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Cheap flights from Islip, New York to London from $368

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 9/14. 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 am-
17h 08m
Multiple Airlines Logo
2:00 pm - 4:58 pm-
31h 58m
$768Multiple Airlines
Mon, Sep 14 - Mon, Sep 21
Multiple Airlines Logo
9:39 am - 10:00 am-
19h 21m
Multiple Airlines Logo
2:00 pm - 4:58 pm-
31h 58m
$775Multiple Airlines
Mon, Sep 14 - Mon, Sep 21
Multiple Airlines Logo
11:20 am - 7:30 pm-
27h 10m
Multiple Airlines Logo
12:15 pm - 9:30 pm-
14h 15m
$989Multiple Airlines
Wed, Jan 20 - Tue, Jan 26
Multiple Airlines Logo
5:43 pm - 10:00 am-
35h 17m
Multiple Airlines Logo
2:00 pm - 11:20 am-
26h 20m
$1,039Multiple Airlines
Fri, Sep 18 - Fri, Sep 25
Multiple Airlines Logo
11:20 am - 10:50 am-
18h 30m
Multiple Airlines Logo
12:15 pm - 10:20 pm-
15h 05m
$1,040Multiple Airlines
Tue, Jan 19 - Sat, Jan 23
Multiple Airlines Logo
12:30 pm - 10:55 am-
17h 25m
Multiple Airlines Logo
11:55 am - 11:50 pm-
16h 55m
$1,041Multiple Airlines
Tue, Nov 3 - Wed, Nov 25
Multiple Airlines Logo
12:30 pm - 10:50 am-
17h 20m
Multiple Airlines Logo
12:15 pm - 11:50 pm-
16h 35m
$1,042Multiple Airlines
Tue, Nov 3 - Wed, Nov 25
Multiple Airlines Logo
5:43 pm - 10:00 am-
35h 17m
Multiple Airlines Logo
2:00 pm - 4:58 pm-
31h 58m
$1,044Multiple Airlines
Fri, Sep 18 - Fri, Sep 25
Multiple Airlines Logo
12:45 pm - 8:20 pm-
26h 35m
Multiple Airlines Logo
1:05 pm - 11:35 pm-
15h 30m
$1,046Multiple Airlines
Sun, Sep 27 - Fri, Oct 9
Multiple Airlines Logo
4:05 pm - 2:40 pm-
17h 35m
Multiple Airlines Logo
3:40 pm - 10:10 pm-
35h 30m
$1,055Multiple Airlines
Thu, Sep 17 - Thu, Sep 24

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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 4, 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 - LGW

ISPLGW

Islip Long Island

Mon 9/14

11:52 am-10:00 am

2 stops17h 08m

London Gatwick

Mon 9/21

2:00 pm-4:58 pm

1 stop31h 58m

$768

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 9/14

9:39 am-10:00 am

2 stops19h 21m

London Gatwick

Mon 9/21

2:00 pm-4:58 pm

1 stop31h 58m

$775

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 1/20

11:20 am-7:30 pm

2 stops27h 10m

London Heathrow

Tue 1/26

12:15 pm-9:30 pm

2 stops14h 15m

$989

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 9/18

5:43 pm-10:00 am

1 stop35h 17m

London Gatwick

Fri 9/25

2:00 pm-11:20 am

2 stops26h 20m

$1,039
Quickest round-trip

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 1/19

11:20 am-10:50 am

2 stops18h 30m

London Heathrow

Sat 1/23

12:15 pm-10:20 pm

2 stops15h 05m

$1,040

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Tue 11/3

12:30 pm-10:55 am

2 stops17h 25m

London Gatwick

Wed 11/25

11:55 am-11:50 pm

2 stops16h 55m

$1,041

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 11/3

12:30 pm-10:50 am

2 stops17h 20m

London Heathrow

Wed 11/25

12:15 pm-11:50 pm

2 stops16h 35m

$1,042

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 9/18

5:43 pm-10:00 am

1 stop35h 17m

London Gatwick

Fri 9/25

2:00 pm-4:58 pm

1 stop31h 58m

$1,044

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 9/27

12:45 pm-8:20 pm

2 stops26h 35m

London Heathrow

Fri 10/9

1:05 pm-11:35 pm

2 stops15h 30m

$1,046

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 9/17

4:05 pm-2:40 pm

2 stops17h 35m

London Gatwick

Thu 9/24

3:40 pm-10:10 pm

2 stops35h 30m

$1,055

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 $727. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $771. 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 $715 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $776. 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

14h 50m

Direct flights

None
The fastest flight from Islip, New York to London takes 14h 50m
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 distance between Islip Long Island and London is about 3425.8 mi. In terms of flight time, this usually takes a little over 14h 50m.

  • 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
Dover
Croydon
Stansted
Kingston upon Thames
Slough
Harrow
Watford
Cobham
Richmond
Uxbridge
Worthing
Romford
Ilford
Dunstable

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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Thu 9/3
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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