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Cheap flights from Islip, New York to London from $765

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 5/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
JetBlue Logo
8:59 pm - 6:30 am
ISP
-
LHR
52h 31m
2 stops
JetBlue Logo
11:55 am - 5:44 pm
LHR
-
ISP
58h 49m
2 stops
$1,194JetBlue
Thu, May 7 - Thu, May 14
Multiple Airlines Logo
6:40 pm - 1:30 pm
ISP
-
LHR
37h 50m
2 stops
Multiple Airlines Logo
6:10 pm - 5:44 pm
LHR
-
ISP
52h 34m
2 stops
$1,367Multiple Airlines
Thu, May 14 - Sun, May 17
Multiple Airlines Logo
6:40 pm - 5:20 pm
ISP
-
LHR
41h 40m
2 stops
Multiple Airlines Logo
7:40 am - 1:39 pm
LHR
-
ISP
34h 59m
2 stops
$1,385Multiple Airlines
Thu, May 14 - Thu, May 21
Multiple Airlines Logo
2:35 pm - 3:00 pm
ISP
-
LHR
19h 25m
2 stops
Multiple Airlines Logo
9:50 am - 1:39 pm
LHR
-
ISP
32h 49m
2 stops
$1,441Multiple Airlines
Thu, May 28 - Thu, Jun 4
Multiple Airlines Logo
2:35 pm - 5:20 pm
ISP
-
LHR
21h 45m
2 stops
Multiple Airlines Logo
8:50 am - 12:28 pm
LHR
-
ISP
32h 38m
2 stops
$1,442Multiple Airlines
Fri, May 29 - Fri, Jun 5
Multiple Airlines Logo
7:25 am - 6:45 am
ISP
-
LHR
18h 20m
1 stop
Multiple Airlines Logo
8:05 pm - 11:05 am
LHR
-
ISP
20h 00m
2 stops
$1,467Multiple Airlines
Thu, May 14 - Sun, May 17
JetBlue Logo
5:00 pm - 6:30 am
ISP
-
LHR
32h 30m
2 stops
JetBlue Logo
8:15 am - 11:17 pm
LHR
-
ISP
44h 02m
2 stops
$1,516JetBlue
Fri, Jul 10 - Tue, Jul 14
Multiple Airlines Logo
12:25 pm - 9:45 pm
ISP
-
LHR
28h 20m
2 stops
Multiple Airlines Logo
8:10 pm - 11:30 am
LHR
-
ISP
44h 20m
2 stops
$1,520Multiple Airlines
Tue, Jun 16 - Sun, Jun 21
JetBlue Logo
5:00 pm - 6:30 am
ISP
-
LHR
32h 30m
2 stops
JetBlue Logo
8:15 am - 10:35 am
LHR
-
ISP
31h 20m
2 stops
$1,532JetBlue
Fri, Jul 10 - Tue, Jul 14
Multiple Airlines Logo
12:30 pm - 6:45 am
ISP
-
LHR
13h 15m
1 stop
Multiple Airlines Logo
9:40 am - 7:45 pm
LHR
-
ISP
15h 05m
1 stop
$1,538Multiple Airlines
Thu, May 7 - Thu, May 14

JetBlue flights from Islip, New York to London Heathrow Airport

Our best JetBlue deals on Islip, New York to London Heathrow Airport flight tickets
JetBlue
May 7
ISP8:59 pmIslip Long Island
52h 31m
2 stops
LHR6:30 amLondon Heathrow
May 14
LHR11:55 amLondon Heathrow
58h 49m
2 stops
ISP5:44 pmIslip Long Island
$1,194
JetBlue
Jul 10
ISP5:00 pmIslip Long Island
32h 30m
2 stops
LHR6:30 amLondon Heathrow
Jul 14
LHR8:15 amLondon Heathrow
44h 02m
2 stops
ISP11:17 pmIslip Long Island
$1,516
JetBlue
Apr 18
ISP5:15 pmIslip Long Island
35h 15m
2 stops
LHR9:30 amLondon Heathrow
Apr 25
LHR8:15 amLondon Heathrow
37h 14m
2 stops
ISP4:29 pmIslip Long Island
$1,521

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 April 14, 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 - LHR

ISPLHR

Islip Long Island

Thu 5/7

8:59 pm-6:30 am

2 stops52h 31m

London Heathrow

Thu 5/14

11:55 am-5:44 pm

2 stops58h 49m

$1,194

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

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 5/29

2:35 pm-5:20 pm

2 stops21h 45m

London Heathrow

Fri 6/5

8:50 am-12:28 pm

2 stops32h 38m

$1,442

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 5/14

7:25 am-6:45 am

1 stop18h 20m

London Heathrow

Sun 5/17

8:05 pm-11:05 am

2 stops20h 00m

$1,467

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 7/10

5:00 pm-6:30 am

2 stops32h 30m

London Heathrow

Tue 7/14

8:15 am-11:17 pm

2 stops44h 02m

$1,516

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 6/16

12:25 pm-9:45 pm

2 stops28h 20m

London Heathrow

Sun 6/21

8:10 pm-11:30 am

2 stops44h 20m

$1,520

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 7/10

5:00 pm-6:30 am

2 stops32h 30m

London Heathrow

Tue 7/14

8:15 am-10:35 am

2 stops31h 20m

$1,532
Quickest round-trip

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 5/7

12:30 pm-6:45 am

1 stop13h 15m

London Heathrow

Thu 5/14

9:40 am-7:45 pm

1 stop15h 05m

$1,538

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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 $643. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $703.

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 $619. 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 $692.

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

32h 30m

Direct flights

None
The fastest flight from Islip, New York to London Heathrow Airport takes 32h 30m
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

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 32h 30m 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
Hayes
Slough
Stratford-upon-Avon
Crawley
Wembley
Stansted
Croydon
Dartford
Brentwood
Cobham
Folkestone
Guildford
Romford
Harrow
Watford

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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