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Cheap flights from Islip, New York to London from $1,012

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 6/1. 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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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
12:35 pm - 11:55 am
ISP
-
LHR
18h 20m
2 stops
Multiple Airlines Logo
1:05 pm - 10:35 pm
LHR
-
ISP
14h 30m
2 stops
$1,230Multiple Airlines
Thu, Aug 27 - Sun, Aug 30
Multiple Airlines Logo
7:25 am - 6:30 am
ISP
-
LHR
18h 05m
2 stops
Multiple Airlines Logo
9:30 am - 7:45 pm
LHR
-
ISP
15h 15m
2 stops
$1,437Multiple Airlines
Wed, May 20 - Tue, May 26
Multiple Airlines Logo
7:25 am - 6:30 am
ISP
-
LHR
18h 05m
3 stops
Multiple Airlines Logo
9:30 am - 7:45 pm
LHR
-
ISP
15h 15m
2 stops
$1,445Multiple Airlines
Wed, May 20 - Tue, May 26
Multiple Airlines Logo
11:30 am - 4:45 pm
ISP
-
LHR
24h 15m
2 stops
Multiple Airlines Logo
7:40 am - 11:30 am
LHR
-
ISP
32h 50m
2 stops
$1,680Multiple Airlines
Mon, Jun 15 - Mon, Jun 22
Multiple Airlines Logo
11:30 am - 12:40 pm
ISP
-
LHR
20h 10m
2 stops
Multiple Airlines Logo
6:20 am - 11:30 am
LHR
-
ISP
34h 10m
2 stops
$1,681Multiple Airlines
Mon, Jun 15 - Mon, Jun 22
Multiple Airlines Logo
7:25 am - 8:00 am
ISP
-
LHR
19h 35m
1 stop
Multiple Airlines Logo
8:10 pm - 11:05 am
LHR
-
ISP
19h 55m
1 stop
$1,717Multiple Airlines
Wed, May 20 - Tue, May 26
Multiple Airlines Logo
7:25 am - 8:05 pm
ISP
-
LHR
31h 40m
3 stops
Multiple Airlines Logo
2:05 pm - 7:45 pm
LHR
-
ISP
34h 40m
2 stops
$1,795Multiple Airlines
Mon, Jun 15 - Mon, Jun 22
Multiple Airlines Logo
7:25 am - 7:10 am
ISP
-
LHR
18h 45m
1 stop
Multiple Airlines Logo
8:10 pm - 11:05 am
LHR
-
ISP
19h 55m
1 stop
$1,830Multiple Airlines
Mon, Jun 15 - Mon, Jun 22
Multiple Airlines Logo
12:30 pm - 6:45 am
ISP
-
LHR
13h 15m
1 stop
Multiple Airlines Logo
9:40 am - 4:10 pm
LHR
-
ISP
11h 30m
1 stop
$1,878Multiple Airlines
Wed, Jun 17 - Wed, Jun 24
Multiple Airlines Logo
7:25 am - 9:00 pm
ISP
-
LHR
32h 35m
2 stops
Multiple Airlines Logo
9:50 am - 7:45 pm
LHR
-
ISP
14h 55m
2 stops
$1,921Multiple Airlines
Thu, Jun 18 - Thu, Jun 25

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 May 6, 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 8/27

12:35 pm-11:55 am

2 stops18h 20m

London Heathrow

Sun 8/30

1:05 pm-10:35 pm

2 stops14h 30m

$1,230

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 5/20

7:25 am-6:30 am

2 stops18h 05m

London Heathrow

Tue 5/26

9:30 am-7:45 pm

2 stops15h 15m

$1,437

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 5/20

7:25 am-6:30 am

3 stops18h 05m

London Heathrow

Tue 5/26

9:30 am-7:45 pm

2 stops15h 15m

$1,445

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 6/15

11:30 am-4:45 pm

2 stops24h 15m

London Heathrow

Mon 6/22

7:40 am-11:30 am

2 stops32h 50m

$1,680

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 6/15

11:30 am-12:40 pm

2 stops20h 10m

London Heathrow

Mon 6/22

6:20 am-11:30 am

2 stops34h 10m

$1,681

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 5/20

7:25 am-8:00 am

1 stop19h 35m

London Heathrow

Tue 5/26

8:10 pm-11:05 am

1 stop19h 55m

$1,717

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 6/15

7:25 am-8:05 pm

3 stops31h 40m

London Heathrow

Mon 6/22

2:05 pm-7:45 pm

2 stops34h 40m

$1,795

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 6/15

7:25 am-7:10 am

1 stop18h 45m

London Heathrow

Mon 6/22

8:10 pm-11:05 am

1 stop19h 55m

$1,830
Quickest round-trip

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 6/17

12:30 pm-6:45 am

1 stop13h 15m

London Heathrow

Wed 6/24

9:40 am-4:10 pm

1 stop11h 30m

$1,878

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 6/18

7:25 am-9:00 pm

2 stops32h 35m

London Heathrow

Thu 6/25

9:50 am-7:45 pm

2 stops14h 55m

$1,921

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 $646. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $711.

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 $628. 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 $700.

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

16h 05m

Direct flights

None
The fastest flight from Islip, New York to London Heathrow Airport takes 16h 05m
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 16h 05m 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
Dover
Luton
Hayes
Stratford-upon-Avon
Crawley
Slough
Wembley
Stansted
Watford
Croydon
Uxbridge
Brentwood
Dartford
Cobham
Folkestone
Romford
Harrow

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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