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Cheap flights from Islip, New York to London from $464

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 5/27. 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
0 bags

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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
9:59 am - 9:15 am
ISP
-
LHR
18h 16m
2 stops
Multiple Airlines Logo
7:50 am - 6:44 pm
LHR
-
ISP
15h 54m
2 stops
$1,206Multiple Airlines
Fri, Feb 27 - Mon, Mar 2
Multiple Airlines Logo
9:59 am - 5:45 am
ISP
-
LHR
15h 46m
1 stop
Multiple Airlines Logo
9:40 am - 6:44 pm
LHR
-
ISP
14h 04m
1 stop
$1,313Multiple Airlines
Sat, Mar 28 - Sat, Apr 4
Multiple Airlines Logo
9:59 am - 8:00 am
ISP
-
LHR
17h 01m
1 stop
Multiple Airlines Logo
8:10 pm - 6:44 pm
LHR
-
ISP
27h 34m
1 stop
$1,339Multiple Airlines
Tue, Mar 31 - Tue, Apr 7
Multiple Airlines Logo
9:59 am - 8:00 am
ISP
-
LHR
17h 01m
1 stop
Multiple Airlines Logo
8:10 pm - 6:44 pm
LHR
-
ISP
27h 34m
1 stop
$1,395Multiple Airlines
Sun, Mar 29 - Sun, Apr 5
Multiple Airlines Logo
9:59 am - 6:50 am
ISP
-
LHR
15h 51m
1 stop
Multiple Airlines Logo
9:40 am - 6:44 pm
LHR
-
ISP
14h 04m
1 stop
$1,427Multiple Airlines
Fri, Feb 27 - Mon, Mar 2
Multiple Airlines Logo
1:07 pm - 5:20 pm
ISP
-
LHR
23h 13m
2 stops
Multiple Airlines Logo
8:50 am - 9:09 am
LHR
-
ISP
29h 19m
2 stops
$1,463Multiple Airlines
Tue, Mar 31 - Tue, Apr 7
Multiple Airlines Logo
9:59 am - 8:05 am
ISP
-
LHR
17h 06m
2 stops
Multiple Airlines Logo
9:40 am - 6:44 pm
LHR
-
ISP
14h 04m
1 stop
$1,481Multiple Airlines
Fri, Feb 27 - Mon, Mar 2
Multiple Airlines Logo
9:59 am - 10:20 am
ISP
-
LHR
19h 21m
2 stops
Multiple Airlines Logo
9:40 am - 6:44 pm
LHR
-
ISP
14h 04m
1 stop
$1,547Multiple Airlines
Tue, Mar 31 - Tue, Apr 7
Multiple Airlines Logo
9:59 am - 10:20 am
ISP
-
LHR
19h 21m
2 stops
Multiple Airlines Logo
9:40 am - 6:44 pm
LHR
-
ISP
14h 04m
1 stop
$1,563Multiple Airlines
Sun, Mar 29 - Sun, Apr 5
Multiple Airlines Logo
9:59 am - 6:50 am
ISP
-
LHR
16h 51m
1 stop
Multiple Airlines Logo
9:40 am - 6:44 pm
LHR
-
ISP
13h 04m
1 stop
$1,798Multiple Airlines
Thu, Mar 12 - Fri, Mar 20

momondo Fare Finder

 
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 February 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

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 2/27

9:59 am-9:15 am

2 stops18h 16m

London Heathrow

Mon 3/2

7:50 am-6:44 pm

2 stops15h 54m

$1,206

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 3/28

9:59 am-5:45 am

1 stop15h 46m

London Heathrow

Sat 4/4

9:40 am-6:44 pm

1 stop14h 04m

$1,313

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 3/31

9:59 am-8:00 am

1 stop17h 01m

London Heathrow

Tue 4/7

8:10 pm-6:44 pm

1 stop27h 34m

$1,339

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 3/29

9:59 am-8:00 am

1 stop17h 01m

London Heathrow

Sun 4/5

8:10 pm-6:44 pm

1 stop27h 34m

$1,395

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 2/27

9:59 am-6:50 am

1 stop15h 51m

London Heathrow

Mon 3/2

9:40 am-6:44 pm

1 stop14h 04m

$1,427

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 3/31

1:07 pm-5:20 pm

2 stops23h 13m

London Heathrow

Tue 4/7

8:50 am-9:09 am

2 stops29h 19m

$1,463

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 2/27

9:59 am-8:05 am

2 stops17h 06m

London Heathrow

Mon 3/2

9:40 am-6:44 pm

1 stop14h 04m

$1,481

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 3/31

9:59 am-10:20 am

2 stops19h 21m

London Heathrow

Tue 4/7

9:40 am-6:44 pm

1 stop14h 04m

$1,547

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 3/29

9:59 am-10:20 am

2 stops19h 21m

London Heathrow

Sun 4/5

9:40 am-6:44 pm

1 stop14h 04m

$1,563

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 3/12

9:59 am-6:50 am

1 stop16h 51m

London Heathrow

Fri 3/20

9:40 am-6:44 pm

1 stop13h 04m

$1,798

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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 $642. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $701.

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 $612. 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 $688.

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

17h 01m

Direct flights

None
The fastest flight from Islip, New York to London Heathrow Airport takes 17h 01m
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.
Search flight deals

  • 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 17h 01m 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
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Crawley
Hayes
Wembley
Dartford
Stratford-upon-Avon
Croydon
Brentwood
Guildford
Harrow
Watford
Cobham
Folkestone
Romford
Stansted

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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