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$516+ Cheap flights from Islip, NY (ISP) to Heathrow (LHR)

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 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LHR
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheap 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 October 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$741
(Trip.com)

One-way from

$516
(Mytrip)

Popular in

December

Cheapest in

January

Average price

$550
Provider with most accurate pricing for Islip Long Island-London Heathrow flight deals.
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Provider most trusted by Cheapflights users for Islip Long Island-London Heathrow flights.
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From Islip Long Island to London Heathrow
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One-way flight from Islip Long Island to London Heathrow
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High demand for flights, 4% potential price rise
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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 October 2025
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Find flight deals from Islip to Heathrow

Cheapest flights from Islip to Heathrow
Explore the most affordable flight options available from Islip to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This Trip.com deal was found by Cheapflights users on 10/27. 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 12/111:15 pmISP - LHR
1 stop17h 40mMultiple Airlines
Thu 12/181:05 pmLHR - ISP
2 stops39h 54mMultiple Airlines
Deal found 10/27$741
This Expedia deal was found by Cheapflights users on 10/27. 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 12/1111:50 amISP - LHR
2 stops27h 55mJetBlue
Thu 12/187:25 amLHR - ISP
2 stops40h 19mJetBlue
Deal found 10/27$1,107
This Kiwi.com deal was found by Cheapflights users on 10/25. 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 12/1012:40 pmISP - LHR
1 stop13h 15mMultiple Airlines
Wed 12/171:40 pmLHR - ISP
2 stops35h 05mMultiple Airlines
Deal found 10/25$1,749

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 October 28, 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

Thu 12/11

1:15 pm-11:55 am

1 stop17h 40m

London Heathrow

Thu 12/18

1:05 pm-11:59 pm

2 stops39h 54m

$741

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 12/11

11:50 am-8:45 pm

2 stops27h 55m

London Heathrow

Thu 12/18

7:25 am-6:44 pm

2 stops40h 19m

$1,107

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 12/10

12:40 pm-6:55 am

1 stop13h 15m

London Heathrow

Wed 12/17

1:40 pm-7:45 pm

2 stops35h 05m

$1,749

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

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 October.
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 $352). 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.

  • How long is the flight from Islip, New York to London Heathrow Airport?

    For as low as $1,107, JetBlue can have you in London Heathrow Airport from Islip, New York in 27h 55m. There are 3406 mi between Islip, New York and London Heathrow Airport.

  • 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 $352). 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
Hounslow
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Chipping Norton
Wembley
Folkestone

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