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Cheap flights from London to New York from $1,944

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from London to New York departing on 9/1. 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 London to New York

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:50 pm - 8:15 pmLHR  London Heathrow-ISP Islip Long Island
29h 25m2 stops Lisbon Humberto Delgado Boston Logan Intl
Multiple Airlines Logo
10:05 am - 6:30 amISP  Islip Long Island-LHR London Heathrow
15h 25m1 stop Boston Logan Intl
$1,944Multiple Airlines
Tue, Sep 1 - Wed, Sep 30
Multiple Airlines Logo
8:40 am - 5:41 pmLHR  London Heathrow-ISP Islip Long Island
14h 01m1 stop Boston Logan Intl
Multiple Airlines Logo
10:05 am - 6:30 amISP  Islip Long Island-LHR London Heathrow
15h 25m1 stop Boston Logan Intl
$2,476Multiple Airlines
Tue, Sep 1 - Wed, Sep 30
Multiple Airlines Logo
9:50 am - 8:15 pmLHR  London Heathrow-ISP Islip Long Island
15h 25m2 stops Dublin Boston Logan Intl
Multiple Airlines Logo
10:05 am - 8:05 amISP  Islip Long Island-LHR London Heathrow
17h 00m2 stops Boston Logan Intl Dublin
$4,600Multiple Airlines
Tue, Sep 1 - Wed, Sep 30

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momondo Fare Finder

 
Customize your flight search to find flights from London to Islip, New York 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 8, 2026.
Use the filters below to find and compare flights from London to Islip, New York that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Tue 9/1

7:50 pm-8:15 pm

2 stops29h 25m

Islip Long Island

Wed 9/30

10:05 am-6:30 am

1 stop15h 25m

$1,944
Quickest round-trip

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Tue 9/1

8:40 am-5:41 pm

1 stop14h 01m

Islip Long Island

Wed 9/30

10:05 am-6:30 am

1 stop15h 25m

$2,476

LondonIslip

LHR London Heathrow - ISP Islip Long Island

LHRISP

London Heathrow

Tue 9/1

9:50 am-8:15 pm

2 stops15h 25m

Islip Long Island

Wed 9/30

10:05 am-8:05 am

2 stops17h 00m

$4,600

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to New York from

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

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 airlines fly to Islip, New York?

British Airways, Virgin Atlantic and Lufthansa are the top three most popular airlines that fly to Islip, New York from London according to our data. British Airways is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Islip, New York. Keep in mind that there are 17 different airlines that fly to Islip, New York on a routine basis, so you have a few additional options to choose from.

When to book flights from London to Islip, New York

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

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

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

Fastest flight time

29h 25m

Direct flights

None
The fastest flight from London to Islip, New York takes 29h 25m
There are no direct flights from London to Islip, New York. There are no popular flight routes from London to Islip, New York.
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Frequently asked questions about flying from London to Islip, New York

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

    A flight from London to Islip Long Island will travel around 3425.8 mi. By plane, this route typically takes 29h 25m.

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

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Islip Long Island Airport.

  • What documentation or ID do you need to fly to Islip Long Island Airport?

    The travel and health documents you'll need for your trip to Islip Long Island Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Islip Long Island Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Traveling to a place near New York?

Book flights to New York if you plan to visit one of these locations
Montauk
Riverhead
Southampton
Sag Harbor
Amagansett

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Islip for you.

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

Yes. momondo allows you to filter the results for London to Islip flights to just show those with flexible booking policies.

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

Once you have performed a search for London to Islip flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to Islip from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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