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Cheap flights from Islip, New York to London from £575

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
29 Apr — 6 May1
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 30 March 2026.

Sat 9/511:00
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Sat 16/514:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 28/3£765
Wed 13/511:00
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Wed 20/514:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 29/3£818
Wed 13/518:40
ISP
-
LHR
2 stops45h 05m
JetBlue
Wed 20/508:15
LHR
-
ISP
2 stops32h 20m
JetBlue
Deal found 29/3£894
Thu 9/416:30
ISP
-
LGW
2 stops17h 10m
Multiple Airlines
Thu 7/513:00
LGW
-
ISP
2 stops15h 30m
Multiple Airlines
Deal found 29/3£900
Wed 26/815:20
ISP
-
LGW
2 stops15h 25m
Multiple Airlines
Wed 2/915:40
LGW
-
ISP
2 stops35h 25m
Multiple Airlines
Deal found 25/3£901
Sun 25/1007:00
ISP
-
LHR
2 stops19h 55m
JetBlue
Sat 31/1008:05
LHR
-
ISP
2 stops32h 00m
JetBlue
Deal found 28/3£917
Sat 9/509:59
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sat 16/509:40
LHR
-
ISP
1 stop15h 05m
Multiple Airlines
Deal found 28/3£1,039
Sun 25/1007:25
ISP
-
LHR
1 stop19h 25m
Multiple Airlines
Sat 31/1009:40
LHR
-
ISP
1 stop14h 05m
Multiple Airlines
Deal found 28/3£1,041
Mon 20/417:15
ISP
-
LHR
2 stops35h 15m
JetBlue
Sat 25/411:55
LHR
-
ISP
2 stops37h 14m
JetBlue
Deal found 29/3£1,048
Wed 13/518:40
ISP
-
LHR
2 stops43h 45m
Multiple Airlines
Wed 20/508:50
LHR
-
ISP
2 stops33h 49m
Multiple Airlines
Deal found 29/3£1,060
Fri 3/417:55
ISP
-
LGW
2 stops15h 45m
Multiple Airlines
Sun 5/415:40
LGW
-
ISP
2 stops37h 15m
Multiple Airlines
Deal found 28/3£1,741

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 30 March 2026.

Round-trip from

£764

One-way from

£575

Popular in

December

Cheapest in

September

Average price

£434
9/5-16/5
  • 9/5-16/5
  • 2 total stops
  • 43h 05m total
  • Islip to London
Search Deals
15/4
  • 15/4
  • 2 total stops
  • 18h 25m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£13 potential increase over avg. return price).
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 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 30 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

Cheapest return flight

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 9/5

11:00-10:00

1 stop18h 00m

London Gatwick

Sat 16/5

10:55-11:05

2 stops29h 10m

£784

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 13/5

11:00-10:00

1 stop18h 00m

London Gatwick

Wed 20/5

14:00-10:05

1 stop25h 05m

£818

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 13/5

18:40-20:45

2 stops45h 05m

London Heathrow

Wed 20/5

08:15-11:35

2 stops32h 20m

£894

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 9/4

16:30-14:40

2 stops17h 10m

London Gatwick

Thu 7/5

13:00-23:30

2 stops15h 30m

£900

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 26/8

15:20-11:45

2 stops15h 25m

London Gatwick

Wed 2/9

15:40-22:05

2 stops35h 25m

£901

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 9/5

09:59-06:45

1 stop15h 46m

London Heathrow

Sat 16/5

09:40-19:45

1 stop15h 05m

£1,039

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 20/4

17:15-09:30

2 stops35h 15m

London Heathrow

Sat 25/4

11:55-20:09

2 stops37h 14m

£1,048
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 13/5

09:59-06:45

1 stop15h 46m

London Heathrow

Wed 20/5

09:40-16:10

1 stop11h 30m

£1,081

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 20/4

09:59-06:45

1 stop15h 46m

London Heathrow

Sat 25/4

09:40-18:44

1 stop14h 04m

£1,287

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 26/8

12:55-11:55

2 stops18h 00m

London Heathrow

Wed 2/9

21:25-22:05

2 stops29h 40m

£3,869

Flights are sorted by cheapest return flights first.

Deals found on 28/3

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

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, November is the cheapest month in which you can book a flight from Islip, New York to London (average of £213). Flying from Islip, New York to London in June is currently the most expensive (average of £403). 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 45h 05m. JetBlue provides one of the quickest options available for as low as £894. 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, November is the cheapest month in which you can book a flight from Islip, New York to London (average of £213). Flying from Islip, New York to London in June is currently the most expensive (average of £403). 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
Wembley
Croydon
Hounslow
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Eastbourne
Guildford
Watford
Kingston upon Thames
Romford
Ipswich
Bedford
Chelmsford
Bishop's Stortford

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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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