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Cheap flights from Islip, New York to London from £687

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 28/3. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
31 Mar — 7 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Islip to London

Enter your travel dates to find the best prices.

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 1 March 2026.

Sat 28/311:50
ISP
-
LGW
2 stops18h 10m
Multiple Airlines
Sat 4/414:00
LGW
-
ISP
1 stop34h 04m
Multiple Airlines
Deal found 26/2£687
Sat 11/420:39
ISP
-
LGW
1 stop32h 21m
Multiple Airlines
Sat 18/414:00
LGW
-
ISP
2 stops52h 31m
Multiple Airlines
Deal found 25/2£788
Sun 12/409:59
ISP
-
LHR
1 stop17h 01m
Multiple Airlines
Sun 19/411:00
LHR
-
ISP
1 stop12h 44m
Multiple Airlines
Deal found 26/2£960
Tue 14/409:59
ISP
-
LHR
1 stop16h 11m
Multiple Airlines
Tue 21/411:00
LHR
-
ISP
1 stop12h 44m
Multiple Airlines
Deal found 28/2£975
Sat 28/309:59
ISP
-
LHR
1 stop16h 51m
Multiple Airlines
Sat 4/420:10
LHR
-
ISP
1 stop27h 34m
Multiple Airlines
Deal found 26/2£990
Mon 13/409:59
ISP
-
LHR
1 stop17h 01m
Multiple Airlines
Mon 20/417:35
LHR
-
ISP
1 stop30h 09m
Multiple Airlines
Deal found 26/2£1,002
Sat 28/320:22
ISP
-
LHR
2 stops29h 08m
JetBlue
Sat 4/408:40
LHR
-
ISP
2 stops18h 55m
JetBlue
Deal found 26/2£1,006
Tue 23/612:25
ISP
-
LHR
2 stops18h 30m
Multiple Airlines
Fri 11/913:05
LHR
-
ISP
2 stops14h 00m
Multiple Airlines
Deal found 28/2£1,070
Sat 11/409:59
ISP
-
LHR
1 stop16h 11m
Multiple Airlines
Sat 18/417:35
LHR
-
ISP
1 stop30h 09m
Multiple Airlines
Deal found 25/2£1,169

Find flight deals from Islip to London

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 1 March 2026.

Round-trip from

£687

Popular in

December

Cheapest in

September

Average price

£420
28/3-4/4
  • 28/3-4/4
  • 3 total stops
  • 52h 14m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£11 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Islip 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, Cheapflights users made 858,174 searches. Data last updated 1 March 2026.
Use the filters below to find and compare flights from Islip to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 28/3

11:50-10:00

2 stops18h 10m

London Gatwick

Sat 4/4

14:00-19:04

1 stop34h 04m

£687

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 11/4

20:39-10:00

1 stop32h 21m

London Gatwick

Sat 18/4

14:00-13:31

2 stops52h 31m

£788

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 12/4

09:59-08:00

1 stop17h 01m

London Heathrow

Sun 19/4

11:00-18:44

1 stop12h 44m

£960

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 28/3

09:59-06:50

1 stop16h 51m

London Heathrow

Sat 4/4

20:10-18:44

1 stop27h 34m

£990

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 28/3

20:22-05:30

2 stops29h 08m

London Heathrow

Sat 4/4

08:40-22:35

2 stops18h 55m

£1,006

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 23/6

12:25-11:55

2 stops18h 30m

London Heathrow

Fri 11/9

13:05-22:05

2 stops14h 00m

£1,070

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 13/4

09:59-08:50

2 stops17h 51m

London Heathrow

Mon 20/4

09:40-18:44

1 stop14h 04m

£1,104

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 11/4

09:59-07:10

1 stop16h 11m

London Heathrow

Sat 18/4

17:35-18:44

1 stop30h 09m

£1,169

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 14/4

09:59-06:30

1 stop15h 31m

London Heathrow

Tue 21/4

20:05-19:36

2 stops52h 31m

£1,318

Flights are sorted by cheapest return flights first.

Deals found on 26/2

Sorted 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.
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, New York to London?

Currently, April is the cheapest month in which you can book a flight from Islip, New York to London (average of £105). Flying from Islip, New York to London in June is currently the most expensive (average of £394). 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

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?

    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.

  • How long is the flight from Islip, New York to London?

    A quick flight from Islip, New York to London can take about 29h 08m. JetBlue provides one of the quickest options available for as low as £1,006. The distance from Islip, New York to London is about 3406 mi.

  • 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, New York to London?

    Currently, April is the cheapest month in which you can book a flight from Islip, New York to London (average of £105). Flying from Islip, New York to London in June is currently the most expensive (average of £394). 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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Milton Keynes
Croydon
Wembley
Luton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
Kingston upon Thames
Eastbourne
Ipswich
Chelmsford
Bedford
Romford
Folkestone

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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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