In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What is the cheapest time of day to fly from ISP to LON?

When flying from Islip, New York to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly from for flights from Islip to London?

Most people fly from Islip Long Island (ISP) if they book a flight from Islip to London. On average, Long Island has 0 outbound flights to London per day from 0 airlines. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.

Can I find deals for flights from Islip to London that include hotel bookings?

Yes. In addition to deals on Islip to London flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Islip to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to London.

Can I find deals for business class flights from Islip to London?

Yes. Cheapflights offers flight deals from Islip to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£570+ Cheap Flights from Islip, New York to London

Cheap flight deals from Islip to London

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 September 2026.

Tue 3/1116:05 -

2 stops22h 25m

Tue 10/1112:15 -

2 stops14h 30m

Deal found 20/9£740

Wed 4/1116:05 -

2 stops22h 25m

Fri 13/1112:15 -

2 stops16h 20m

Deal found 17/9£741

Wed 14/1009:40 -

2 stops21h 15m

Wed 21/1021:25 -

2 stops31h 15m

Deal found 21/9£781

Tue 27/1016:20 -

2 stops14h 30m

Mon 2/1112:15 -

2 stops16h 15m

Deal found 22/9£818

Mon 23/1112:25 -

2 stops26h 05m

Thu 3/1220:35 -

2 stops30h 05m

Deal found 18/9£834

Mon 19/1015:10 -

2 stops18h 30m

Mon 26/1014:40 -

2 stops36h 00m

Deal found 19/9£851

Mon 2/1112:25 -

2 stops17h 25m

Tue 10/1112:15 -

2 stops14h 30m

Deal found 18/9£864

Tue 20/1012:50 -

2 stops18h 05m

Tue 27/1020:35 -

2 stops30h 05m

Deal found 20/9£865

Sun 1/1110:57 -

2 stops18h 53m

Sun 8/1112:15 -

2 stops31h 07m

Deal found 17/9£868

Thu 5/1112:25 -

2 stops17h 25m

Thu 12/1112:15 -

2 stops16h 20m

Deal found 21/9£869

Thu 22/1015:10 -

2 stops18h 30m

Thu 29/1011:55 -

2 stops15h 45m

Deal found 17/9£870

Fri 25/1216:05 -

2 stops13h 45m

Wed 6/120:35 -

2 stops29h 55m

Deal found 19/9£883

Best flights from Islip to London
Discover carefully curated flight deals from Islip to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 22 September 2026.

Wed 13/111:20 -

2 stops18h 30m

Tue 19/112:15 -

2 stops14h 15m

Deal found 21/9£741

Mon 1/310:55 -

2 stops18h 55m

Mon 8/320:35 -

2 stops29h 55m

Deal found 18/9£744

Thu 14/111:20 -

2 stops18h 30m

Tue 19/112:15 -

2 stops14h 15m

Deal found 20/9£779

Tue 1/1216:05 -

2 stops13h 45m

Tue 8/1220:35 -

2 stops30h 05m

Deal found 19/9£781

Wed 14/1009:40 -

2 stops21h 15m

Wed 21/1021:25 -

2 stops31h 15m

Deal found 21/9£781

Thu 18/210:55 -

2 stops18h 55m

Sun 21/220:35 -

2 stops31h 10m

Deal found 17/9£818

Thu 14/111:20 -

2 stops18h 30m

Mon 18/112:15 -

2 stops15h 30m

Deal found 20/9£835

Mon 19/1015:10 -

2 stops18h 30m

Mon 26/1014:40 -

2 stops36h 00m

Deal found 19/9£851

Fri 25/1216:05 -

2 stops13h 45m

Wed 6/120:35 -

2 stops29h 55m

Deal found 19/9£883

Tue 20/1016:20 -

2 stops17h 20m

Fri 30/1011:55 -

2 stops15h 45m

Deal found 19/9£907

Tue 20/1016:20 -

2 stops17h 20m

Wed 28/1011:55 -

2 stops14h 45m

Deal found 17/9£909

Thu 18/216:30 -

2 stops13h 25m

Sun 21/211:55 -

2 stops16h 55m

Deal found 17/9£939

Thu 22/1017:40 -

2 stops13h 15m

Thu 29/1012:15 -

2 stops15h 25m

Deal found 20/9£945

Wed 14/1009:40 -

2 stops24h 00m

Wed 21/1015:40 -

2 stops37h 00m

Deal found 21/9£1,066

Sun 1/1112:25 -

2 stops17h 30m

Sun 8/1111:55 -

2 stops16h 40m

Deal found 17/9£1,094

Tue 22/1212:10 -

2 stops17h 45m

Tue 5/111:55 -

2 stops14h 45m

Deal found 17/9£1,225

Tue 20/1016:20 -

2 stops17h 20m

Tue 27/1011:55 -

2 stops14h 45m

Deal found 20/9£1,347

Thu 22/1011:00 -

2 stops22h 40m

Thu 29/1011:55 -

2 stops15h 45m

Deal found 20/9£1,412

Wed 21/1016:20 -

2 stops17h 20m

Wed 28/1011:55 -

2 stops14h 45m

Deal found 20/9£1,475

Fri 9/1015:10 -

2 stops18h 30m

Tue 20/1015:40 -

2 stops36h 00m

Deal found 21/9£1,477

Find flight deals from Islip to London

Round-trip from	£740
One-way from	£570
Popular in	June
Cheapest in	January
Average price	£552

