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Cheap flights from Islip, New York to London from $696

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to London departing on 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Islip, New York to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:25 pm - 7:30 pmISP  Islip Long Island-LHR London Heathrow
26h 05m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 pm - 9:40 pmLHR  London Heathrow-ISP Islip Long Island
14h 25m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$992Multiple Airlines
Sun, Nov 8 - Tue, Nov 17
Multiple Airlines Logo
12:30 pm - 7:30 pmISP  Islip Long Island-LHR London Heathrow
26h 00m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
8:35 pm - 9:40 pmLHR  London Heathrow-ISP Islip Long Island
30h 05m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$993Multiple Airlines
Wed, Nov 4 - Mon, Nov 9
Multiple Airlines Logo
12:50 pm - 11:55 amISP  Islip Long Island-LHR London Heathrow
18h 05m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
8:35 pm - 11:35 pmLHR  London Heathrow-ISP Islip Long Island
31h 00m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$994Multiple Airlines
Wed, Oct 21 - Thu, Oct 29
Multiple Airlines Logo
4:05 pm - 8:20 pmISP  Islip Long Island-LHR London Heathrow
23h 15m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
9:25 pm - 11:35 pmLHR  London Heathrow-ISP Islip Long Island
31h 10m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,000Multiple Airlines
Mon, Sep 21 - Wed, Oct 14
Multiple Airlines Logo
3:20 pm - 8:20 pmISP  Islip Long Island-LHR London Heathrow
24h 00m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
9:25 pm - 10:10 pmLHR  London Heathrow-ISP Islip Long Island
29h 45m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,008Multiple Airlines
Wed, Sep 9 - Thu, Sep 17
Multiple Airlines Logo
12:20 pm - 11:55 amISP  Islip Long Island-LHR London Heathrow
18h 35m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
1:05 pm - 10:35 pmLHR  London Heathrow-ISP Islip Long Island
14h 30m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,041Multiple Airlines
Sat, Oct 3 - Wed, Oct 21
Multiple Airlines Logo
3:50 pm - 10:50 amISP  Islip Long Island-LHR London Heathrow
14h 00m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
8:35 pm - 9:30 pmLHR  London Heathrow-ISP Islip Long Island
29h 55m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,043Multiple Airlines
Thu, Feb 4 - Mon, Feb 8
Multiple Airlines Logo
4:05 pm - 11:55 amISP  Islip Long Island-LHR London Heathrow
14h 50m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
9:25 pm - 10:10 pmLHR  London Heathrow-ISP Islip Long Island
29h 45m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,044Multiple Airlines
Thu, Sep 10 - Thu, Sep 17
Multiple Airlines Logo
4:05 pm - 11:55 amISP  Islip Long Island-LHR London Heathrow
14h 50m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
9:25 pm - 10:10 pmLHR  London Heathrow-ISP Islip Long Island
29h 45m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,049Multiple Airlines
Thu, Sep 10 - Thu, Sep 17
Multiple Airlines Logo
3:20 pm - 8:20 pmISP  Islip Long Island-LHR London Heathrow
24h 00m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 pm - 10:35 pmLHR  London Heathrow-ISP Islip Long Island
14h 20m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,052Multiple Airlines
Tue, Sep 8 - Wed, Oct 28

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Customize your flight search to find flights from Islip, New York to London Heathrow Airport 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, momondo users made 832,500 searches. Data last updated August 15, 2026.
Use the filters below to find and compare flights from Islip, New York to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sun 11/8

12:25 pm-7:30 pm

2 stops26h 05m

London Heathrow

Tue 11/17

12:15 pm-9:40 pm

2 stops14h 25m

$992

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 11/4

12:30 pm-7:30 pm

2 stops26h 00m

London Heathrow

Mon 11/9

8:35 pm-9:40 pm

2 stops30h 05m

$993

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 10/21

12:50 pm-11:55 am

2 stops18h 05m

London Heathrow

Thu 10/29

8:35 pm-11:35 pm

2 stops31h 00m

$994

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 9/21

4:05 pm-8:20 pm

2 stops23h 15m

London Heathrow

Wed 10/14

9:25 pm-11:35 pm

2 stops31h 10m

$1,000

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 9/9

3:20 pm-8:20 pm

2 stops24h 00m

London Heathrow

Thu 9/17

9:25 pm-10:10 pm

2 stops29h 45m

$1,008
Quickest round-trip

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sat 10/3

12:20 pm-11:55 am

2 stops18h 35m

London Heathrow

Wed 10/21

1:05 pm-10:35 pm

2 stops14h 30m

$1,041

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 2/4

3:50 pm-10:50 am

2 stops14h 00m

London Heathrow

Mon 2/8

8:35 pm-9:30 pm

2 stops29h 55m

$1,043

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 9/10

4:05 pm-11:55 am

2 stops14h 50m

London Heathrow

Thu 9/17

9:25 pm-10:10 pm

2 stops29h 45m

$1,044

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 9/10

4:05 pm-11:55 am

2 stops14h 50m

London Heathrow

Thu 9/17

9:25 pm-10:10 pm

2 stops29h 45m

$1,049

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 9/8

3:20 pm-8:20 pm

2 stops24h 00m

London Heathrow

Wed 10/28

12:15 pm-10:35 pm

2 stops14h 20m

$1,052

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Islip, New York to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $744. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $785.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from Islip, New York to London Heathrow Airport in the morning for as low as $730. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $786.

When to book flights from Islip, New York to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip, New York to London Heathrow Airport (ISP to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to London Heathrow Airport

Fastest flight time

13h 45m

Direct flights

None
The fastest flight from Islip, New York to London Heathrow Airport takes 13h 45m
There are no direct flights from Islip, New York to London Heathrow Airport. There are no popular flight routes from Islip, New York to London Heathrow Airport.
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Frequently asked questions about flying from Islip, New York to London Heathrow Airport

  • How far is Islip Long Island to London Heathrow by plane?

    A flight from Islip Long Island to London Heathrow will travel around 3412.8 mi. Typically, this will take 13h 45m by plane in normal conditions.

  • When did momondo last update prices for flights from Islip Long Island Airport to London Heathrow Airport?

    Prices for flights from Islip Long Island Airport to London Heathrow Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Islip Long Island Airport to London Heathrow Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Hayes
Stratford-upon-Avon
Wembley
Croydon
Dover
Stansted
Richmond
Kingston upon Thames
Harrow
Watford
Cobham
Slough
Uxbridge
Worthing
Romford
Ilford

Why use momondo?

Why should I use momondo to find a flight deal from Islip to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Islip.

Can I find flights from Islip to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from Islip with this policy.

How can momondo help me find flights from Islip to London?

momondo provides multiple filters to help you find the best flight to London from Islip. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Islip to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Islip to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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