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Cheap flights from Islip, New York to London from $664

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 6/18. 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.
Multiple Airlines Logo
12:35 pm - 11:55 am
ISP
-
LHR
18h 20m
2 stops
Multiple Airlines Logo
12:15 pm - 11:35 pm
LHR
-
ISP
15h 20m
2 stops
$1,090Multiple Airlines
Fri, Oct 23 - Mon, Oct 26
JetBlue Logo
2:22 pm - 8:45 pm
ISP
-
LHR
25h 23m
2 stops
JetBlue Logo
8:15 am - 9:14 am
LHR
-
ISP
29h 59m
2 stops
$1,481JetBlue
Sat, Jun 13 - Fri, Jun 19
JetBlue Logo
2:22 pm - 8:45 pm
ISP
-
LHR
25h 23m
2 stops
JetBlue Logo
8:15 am - 10:40 am
LHR
-
ISP
55h 25m
2 stops
$1,510JetBlue
Sat, Jun 13 - Sat, Jun 20
JetBlue Logo
3:07 pm - 8:45 pm
ISP
-
LHR
48h 38m
2 stops
JetBlue Logo
8:40 am - 11:17 pm
LHR
-
ISP
19h 37m
2 stops
$1,534JetBlue
Wed, Jul 8 - Mon, Jul 13
Multiple Airlines Logo
11:30 am - 12:40 pm
ISP
-
LHR
20h 10m
2 stops
Multiple Airlines Logo
6:20 am - 8:44 pm
LHR
-
ISP
43h 24m
2 stops
$1,558Multiple Airlines
Fri, Jul 3 - Fri, Jul 10
Multiple Airlines Logo
10:00 am - 8:35 am
ISP
-
LHR
17h 35m
3 stops
Multiple Airlines Logo
8:50 am - 8:15 pm
LHR
-
ISP
16h 25m
2 stops
$1,618Multiple Airlines
Wed, Jul 8 - Mon, Jul 13
Multiple Airlines Logo
11:30 am - 12:40 pm
ISP
-
LHR
20h 10m
2 stops
Multiple Airlines Logo
6:20 am - 8:44 pm
LHR
-
ISP
43h 24m
2 stops
$1,645Multiple Airlines
Fri, Jul 3 - Fri, Jul 10
Multiple Airlines Logo
10:00 am - 8:05 am
ISP
-
LHR
17h 05m
2 stops
Multiple Airlines Logo
10:05 am - 5:41 pm
LHR
-
ISP
12h 36m
1 stop
$1,676Multiple Airlines
Wed, Jul 8 - Mon, Jul 13
Multiple Airlines Logo
10:00 am - 7:10 am
ISP
-
LHR
16h 10m
1 stop
Multiple Airlines Logo
10:05 am - 5:41 pm
LHR
-
ISP
12h 36m
1 stop
$1,677Multiple Airlines
Wed, Jul 8 - Mon, Jul 13
Multiple Airlines Logo
7:00 am - 8:00 am
ISP
-
LHR
20h 00m
1 stop
Multiple Airlines Logo
10:05 am - 8:59 pm
LHR
-
ISP
15h 54m
1 stop
$1,754Multiple Airlines
Fri, Jul 3 - Fri, Jul 10

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
Jun 13
ISP2:22 pmIslip Long Island
25h 23m
2 stops
LHR8:45 pmLondon Heathrow
Jun 19
LHR8:15 amLondon Heathrow
29h 59m
2 stops
ISP9:14 amIslip Long Island
$1,481
JetBlue
Jun 13
ISP2:22 pmIslip Long Island
25h 23m
2 stops
LHR8:45 pmLondon Heathrow
Jun 20
LHR8:15 amLondon Heathrow
55h 25m
2 stops
ISP10:40 amIslip Long Island
$1,510
JetBlue
Jul 8
ISP3:07 pmIslip Long Island
48h 38m
2 stops
LHR8:45 pmLondon Heathrow
Jul 13
LHR8:40 amLondon Heathrow
19h 37m
2 stops
ISP11:17 pmIslip Long Island
$1,534

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 23, 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

Fri 10/23

12:35 pm-11:55 am

2 stops18h 20m

London Heathrow

Mon 10/26

12:15 pm-11:35 pm

2 stops15h 20m

$1,090

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 6/13

2:22 pm-8:45 pm

2 stops25h 23m

London Heathrow

Fri 6/19

8:15 am-9:14 am

2 stops29h 59m

$1,481

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 6/13

2:22 pm-8:45 pm

2 stops25h 23m

London Heathrow

Sat 6/20

8:15 am-10:40 am

2 stops55h 25m

$1,510

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 7/8

3:07 pm-8:45 pm

2 stops48h 38m

London Heathrow

Mon 7/13

8:40 am-11:17 pm

2 stops19h 37m

$1,534

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 7/3

11:30 am-12:40 pm

2 stops20h 10m

London Heathrow

Fri 7/10

6:20 am-8:44 pm

2 stops43h 24m

$1,558

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 7/8

10:00 am-8:35 am

3 stops17h 35m

London Heathrow

Mon 7/13

8:50 am-8:15 pm

2 stops16h 25m

$1,618

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 7/3

11:30 am-12:40 pm

2 stops20h 10m

London Heathrow

Fri 7/10

6:20 am-8:44 pm

2 stops43h 24m

$1,645

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 7/8

10:00 am-8:05 am

2 stops17h 05m

London Heathrow

Mon 7/13

10:05 am-5:41 pm

1 stop12h 36m

$1,676
Quickest round-trip

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 7/8

10:00 am-7:10 am

1 stop16h 10m

London Heathrow

Mon 7/13

10:05 am-5:41 pm

1 stop12h 36m

$1,677

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 7/3

7:00 am-8:00 am

1 stop20h 00m

London Heathrow

Fri 7/10

10:05 am-8:59 pm

1 stop15h 54m

$1,754

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 $653. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $718.

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 $632. 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 $709.

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

18h 20m

Direct flights

None
The fastest flight from Islip, New York to London Heathrow Airport takes 18h 20m
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 18h 20m 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
Crawley
Wembley
Stratford-upon-Avon
Slough
Croydon
Stansted
Watford
Harrow
Brentwood
Dartford
Ilford
Cobham
Folkestone
Uxbridge

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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