3/11-10/11
4 total stops
36h 55m total
Islip to London

Search Deals

19/10-31/12
2 total stops
13h 15m total
Islip to London

Search Deals

Highest demand for flights based on searches. 17% potential increase in price (£82 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 3/11

12:30-10:50

2 stops17h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£570

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 20/10

12:50-11:55

2 stops18h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£570

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Wed 25/11

16:55-19:30

2 stops21h 35m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£570

Fastest return journey

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 19/10

17:40-11:55

2 stops13h 15m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£570

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Tue 20/10

12:50-14:40

2 stops20h 50m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£570

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Mon 19/10

15:10-14:40

2 stops18h 30m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£570

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 29/9

12:55-20:20

2 stops26h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£576

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Tue 29/9

12:55-14:40

2 stops20h 45m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£576

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 22/10

15:10-11:55

2 stops15h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£603

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Fri 26/2

10:00-19:30

2 stops28h 30m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£608

Flights are sorted by cheapest return flights first.

Deals found on 21/9

Showing 1-10 of 40 resultsSorted by cheapest first

Best time to book a flight from Islip to London

Have a flexible travel schedule? Discover the best time to fly to London from Islip with our price prediction graph.

ISP-LON

ISP-LHR

ISP-LGW

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Islip to London

ISP-LON

ISP-LHR

ISP-LGW

No data available for this route at this time. Please check back soon.

Related info for your journey

What airport do you fly from for flights from Islip to London?
Most people fly from Islip Long Island (ISP) if they book a flight from Islip to London. On average, Long Island has 0 outbound flights to London per day from 0 airlines. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.
Can I find deals for flights from Islip to London that include hotel bookings?
Yes. In addition to deals on Islip to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Islip to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to London.
Can I find deals for business class flights from Islip to London?
Yes. Cheapflights offers flight deals from Islip to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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How does Cheapflights help users find flights from Islip to London?

Deals for Islip to London flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Islip to London?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Islip to London for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Islip to London with no change fees?

Certainly. Search results for flights to London from Islip shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Islip to London become cheaper?

Yes, Cheapflights offers price alerts on Islip to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from Islip, New York to London from £570

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Islip to London

Cheapest flights from Islip to LondonExplore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 September 2026.

Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 September 2026.

Best flights from Islip to LondonDiscover carefully curated flight deals from Islip to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 22 September 2026.

Discover carefully curated flight deals from Islip to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 22 September 2026.

Last-minute flights from Islip to LondonDiscover last-minute flight deals from Islip to London. Data last updated 22 September 2026 and is based on user searches.

Discover last-minute flight deals from Islip to London. Data last updated 22 September 2026 and is based on user searches.

One-way flights from Islip to LondonSearch for one-way flight options from Islip to London. Find affordable one-way fares based on user searches. Data last updated 22 September 2026.

Search for one-way flight options from Islip to London. Find affordable one-way fares based on user searches. Data last updated 22 September 2026.

Find flight deals from Islip to London

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Use the filters below to find and compare flights from Islip to London that are best for you.

Best time to book a flight from Islip to London

Have a flexible travel schedule? Discover the best time to fly to London from Islip with our price prediction graph.

Cheapflights Insights

Related info for your journey

What airport do you fly from for flights from Islip to London?

Can I find deals for flights from Islip to London that include hotel bookings?

How can I find direct flights from Islip to London?

Can I find deals for business class flights from Islip to London?

Travelling to a place near London?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to London

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Complete your trip

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Direct flights to England

Book a non-stop flight to one of these other cities located in England.

Search flights from Islip to London by cabin class

Find flights from Islip to London, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Other flights to London

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 22 September 2026.

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Browse other Islip and London flight options. Last updated on 22 September 2026.

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How does Cheapflights help users find flights from Islip to London?

Why should you use Cheapflights to find cheap flight tickets from Islip to London?

Can Cheapflights find flights from Islip to London with no change fees?

Can Cheapflights notify me if prices for flights from Islip to London become cheaper?

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Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 September 2026.

Best flights from Islip to London
Discover carefully curated flight deals from Islip to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 22 September 2026.

Last-minute flights from Islip to London
Discover last-minute flight deals from Islip to London. Data last updated 22 September 2026 and is based on user searches.

One-way flights from Islip to London
Search for one-way flight options from Islip to London. Find affordable one-way fares based on user searches. Data last updated 22 September 2026.