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Cheap flights from Islip, New York to London from $488

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 9/5. 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 round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:52 am - 10:00 amISP  Islip Long Island-LGW London Gatwick
17h 08m2 stops Raleigh-Durham Orlando
Multiple Airlines Logo
2:00 pm - 4:58 pmLGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
$855Multiple Airlines
Mon, Sep 28 - Mon, Oct 5
Multiple Airlines Logo
5:43 pm - 10:00 amISP  Islip Long Island-LGW London Gatwick
35h 17m1 stop Orlando
Multiple Airlines Logo
2:00 pm - 5:30 pmLGW  London Gatwick-ISP Islip Long Island
32h 30m1 stop Orlando
$869Multiple Airlines
Wed, Sep 30 - Wed, Oct 7
Multiple Airlines Logo
12:00 pm - 10:00 amISP  Islip Long Island-LGW London Gatwick
41h 00m2 stops Raleigh-Durham Orlando
Multiple Airlines Logo
2:00 pm - 4:58 pmLGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
$874Multiple Airlines
Sat, Sep 26 - Sat, Oct 3
Multiple Airlines Logo
5:43 pm - 10:00 amISP  Islip Long Island-LGW London Gatwick
35h 17m1 stop Orlando
Multiple Airlines Logo
2:00 pm - 4:58 pmLGW  London Gatwick-ISP Islip Long Island
31h 58m1 stop Orlando
$924Multiple Airlines
Sat, Sep 26 - Sat, Oct 3
Multiple Airlines Logo
12:00 pm - 10:00 amISP  Islip Long Island-LGW London Gatwick
17h 00m2 stops Raleigh-Durham Orlando
Multiple Airlines Logo
2:00 pm - 5:30 pmLGW  London Gatwick-ISP Islip Long Island
32h 30m1 stop Orlando
$980Multiple Airlines
Wed, Sep 30 - Wed, Oct 7
Multiple Airlines Logo
4:20 pm - 11:55 amISP  Islip Long Island-LHR London Heathrow
14h 35m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
1:05 pm - 10:35 pmLHR  London Heathrow-ISP Islip Long Island
14h 30m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$992Multiple Airlines
Tue, Oct 13 - Tue, Oct 20
Multiple Airlines Logo
12:50 pm - 2:40 pmISP  Islip Long Island-LGW London Gatwick
20h 50m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
3:40 pm - 10:35 pmLGW  London Gatwick-ISP Islip Long Island
35h 55m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$992Multiple Airlines
Tue, Oct 13 - Tue, Oct 20
Multiple Airlines Logo
12:25 pm - 10:50 amISP  Islip Long Island-LHR London Heathrow
17h 25m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
8:35 pm - 9:40 pmLHR  London Heathrow-ISP Islip Long Island
30h 05m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$993Multiple Airlines
Mon, Nov 2 - Mon, Nov 9
Multiple Airlines Logo
12:50 pm - 11:55 amISP  Islip Long Island-LHR London Heathrow
18h 05m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
8:35 pm - 11:35 pmLHR  London Heathrow-ISP Islip Long Island
31h 00m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$994Multiple Airlines
Wed, Oct 21 - Thu, Oct 29
Multiple Airlines Logo
3:20 pm - 11:45 amISP  Islip Long Island-LGW London Gatwick
15h 25m2 stops Baltimore/Washington Reykjavik Keflavik Intl
Multiple Airlines Logo
3:40 pm - 10:10 pmLGW  London Gatwick-ISP Islip Long Island
35h 30m2 stops Reykjavik Keflavik Intl Baltimore/Washington
$1,007Multiple Airlines
Wed, Sep 9 - Thu, Sep 17

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momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated August 17, 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 round-trip

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Mon 9/28

11:52 am-10:00 am

2 stops17h 08m

London Gatwick

Mon 10/5

2:00 pm-4:58 pm

1 stop31h 58m

$855

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Wed 9/30

5:43 pm-10:00 am

1 stop35h 17m

London Gatwick

Wed 10/7

2:00 pm-5:30 pm

1 stop32h 30m

$869

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Sat 9/26

12:00 pm-10:00 am

2 stops41h 00m

London Gatwick

Sat 10/3

2:00 pm-4:58 pm

1 stop31h 58m

$874

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Sat 9/26

5:43 pm-10:00 am

1 stop35h 17m

London Gatwick

Sat 10/3

2:00 pm-4:58 pm

1 stop31h 58m

$924

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Wed 9/30

12:00 pm-10:00 am

2 stops17h 00m

London Gatwick

Wed 10/7

2:00 pm-5:30 pm

1 stop32h 30m

$980
Quickest round-trip

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 10/13

4:20 pm-11:55 am

2 stops14h 35m

London Heathrow

Tue 10/20

1:05 pm-10:35 pm

2 stops14h 30m

$992

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Tue 10/13

12:50 pm-2:40 pm

2 stops20h 50m

London Gatwick

Tue 10/20

3:40 pm-10:35 pm

2 stops35h 55m

$992

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 11/2

12:25 pm-10:50 am

2 stops17h 25m

London Heathrow

Mon 11/9

8:35 pm-9:40 pm

2 stops30h 05m

$993

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 10/21

12:50 pm-11:55 am

2 stops18h 05m

London Heathrow

Thu 10/29

8:35 pm-11:35 pm

2 stops31h 00m

$994

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Wed 9/9

3:20 pm-11:45 am

2 stops15h 25m

London Gatwick

Thu 9/17

3:40 pm-10:10 pm

2 stops35h 30m

$1,007

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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

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?

The cheapest day to depart from Islip, New York to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $740. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $783. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Islip, New York in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $723 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $782. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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 round-trip 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 00m

Direct flights

None
The fastest flight from Islip, New York to London takes 13h 00m
There are no direct flights from Islip, New York to London. There are no popular flight routes from Islip, New York to London.
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Frequently asked questions about flying from Islip, New York to London

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

    The distance between Islip Long Island and London is about 3425.8 mi. In terms of flight time, this usually takes a little over 13h 00m.

  • 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 refreshed on a daily basis.

  • 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.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Hayes
Wembley
Croydon
Dover
Stansted
Richmond
Kingston upon Thames
Harrow
Watford
Cobham
Slough
Uxbridge
Worthing
Romford
Ilford
Bedford

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Islip to London. momondo saves you time and could save you money on your trip.

Can I find flights from Islip to London with flexible booking policies on momondo?

All flight searches from Islip to London on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Islip to London.

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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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