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$877+ Cheap flights from Islip, NY (ISP) to London (LON)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
May 18 — May 251
Mon 5/18
Mon 5/25
1 adult, Economy
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Cheap flight deals from Islip to London

Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 18, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/17. 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 6/26:02 pm
ISP
-
LGW
2 stops35h 43m
Multiple Airlines
Tue 6/92:00 pm
LGW
-
ISP
1 stop25h 03m
Multiple Airlines
Deal found 4/17$909
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 5/3111:00 am
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Sun 6/72:00 pm
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 4/16$1,036
This Kiwi.com deal was found by Cheapflights users on 4/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2811:00 am
ISP
-
LGW
2 stops39h 55m
Multiple Airlines
Thu 6/42:00 pm
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 4/13$1,059
This Kiwi.com deal was found by Cheapflights users on 4/14. 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.
Fri 5/2911:00 am
ISP
-
LGW
2 stops39h 55m
Multiple Airlines
Fri 6/52:00 pm
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 4/14$1,073
This Kiwi.com deal was found by Cheapflights users on 4/17. 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.
Wed 4/2211:50 am
ISP
-
LGW
2 stops17h 10m
Multiple Airlines
Wed 4/292:00 pm
LGW
-
ISP
1 stop24h 33m
Multiple Airlines
Deal found 4/17$1,080
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 6/111:00 am
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Mon 6/82:00 pm
LGW
-
ISP
1 stop30h 56m
Multiple Airlines
Deal found 4/16$1,084
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 5/3011:00 am
ISP
-
LGW
2 stops18h 45m
Multiple Airlines
Sat 6/62:00 pm
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 4/15$1,100
This Kiwi.com deal was found by Cheapflights users on 4/15. 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 5/1511:00 am
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Fri 5/222:00 pm
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 4/15$1,134
This Kiwi.com deal was found by Cheapflights users on 4/14. 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.
Tue 6/164:41 pm
ISP
-
LGW
1 stop36h 19m
Multiple Airlines
Sun 6/212:00 pm
LGW
-
ISP
1 stop25h 03m
Multiple Airlines
Deal found 4/14$1,172
This FlightHub deal was found by Cheapflights users on 4/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/158:59 pm
ISP
-
LHR
2 stops31h 31m
JetBlue
Fri 5/228:40 am
LHR
-
ISP
2 stops32h 52m
JetBlue
Deal found 4/15$1,342
This Travelocity deal was found by Cheapflights users on 4/13. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/146:40 pm
ISP
-
LHR
2 stops37h 50m
Multiple Airlines
Sun 5/176:10 pm
LHR
-
ISP
2 stops52h 34m
Multiple Airlines
Deal found 4/13$1,367
This Expedia deal was found by Cheapflights users on 4/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/146:40 pm
ISP
-
LHR
2 stops41h 40m
Multiple Airlines
Thu 5/217:40 am
LHR
-
ISP
2 stops34h 59m
Multiple Airlines
Deal found 4/13$1,385

Find flight deals from Islip to London

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$909
(Kiwi.com)

One-way from

$877
(Icelandair)

Popular in

December

Cheapest in

September

Average price

$623
Provider with most accurate pricing for Islip Long Island-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-London (LON) flights.
Search Deals
From Islip Long Island to London (LON)
Search Deals
One-way flight from Islip Long Island to London (LON)
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to London 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 April 18, 2026.
Use the filters below to find and compare flights from Islip to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Tue 6/2

6:02 pm-10:45 am

2 stops35h 43m

London Gatwick

Tue 6/9

2:00 pm-10:03 am

1 stop25h 03m

$909

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 5/31

11:00 am-10:00 am

1 stop18h 00m

London Gatwick

Sun 6/7

2:00 pm-10:05 am

1 stop25h 05m

$1,036

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 5/28

11:00 am-7:55 am

2 stops39h 55m

London Gatwick

Thu 6/4

2:00 pm-10:05 am

1 stop25h 05m

$1,059

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 5/29

11:00 am-7:55 am

2 stops39h 55m

London Gatwick

Fri 6/5

2:00 pm-10:05 am

1 stop25h 05m

$1,073

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 6/1

11:00 am-10:00 am

1 stop18h 00m

London Gatwick

Mon 6/8

2:00 pm-3:56 pm

1 stop30h 56m

$1,084

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 5/30

11:00 am-10:45 am

2 stops18h 45m

London Gatwick

Sat 6/6

2:00 pm-10:05 am

1 stop25h 05m

$1,100

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 5/15

11:00 am-10:00 am

1 stop18h 00m

London Gatwick

Fri 5/22

2:00 pm-10:05 am

1 stop25h 05m

$1,134

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 5/14

6:40 pm-1:30 pm

2 stops37h 50m

London Heathrow

Sun 5/17

6:10 pm-5:44 pm

2 stops52h 34m

$1,367

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 5/14

6:40 pm-5:20 pm

2 stops41h 40m

London Heathrow

Thu 5/21

7:40 am-1:39 pm

2 stops34h 59m

$1,385

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 5/28

2:35 pm-3:00 pm

2 stops19h 25m

London Heathrow

Thu 6/4

9:50 am-1:39 pm

2 stops32h 49m

$1,441

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

Compare providers for flights from Islip to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to London in April.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Islip, New York-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Islip to London

Have a flexible travel schedule? Discover the best time to fly to London 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 London
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 London. 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 London?

    For a flight from Islip to London, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 outbound flights to London per day. 0 airlines have flights to London from Islip Long Island on a regular basis.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to London 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

Traveling to a place near London?

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