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.

£562+ 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 15 September 2026.

Mon 26/1015:10 -

2 stops15h 40m

Mon 2/1120:35 -

2 stops30h 05m

Deal found 11/9£728

Wed 11/1116:05 -

2 stops22h 25m

Mon 16/1120:35 -

2 stops30h 10m

Deal found 12/9£736

Tue 6/1016:20 -

2 stops23h 00m

Wed 14/1021:25 -

2 stops31h 15m

Deal found 11/9£737

Wed 14/1012:00 -

2 stops41h 00m

Wed 21/1014:00 -

1 stop32h 30m

Deal found 13/9£741

Tue 6/1016:20 -

2 stops17h 20m

Wed 14/1015:40 -

2 stops37h 00m

Deal found 11/9£755

Wed 28/1012:00 -

2 stops18h 55m

Wed 4/1109:50 -

1 stop36h 41m

Deal found 13/9£758

Mon 26/1017:40 -

2 stops13h 15m

Mon 2/1111:55 -

2 stops16h 35m

Deal found 11/9£764

Wed 14/1012:50 -

2 stops18h 05m

Wed 21/1021:25 -

2 stops31h 15m

Deal found 13/9£769

Sat 24/1015:50 -

2 stops15h 00m

Wed 28/1012:15 -

2 stops14h 25m

Deal found 15/9£773

Thu 15/1015:10 -

2 stops24h 10m

Mon 19/1021:25 -

2 stops30h 15m

Deal found 13/9£773

Sun 13/1212:25 -

2 stops17h 25m

Wed 23/1220:35 -

2 stops30h 05m

Deal found 13/9£780

Tue 13/1012:50 -

2 stops18h 05m

Tue 20/1013:05 -

2 stops14h 35m

Deal found 13/9£790

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 15 September 2026.

Mon 26/1015:10 -

2 stops15h 40m

Mon 2/1120:35 -

2 stops30h 05m

Deal found 11/9£728

Wed 13/111:20 -

2 stops18h 30m

Tue 19/112:15 -

2 stops14h 15m

Deal found 13/9£736

Mon 26/1017:40 -

2 stops13h 15m

Mon 2/1111:55 -

2 stops16h 35m

Deal found 11/9£764

Sun 24/111:20 -

2 stops18h 35m

Sun 31/111:55 -

2 stops15h 50m

Deal found 14/9£772

Mon 25/115:50 -

2 stops22h 40m

Mon 1/212:15 -

2 stops14h 15m

Deal found 12/9£773

Fri 12/210:00 -

2 stops28h 30m

Mon 22/220:35 -

2 stops29h 55m

Deal found 12/9£773

Thu 15/1015:10 -

2 stops24h 10m

Mon 19/1021:25 -

2 stops30h 15m

Deal found 13/9£773

Sun 13/1212:25 -

2 stops17h 25m

Wed 23/1220:35 -

2 stops30h 05m

Deal found 13/9£780

Wed 28/1009:40 -

2 stops21h 15m

Wed 4/1111:55 -

2 stops14h 50m

Deal found 13/9£790

Thu 10/1212:30 -

2 stops17h 25m

Sun 13/1211:55 -

2 stops16h 35m

Deal found 14/9£809

Thu 10/1216:05 -

2 stops13h 45m

Sun 13/1212:15 -

2 stops16h 15m

Deal found 14/9£810

Thu 11/210:00 -

2 stops19h 50m

Sun 21/220:35 -

2 stops31h 10m

Deal found 12/9£810

Wed 28/1009:40 -

2 stops21h 10m

Wed 4/1112:15 -

2 stops14h 30m

Deal found 13/9£820

Sun 13/1212:25 -

2 stops17h 30m

Wed 23/1211:55 -

2 stops16h 50m

Deal found 13/9£823

Thu 5/1112:25 -

2 stops17h 25m

Mon 9/1120:35 -

2 stops30h 10m

Deal found 14/9£836

Thu 5/1112:25 -

2 stops17h 30m

Mon 9/1111:55 -

2 stops16h 40m

Deal found 14/9£848

Thu 12/1112:25 -

2 stops17h 30m

Mon 16/1111:55 -

2 stops14h 50m

Deal found 12/9£848

Tue 13/1016:20 -

2 stops17h 20m

Tue 20/1015:40 -

2 stops36h 00m

Deal found 13/9£850

Thu 11/210:00 -

2 stops19h 55m

Sun 21/211:55 -

2 stops16h 55m

Deal found 12/9£931

Thu 22/1015:10 -

2 stops18h 30m

Mon 26/1014:40 -

2 stops36h 00m

Deal found 10/9£1,003

Sun 15/1112:25 -

2 stops17h 30m

Wed 18/1111:55 -

2 stops14h 45m

Deal found 10/9£1,068

Sat 17/1012:20 -

2 stops21h 15m

Mon 19/1015:40 -

2 stops36h 00m

Deal found 14/9£1,455

Find flight deals from Islip to London

Round-trip from	£728
One-way from	£562
Popular in	June
Cheapest in	January
Average price	£515

26/10-2/11
4 total stops
45h 45m total
Islip to London

Search Deals

30/9-31/12
2 total stops
15h 35m total
Islip to London

Search Deals

Highest demand for flights based on searches. 18% potential increase in price (£84 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£12 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

Wed 30/9

15:20-11:55

2 stops15h 35m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£562

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Mon 12/10

11:00-11:55

2 stops19h 55m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£562

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Mon 12/10

15:10-14:40

2 stops18h 30m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£562

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 13/10

12:50-11:55

2 stops18h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£565

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Tue 13/10

12:50-14:40

2 stops20h 50m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£565

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Tue 29/9

12:55-11:55

2 stops42h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£567

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Mon 28/9

10:20-14:40

2 stops23h 20m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£570

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Thu 15/10

11:00-11:55

2 stops19h 55m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£600

IslipLondon

ISP Islip Long Island - LGW London Gatwick

ISPLGW

Islip Long Island

Thu 15/10

11:00-14:40

2 stops22h 40m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£600

IslipLondon

ISP Islip Long Island - LHR London Heathrow

ISPLHR

Islip Long Island

Sat 3/10

12:20-11:55

2 stops18h 35m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£602

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 38 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 £562

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 30/9. 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 15 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 15 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 15 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 15 September 2026.

Last-minute flights from Islip to LondonDiscover last-minute flight deals from Islip to London. Data last updated 15 September 2026 and is based on user searches.

Discover last-minute flight deals from Islip to London. Data last updated 15 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 15 September 2026.

Search for one-way flight options from Islip to London. Find affordable one-way fares based on user searches. Data last updated 15 September 2026.

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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

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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

Complete your trip to London by adding a car hire and/or hotel booking to your travel itinerary.

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 15 September 2026.

Islip and London flights

Browse other Islip and London flight options. Last updated on 15 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 15 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 15 September 2026.

Last-minute flights from Islip to London
Discover last-minute flight deals from Islip to London. Data last updated 15 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 15 September 2026.