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$1,107+ Cheap flights from Islip, NY (ISP) to Heathrow (LHR)

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 1/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
ene. 11 — ene. 181
dom. 1/11
dom. 1/18
1 adult, Economy
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Cheap flight deals from Islip to Heathrow

Best flights from Islip to Heathrow
Discover carefully curated flight deals from Islip to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated diciembre 12, 2025.

This Mytrip deal was found by Cheapflights users on 12/11. 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.
dom. 1/2512:30 pmISP - LHR
2 stops14h 35mMultiple Airlines
dom. 2/18:50 amLHR - ISP
2 stops15h 55mMultiple Airlines
Deal found 12/11$1,107
This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/199:47 amISP - LHR
2 stops27h 03mMultiple Airlines
jue. 4/26:10 pmLHR - ISP
2 stops43h 59mMultiple Airlines
Deal found 12/10$2,032
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 1/2312:30 pmISP - LHR
1 stop13h 25mMultiple Airlines
mié. 1/2812:15 pmLHR - ISP
2 stops27h 50mMultiple Airlines
Deal found 12/10$4,873
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 1/2312:30 pmISP - LHR
1 stop13h 25mMultiple Airlines
lun. 1/268:35 pmLHR - ISP
2 stops43h 30mMultiple Airlines
Deal found 12/10$4,874
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/219:59 amISP - LHR
1 stop15h 56mMultiple Airlines
mié. 1/286:00 amLHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 12/10$4,887
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 1/209:59 amISP - LHR
1 stop15h 56mMultiple Airlines
jue. 1/296:00 amLHR - ISP
2 stops18h 45mMultiple Airlines
Deal found 12/10$4,887
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/2112:30 pmISP - LHR
2 stops19h 10mMultiple Airlines
mar. 1/279:20 amLHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 12/10$4,899
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 1/2212:30 pmISP - LHR
2 stops19h 10mMultiple Airlines
jue. 1/299:20 amLHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 12/10$4,899
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 1/2212:30 pmISP - LHR
2 stops17h 55mMultiple Airlines
mar. 1/279:20 amLHR - ISP
1 stop11h 50mMultiple Airlines
Deal found 12/10$4,899

Find flight deals from Islip to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Heathrow (LHR). 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 diciembre 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,107
(Mytrip)

Popular in

December

Cheapest in

January

Average price

$729
Provider with most accurate pricing for Islip Long Island-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-London Heathrow flights.
Search Deals
From Islip Long Island to London Heathrow
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Heathrow 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 diciembre 12, 2025.
Use the filters below to find and compare flights from Islip to London Heathrow Airport that are best for you.

Fly from

Islip

Fly to

Heathrow

Route

Depart

Return

Price

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

dom. 1/25

12:30 pm-8:05 am

2 stops14h 35m

London Heathrow

dom. 2/1

8:50 am-7:45 pm

2 stops15h 55m

$1,107

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

jue. 3/19

9:47 am-4:50 pm

2 stops27h 03m

London Heathrow

jue. 4/2

6:10 pm-9:09 am

2 stops43h 59m

$2,032

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

vie. 1/23

12:30 pm-6:55 am

1 stop13h 25m

London Heathrow

mié. 1/28

12:15 pm-11:05 am

2 stops27h 50m

$4,873

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

vie. 1/23

12:30 pm-6:55 am

1 stop13h 25m

London Heathrow

lun. 1/26

8:35 pm-11:05 am

2 stops43h 30m

$4,874

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

mié. 1/21

9:59 am-6:55 am

1 stop15h 56m

London Heathrow

mié. 1/28

6:00 am-7:45 pm

2 stops18h 45m

$4,887

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

mar. 1/20

9:59 am-6:55 am

1 stop15h 56m

London Heathrow

jue. 1/29

6:00 am-7:45 pm

2 stops18h 45m

$4,887

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

mié. 1/21

12:30 pm-12:40 pm

2 stops19h 10m

London Heathrow

mar. 1/27

9:20 am-4:10 pm

1 stop11h 50m

$4,899

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

jue. 1/22

12:30 pm-12:40 pm

2 stops19h 10m

London Heathrow

jue. 1/29

9:20 am-4:10 pm

1 stop11h 50m

$4,899

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

jue. 1/22

12:30 pm-11:25 am

2 stops17h 55m

London Heathrow

mar. 1/27

9:20 am-4:10 pm

1 stop11h 50m

$4,899

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Compare providers for flights from Islip to Heathrow

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 Heathrow in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 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 Heathrow Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-London Heathrow Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Islip, New York-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-London Heathrow Airport flights, Cheapflights users trust eDreams the most. eDreams 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 Heathrow Airport 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 Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow 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 Heathrow Airport

What is the cheapest month to book a flight from Islip, New York to London Heathrow Airport?

Currently, February is the cheapest month in which you can book a flight from Islip, New York to London Heathrow Airport (average of $390). Flying from Islip, New York to London Heathrow Airport in June is currently the most expensive (average of $577). 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 Heathrow. 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 Heathrow?

    Islip Long Island (ISP), located 7.2 mi from the city center, is the airport you fly out of when you book flights from Islip to London Heathrow. 0 airlines have flights from Long Island to London Heathrow on a regular basis. Booking flights from Islip Long Island to London Heathrow should not be difficult; the airport handles an average of 0 outbound flights to London Heathrow per day.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip to Heathrow 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 London Heathrow Airport?

    Currently, February is the cheapest month in which you can book a flight from Islip, New York to London Heathrow Airport (average of $390). Flying from Islip, New York to London Heathrow Airport in June is currently the most expensive (average of $577). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Ilford
Hounslow
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Northampton
Watford
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Wembley

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