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).

How far in advance should I book a flight from Islip to London?

Find a great deal and save up to 22% by booking at least 31 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Islip to London within the next two weeks, with the cheapest ticket starting at £457.

What is the cheapest month to fly from Islip to London?

Our data shows that January tends to be the cheapest month to fly to London from Islip. Users have commonly found prices around £415 for the month, but tickets can be as low as £277. Due to multiple factors, prepare for potentially higher prices in December.

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

When flying from Islip 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.

£496+ Cheap Flights from Islip to London

Cheap flight deals from Islip to London

Round-trip from	£496
Popular in	December
Cheapest in	January
Average price	£413

25/9-2/10
3 total stops
63h 20m total
Islip to London

Search Deals

High demand for flights, 4% potential price rise

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2025

Search Deals

Find flight deals from Islip to London

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 29 August 2025.

Do 25/911:40ISP - LGW

2 stops37h 40mMultiple Airlines

Do 2/1014:00LGW - ISP

1 stop25h 40mMultiple Airlines

Deal found 28/8£496

Sa 11/1016:58ISP - LGW

1 stop36h 12mMultiple Airlines

Sa 18/1013:05LGW - ISP

2 stops50h 32mMultiple Airlines

Deal found 27/8£682

Sa 11/1014:19ISP - LHR

2 stops13h 46mMultiple Airlines

Sa 18/1008:50LHR - ISP

2 stops16h 11mMultiple Airlines

Deal found 27/8£815

Do 25/914:19ISP - LHR

1 stop11h 11mMultiple Airlines

Do 2/1019:50LHR - ISP

2 stops29h 11mMultiple Airlines

Deal found 28/8£1,426

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 29 August 2025.

Do 25/911:40ISP - LGW

2 stops37h 40mMultiple Airlines

Do 2/1014:00LGW - ISP

1 stop25h 40mMultiple Airlines

Deal found 28/8£496

Sa 11/1016:58ISP - LGW

1 stop36h 12mMultiple Airlines

Sa 18/1013:05LGW - ISP

2 stops50h 32mMultiple Airlines

Deal found 27/8£682

Sa 11/1014:19ISP - LHR

2 stops13h 46mMultiple Airlines

Sa 18/1008:50LHR - ISP

2 stops16h 11mMultiple Airlines

Deal found 27/8£815

Do 25/914:19ISP - LHR

1 stop11h 11mMultiple Airlines

Do 2/1019:50LHR - ISP

2 stops29h 11mMultiple Airlines

Deal found 28/8£1,426

Last-minute flights from Islip to London
Discover last-minute flight deals from Islip to London. Data last updated 29 August 2025 and is based on user searches.

Do 25/911:40ISP - LGW

2 stops37h 40mMultiple Airlines

Do 2/1014:00LGW - ISP

1 stop25h 40mMultiple Airlines

Deal found 28/8£496

Do 25/914:19ISP - LHR

1 stop11h 11mMultiple Airlines

Do 2/1019:50LHR - ISP

2 stops29h 11mMultiple Airlines

Deal found 28/8£1,426

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 29 August 2025.

Mo 3/1116:33ISP - LHR

2 stops11h 42mMultiple Airlines

Deal found 28/8£1,118

Sa 27/914:19ISP - LHR

2 stops12h 41mMultiple Airlines

Deal found 27/8£1,121

Sa 22/1116:33ISP - LHR

2 stops11h 42mMultiple Airlines

Deal found 28/8£1,158

So 28/914:19ISP - LHR

2 stops12h 41mMultiple Airlines

Deal found 26/8£1,932

So 12/1014:19ISP - LHR

2 stops16h 31mMultiple Airlines

Deal found 28/8£3,622

Fly from

Fly to

Route

Depart

Return

Price

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Do 25/9

11:40-06:20

2 stops37h 40m

London Gatwick

Do 2/10

14:00-10:40

1 stop25h 40m

£496

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sa 11/10

16:58-10:10

1 stop36h 12m

London Gatwick

Sa 18/10

13:05-10:37

2 stops50h 32m

£682

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sa 11/10

14:19-09:05

2 stops13h 46m

London Heathrow

Sa 18/10

08:50-20:01

2 stops16h 11m

£815

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Do 25/9

14:19-06:30

1 stop11h 11m

London Heathrow

Do 2/10

19:50-20:01

2 stops29h 11m

£1,426

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mo 2/2

16:33-09:15

2 stops11h 42m

£1,118

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mo 3/11

16:33-09:15

2 stops11h 42m

£1,118

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mo 26/1

16:33-09:15

2 stops11h 42m

£1,118

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Do 27/11

16:33-09:15

2 stops11h 42m

£1,118

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

So 1/2

16:33-09:15

2 stops11h 42m

£1,118

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Di 25/11

16:33-09:15

2 stops11h 42m

£1,118

Flights are sorted by cheapest return flights first.

Deals found on 27/8

Showing 1-10 of 11 results

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.

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

What is the cheapest month to book a flight from Islip to London?

Currently, January is the cheapest month in which you can book a flight from Islip to London (average of £112). Flying from Islip to London in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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.
What is the cheapest month to book a flight from Islip to London?
Currently, January is the cheapest month in which you can book a flight from Islip to London (average of £112). Flying from Islip to London in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 to London from £496

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 25/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Islip to London

Round-trip from

Popular in

Cheapest in

Average price

Find 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 29 August 2025.

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 29 August 2025.

Cheapflights Fare Finder

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

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

What is the cheapest month to book a flight from Islip to London?

Related info for your journey

Find useful and relevant information for your journey from Islip to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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?

What is the cheapest month to book a flight from Islip to London?

Travelling to a place near London?

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Alternative routes for Islip to London

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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 29 August 2025.