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Cheap flights from Islip, New York to London from £402

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 5/4. 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 return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
13:22 - 10:00
ISP
-
LGW
16h 38m
1 stop
Multiple Airlines Logo
21:05 - 18:44
LGW
-
ISP
50h 39m
2 stops
£695Multiple Airlines
Mon, 23 Mar - Mon, 30 Mar
Multiple Airlines Logo
09:59 - 09:15
ISP
-
LHR
19h 16m
2 stops
Multiple Airlines Logo
09:50 - 18:44
LHR
-
ISP
13h 54m
2 stops
£824Multiple Airlines
Thu, 26 Mar - Thu, 2 Apr
Multiple Airlines Logo
09:45 - 15:35
ISP
-
LHR
25h 50m
2 stops
Multiple Airlines Logo
20:10 - 09:09
LHR
-
ISP
41h 59m
2 stops
£830Multiple Airlines
Mon, 23 Mar - Mon, 30 Mar
Multiple Airlines Logo
09:59 - 07:00
ISP
-
LHR
17h 01m
1 stop
Multiple Airlines Logo
11:00 - 18:44
LHR
-
ISP
12h 44m
1 stop
£952Multiple Airlines
Thu, 26 Mar - Thu, 2 Apr
Multiple Airlines Logo
09:59 - 07:00
ISP
-
LHR
17h 01m
1 stop
Multiple Airlines Logo
11:00 - 18:44
LHR
-
ISP
12h 44m
1 stop
£955Multiple Airlines
Tue, 24 Mar - Tue, 31 Mar
Multiple Airlines Logo
09:59 - 06:50
ISP
-
LHR
16h 51m
1 stop
Multiple Airlines Logo
20:00 - 18:44
LHR
-
ISP
26h 44m
2 stops
£996Multiple Airlines
Sun, 8 Mar - Sun, 15 Mar
Multiple Airlines Logo
09:59 - 07:00
ISP
-
LHR
17h 01m
1 stop
Multiple Airlines Logo
11:00 - 18:44
LHR
-
ISP
12h 44m
1 stop
£997Multiple Airlines
Mon, 23 Mar - Mon, 30 Mar
Multiple Airlines Logo
19:26 - 10:00
ISP
-
LGW
34h 34m
2 stops
Multiple Airlines Logo
14:00 - 15:49
LGW
-
ISP
29h 49m
1 stop
£1,010Multiple Airlines
Sun, 15 Mar - Sat, 21 Mar
Multiple Airlines Logo
09:59 - 07:10
ISP
-
LHR
17h 11m
3 stops
Multiple Airlines Logo
06:00 - 18:44
LHR
-
ISP
17h 44m
2 stops
£1,028Multiple Airlines
Thu, 26 Mar - Thu, 2 Apr
Multiple Airlines Logo
09:59 - 06:50
ISP
-
LHR
16h 51m
1 stop
Multiple Airlines Logo
09:40 - 18:44
LHR
-
ISP
13h 04m
1 stop
£1,084Multiple Airlines
Sun, 8 Mar - Sun, 15 Mar

momondo Fare Finder

 
Customise your flight search to find flights from Islip, New York to London 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 279,928 searches. Data last updated 9 February 2026.
Use the filters below to find and compare flights from Islip, New York to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 23/3

13:22-10:00

1 stop16h 38m

London Gatwick

Mon 30/3

21:05-18:44

2 stops50h 39m

£695

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 26/3

09:59-09:15

2 stops19h 16m

London Heathrow

Thu 2/4

09:50-18:44

2 stops13h 54m

£824

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 23/3

09:45-15:35

2 stops25h 50m

London Heathrow

Mon 30/3

20:10-09:09

2 stops41h 59m

£830

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 26/3

09:59-07:00

1 stop17h 01m

London Heathrow

Thu 2/4

11:00-18:44

1 stop12h 44m

£952

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 24/3

09:59-07:00

1 stop17h 01m

London Heathrow

Tue 31/3

11:00-18:44

1 stop12h 44m

£955

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 8/3

09:59-06:50

1 stop16h 51m

London Heathrow

Sun 15/3

20:00-18:44

2 stops26h 44m

£996

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 23/3

09:59-07:00

1 stop17h 01m

London Heathrow

Mon 30/3

11:00-18:44

1 stop12h 44m

£997

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sun 15/3

19:26-10:00

2 stops34h 34m

London Gatwick

Sat 21/3

14:00-15:49

1 stop29h 49m

£1,010

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 26/3

09:59-07:10

3 stops17h 11m

London Heathrow

Thu 2/4

06:00-18:44

2 stops17h 44m

£1,028

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 8/3

09:59-06:50

1 stop16h 51m

London Heathrow

Sun 15/3

09:40-18:44

1 stop13h 04m

£1,084

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

See travel insights to London from

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

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?

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £397. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Islip, New York to London for around £452.

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

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £409. Flights in the evening are often more expensive, with an average ticket price of £433.

When to book flights from Islip, New York to London

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

Cheap Islip, New York to London (ISP to LON) flight deals and tips

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

Fastest flight time

16h 51m

Direct flights

None
The fastest flight from Islip, New York to London takes 16h 51m
There are no direct flights from Islip, New York to London. There are no popular flight routes from Islip, New York to London.
Search flight deals

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

    The straight-line distance from Islip Long Island to London is 3425.8 mi. 16h 51m is a normal flight duration for this route.

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

    Prices for flights from Islip Long Island Airport to London are updated daily.

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

    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.

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

    The necessary travel and health documents for your London 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.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Slough
Maidstone
Southend-on-Sea
Canterbury
Ipswich
Ilford
Guildford
Chelmsford
Hayes
Wembley
Dover
Folkestone
Colchester
Bedford
Worthing
Ramsgate

Why use momondo?

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

It is quick and easy to find Islip to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

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?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Islip.

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

Yes momondo offers price alerts on flights to London from Islip. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport