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Cheap flights from Islip, New York to London from £563

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 6/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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
17:43 - 10:00ISP  Islip Long Island-LGW London Gatwick
35h 17m1 stop Orlando
Multiple Airlines Logo
14:00 - 16:58LGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
£571Multiple Airlines
Thu, 24 Sep - Thu, 1 Oct
Multiple Airlines Logo
17:43 - 10:00ISP  Islip Long Island-LGW London Gatwick
35h 17m1 stop Orlando
Multiple Airlines Logo
14:00 - 14:22LGW  London Gatwick-ISP Islip Long Island
29h 22m2 stops Orlando Raleigh-Durham
£640Multiple Airlines
Thu, 24 Sep - Thu, 1 Oct
Multiple Airlines Logo
10:57 - 10:00ISP  Islip Long Island-LGW London Gatwick
18h 03m1 stop Orlando
Multiple Airlines Logo
14:00 - 16:58LGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
£640Multiple Airlines
Thu, 3 Sep - Wed, 9 Sep
Multiple Airlines Logo
12:00 - 10:00ISP  Islip Long Island-LGW London Gatwick
41h 00m2 stops Raleigh-Durham Orlando
Multiple Airlines Logo
14:00 - 16:58LGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
£648Multiple Airlines
Sat, 26 Sep - Sat, 3 Oct
Multiple Airlines Logo
17:43 - 10:00ISP  Islip Long Island-LGW London Gatwick
35h 17m1 stop Orlando
Multiple Airlines Logo
14:00 - 16:58LGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
£670Multiple Airlines
Thu, 10 Sep - Wed, 16 Sep
Multiple Airlines Logo
17:43 - 10:00ISP  Islip Long Island-LGW London Gatwick
35h 17m1 stop Orlando
Multiple Airlines Logo
14:00 - 16:58LGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
£685Multiple Airlines
Sat, 26 Sep - Sat, 3 Oct
Multiple Airlines Logo
10:57 - 10:00ISP  Islip Long Island-LGW London Gatwick
18h 03m1 stop Orlando
Multiple Airlines Logo
14:00 - 19:05LGW  London Gatwick-ISP Islip Long Island
34h 05m2 stops Orlando Norfolk
£701Multiple Airlines
Thu, 3 Sep - Wed, 9 Sep
Multiple Airlines Logo
17:43 - 07:55ISP  Islip Long Island-LGW London Gatwick
33h 12m2 stops Orlando Ottawa
Multiple Airlines Logo
14:00 - 16:58LGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
£712Multiple Airlines
Thu, 10 Sep - Wed, 16 Sep
Multiple Airlines Logo
12:25 - 19:30ISP  Islip Long Island-LHR London Heathrow
26h 05m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 - 21:40LHR  London Heathrow-ISP Islip Long Island
14h 25m2 stops Reykjavik Keflavik Intl Baltimore/Washington
£735Multiple Airlines
Sun, 8 Nov - Tue, 17 Nov
Multiple Airlines Logo
09:40 - 20:20ISP  Islip Long Island-LHR London Heathrow
29h 40m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
21:25 - 22:35LHR  London Heathrow-ISP Islip Long Island
30h 10m2 stops Reykjavik Keflavik Intl Baltimore/Washington
£736Multiple Airlines
Tue, 6 Oct - Mon, 12 Oct

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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 14 August 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

Cheapest return flight

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 24/9

17:43-10:00

1 stop35h 17m

London Gatwick

Thu 1/10

14:00-16:58

1 stop31h 58m

£571

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 24/9

17:43-10:00

1 stop35h 17m

London Gatwick

Thu 1/10

14:00-14:22

2 stops29h 22m

£640

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 3/9

10:57-10:00

1 stop18h 03m

London Gatwick

Wed 9/9

14:00-16:58

1 stop31h 58m

£640

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Sat 26/9

12:00-10:00

2 stops41h 00m

London Gatwick

Sat 3/10

14:00-16:58

1 stop31h 58m

£648

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 10/9

17:43-10:00

1 stop35h 17m

London Gatwick

Wed 16/9

14:00-16:58

1 stop31h 58m

£670

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Sat 26/9

17:43-10:00

1 stop35h 17m

London Gatwick

Sat 3/10

14:00-16:58

1 stop31h 58m

£685

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 3/9

10:57-10:00

1 stop18h 03m

London Gatwick

Wed 9/9

14:00-19:05

2 stops34h 05m

£701

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 10/9

17:43-07:55

2 stops33h 12m

London Gatwick

Wed 16/9

14:00-16:58

1 stop31h 58m

£712
Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sun 8/11

12:25-19:30

2 stops26h 05m

London Heathrow

Tue 17/11

12:15-21:40

2 stops14h 25m

£735

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 6/10

09:40-20:20

2 stops29h 40m

London Heathrow

Mon 12/10

21:25-22:35

2 stops30h 10m

£736

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 £428. 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 £523.

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 £454. Flights in the evening are often more expensive, with an average ticket price of £490.

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

13h 45m

Direct flights

None
The fastest flight from Islip, New York to London takes 13h 45m
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

Frequently asked questions about flying from Islip, New York to London

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

    The straight-line distance from Islip Long Island to London is 3425.8 mi. 13h 45m 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
Wembley
Gatwick
Milton Keynes
Luton
Southend-on-Sea
Slough
Ipswich
Maidstone
Folkestone
Ilford
Hastings
Canterbury
Chichester
Hayes
Guildford
Bedford
Harlow
Colchester
Chelmsford

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