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Cheap flights from Islip, New York to London from £588

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 25/4. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
12 Apr — 19 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 13 March 2026.

Sat 25/411:50
ISP
-
LGW
2 stops41h 10m
Multiple Airlines
Sat 2/514:00
LGW
-
ISP
1 stop24h 13m
Multiple Airlines
Deal found 11/3£588
Wed 22/411:50
ISP
-
LGW
2 stops17h 10m
Multiple Airlines
Wed 29/414:00
LGW
-
ISP
1 stop24h 33m
Multiple Airlines
Deal found 8/3£738
Mon 27/416:30
ISP
-
LGW
2 stops17h 10m
Multiple Airlines
Mon 11/515:40
LGW
-
ISP
2 stops35h 30m
Multiple Airlines
Deal found 11/3£746
Tue 7/416:05
ISP
-
LHR
2 stops14h 50m
Multiple Airlines
Tue 14/413:05
LHR
-
ISP
2 stops14h 05m
Multiple Airlines
Deal found 12/3£752
Mon 27/416:30
ISP
-
LHR
2 stops14h 25m
Multiple Airlines
Mon 11/513:05
LHR
-
ISP
2 stops15h 25m
Multiple Airlines
Deal found 11/3£801
Thu 23/409:59
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Thu 30/410:50
LHR
-
ISP
2 stops27h 23m
Multiple Airlines
Deal found 9/3£817
Thu 8/1011:35
ISP
-
LHR
2 stops28h 10m
JetBlue
Mon 19/1011:55
LHR
-
ISP
2 stops27h 55m
JetBlue
Deal found 12/3£867
Thu 9/420:36
ISP
-
LGW
1 stop32h 24m
Multiple Airlines
Thu 16/413:05
LGW
-
ISP
2 stops25h 08m
Multiple Airlines
Deal found 12/3£978
Sat 25/409:59
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sat 2/509:40
LHR
-
ISP
1 stop11h 30m
Multiple Airlines
Deal found 11/3£1,016
Mon 27/417:25
ISP
-
LHR
2 stops40h 35m
Multiple Airlines
Mon 4/520:10
LHR
-
ISP
2 stops49h 20m
Multiple Airlines
Deal found 12/3£1,028
Wed 22/409:59
ISP
-
LHR
1 stop16h 11m
Multiple Airlines
Wed 29/417:35
LHR
-
ISP
1 stop22h 30m
Multiple Airlines
Deal found 8/3£1,055
Thu 9/409:59
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Thu 16/409:40
LHR
-
ISP
1 stop14h 04m
Multiple Airlines
Deal found 12/3£1,100

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 13 March 2026.

Round-trip from

£588

Popular in

December

Cheapest in

September

Average price

£422
25/4-2/5
  • 25/4-2/5
  • 3 total stops
  • 65h 23m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£14 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 13 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

Wed 22/4

11:50-10:00

2 stops17h 10m

London Gatwick

Wed 29/4

14:00-09:33

1 stop24h 33m

£738

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 27/4

16:30-14:40

2 stops17h 10m

London Gatwick

Mon 11/5

15:40-22:10

2 stops35h 30m

£746

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 7/4

16:05-11:55

2 stops14h 50m

London Heathrow

Tue 14/4

13:05-22:10

2 stops14h 05m

£752

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 27/4

16:30-11:55

2 stops14h 25m

London Heathrow

Mon 11/5

13:05-23:30

2 stops15h 25m

£801

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 23/4

09:59-06:45

1 stop15h 46m

London Heathrow

Thu 30/4

10:50-09:13

2 stops27h 23m

£817

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 9/4

20:36-10:00

1 stop32h 24m

London Gatwick

Thu 16/4

13:05-09:13

2 stops25h 08m

£978
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 25/4

09:59-06:45

1 stop15h 46m

London Heathrow

Sat 2/5

09:40-16:10

1 stop11h 30m

£1,016

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 27/4

17:25-15:00

2 stops40h 35m

London Heathrow

Mon 4/5

20:10-16:30

2 stops49h 20m

£1,028

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 22/4

09:59-07:10

1 stop16h 11m

London Heathrow

Wed 29/4

17:35-11:05

1 stop22h 30m

£1,055

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 9/4

09:59-06:45

1 stop15h 46m

London Heathrow

Thu 16/4

09:40-18:44

1 stop14h 04m

£1,100

Flights are sorted by cheapest return flights first.

Deals found on 9/3

Showing 1-10 of 19 resultsSorted by cheapest first
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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 £211). Flying from Islip, New York to London in June is currently the most expensive (average of £399). 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.

  • 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 £211). Flying from Islip, New York to London in June is currently the most expensive (average of £399). 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
Luton
Hounslow
Slough
Gatwick
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Chelmsford
Eastbourne
Ipswich
Bedford
Romford
Southend-on-Sea

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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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