()
$1,310
This Expedia deal was found by Cheapflights users on 1/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/179:29 amISP - LHR
2 stops30h 36mMultiple Airlines
Tue 2/248:50 amLHR - ISP
2 stops28h 57mMultiple Airlines
Deal found 1/3![Multiple Airlines logo]()
$1,412
This Expedia deal was found by Cheapflights users on 1/2. 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.
Mon 2/169:29 amISP - LHR
2 stops25h 06mMultiple Airlines
Mon 2/239:50 amLHR - ISP
2 stops27h 57mMultiple Airlines
Deal found 1/2![Multiple Airlines logo]()
$1,625
This Expedia deal was found by Cheapflights users on 1/2. 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 1/1010:00 amISP - LHR
2 stops21h 20mMultiple Airlines
Sun 1/118:45 pmLHR - ISP
2 stops41h 07mMultiple Airlines
Deal found 1/2![Multiple Airlines logo]()
$1,754
This Mytrip deal was found by Cheapflights users on 1/2. 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.
Wed 1/712:30 pmISP - LHR
2 stops27h 05mMultiple Airlines
Sat 1/106:00 amLHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 1/2![Multiple Airlines logo]()
$1,847
This Mytrip deal was found by Cheapflights users on 1/2. 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.
Wed 1/712:30 pmISP - LGW
2 stops16h 20mMultiple Airlines
Sat 1/108:15 pmLGW - ISP
3 stops28h 30mMultiple Airlines
Deal found 1/2![Multiple Airlines logo]()
$2,323
This Trip.com deal was found by Cheapflights users on 1/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/910:00 amISP - LGW
1 stop16h 30mMultiple Airlines
Fri 1/1611:20 amLGW - ISP
1 stop26h 32mMultiple Airlines
Deal found 1/3![Multiple Airlines logo]()
$6,560
This Trip.com deal was found by Cheapflights users on 1/2. 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.
Thu 4/165:15 pmISP - LGW
1 stop32h 35mMultiple Airlines
Mon 4/202:00 pmLGW - ISP
1 stop31h 19mMultiple Airlines
Deal found 1/2![Multiple Airlines logo]()
$6,598
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 January 4, 2026.
Most accurate provider | Mytrip 3 stars |
|---|---|
Most trusted provider | Mytrip 3 stars |
Round-trip from | $722 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $437 |
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 4, 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
IslipLondon
ISP - LGW
ISPLGW
Islip Long Island
Mon 2/16
3:34 pm-10:00 am
1 stop13h 26m
London Gatwick
Mon 2/23
2:00 pm-11:10 am
2 stops50h 10m
$722
IslipGlasgow
ISP - GLA
ISPGLA
Islip Long Island
Mon 2/16
9:59 am-7:50 am
2 stops16h 51m
Glasgow Intl
Mon 2/23
8:55 am-7:45 pm
2 stops15h 50m
$1,310
IslipLondon
ISP - LHR
ISPLHR
Islip Long Island
Tue 2/17
9:29 am-9:05 pm
2 stops30h 36m
London Heathrow
Tue 2/24
8:50 am-8:47 am
2 stops28h 57m
$1,412
IslipLondon
ISP - LHR
ISPLHR
Islip Long Island
Mon 2/16
9:29 am-3:35 pm
2 stops25h 06m
London Heathrow
Mon 2/23
9:50 am-8:47 am
2 stops27h 57m
$1,625
IslipLondon
ISP - LHR
ISPLHR
Islip Long Island
Thu 4/16
5:15 pm-1:25 pm
2 stops39h 10m
London Heathrow
Mon 4/20
8:10 pm-4:19 pm
2 stops49h 09m
$2,248
IslipLondon
ISP - LHR
ISPLHR
Islip Long Island
Tue 3/3
9:59 am-7:00 am
1 stop16h 01m
London Heathrow
Mon 3/16
8:50 am-7:45 pm
2 stops14h 55m
$4,245
IslipLondon
ISP - LGW
ISPLGW
Islip Long Island
Thu 4/16
5:15 pm-6:50 am
1 stop32h 35m
London Gatwick
Mon 4/20
2:00 pm-4:19 pm
1 stop31h 19m
$6,598
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 June is currently the most expensive (average of $451). 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.