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Cheap flights from Islip, New York to London from £582

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 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
4 May — 11 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 4 April 2026.

Sun 25/1011:10
ISP
-
LHR
2 stops42h 20m
JetBlue
Sat 31/1009:20
LHR
-
ISP
2 stops29h 54m
JetBlue
Deal found 31/3£911
Thu 14/520:59
ISP
-
LHR
2 stops28h 31m
JetBlue
Sun 17/511:55
LHR
-
ISP
2 stops61h 09m
JetBlue
Deal found 2/4£1,008
Sun 25/1012:30
ISP
-
LHR
1 stop14h 20m
Multiple Airlines
Sat 31/1009:40
LHR
-
ISP
1 stop14h 05m
Multiple Airlines
Deal found 3/4£1,026
Mon 6/715:05
ISP
-
LGW
2 stops15h 40m
Multiple Airlines
Tue 21/715:40
LGW
-
ISP
2 stops35h 55m
Multiple Airlines
Deal found 3/4£1,057
Thu 14/509:59
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sun 17/509:40
LHR
-
ISP
1 stop11h 30m
Multiple Airlines
Deal found 2/4£1,063
Thu 14/509:59
ISP
-
LGW
2 stops23h 41m
Multiple Airlines
Sun 17/518:35
LGW
-
ISP
2 stops30h 10m
Multiple Airlines
Deal found 2/4£1,067
Fri 15/507:25
ISP
-
LHR
1 stop18h 20m
Multiple Airlines
Fri 22/509:40
LHR
-
ISP
1 stop30h 25m
Multiple Airlines
Deal found 31/3£1,081
Mon 6/715:05
ISP
-
LHR
2 stops15h 50m
Multiple Airlines
Tue 21/721:25
LHR
-
ISP
2 stops30h 10m
Multiple Airlines
Deal found 3/4£1,122
Fri 15/511:00
ISP
-
LGW
2 stops42h 45m
Multiple Airlines
Fri 22/514:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 31/3£1,126
Sun 17/509:59
ISP
-
LHR
1 stop15h 46m
Multiple Airlines
Sun 24/509:40
LHR
-
ISP
1 stop11h 30m
Multiple Airlines
Deal found 2/4£1,150
Wed 15/409:59
ISP
-
LGW
2 stops17h 26m
Multiple Airlines
Thu 23/409:25
LGW
-
ISP
2 stops14h 19m
Multiple Airlines
Deal found 3/4£1,924

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 4 April 2026.

Round-trip from

£1,008

One-way from

£582

Popular in

December

Cheapest in

September

Average price

£440
JetBlue
  • JetBlue
  • 14/5-17/5
  • 4 total stops
  • 89h 40m total
  • Islip to London
Search Deals
6/5
  • 6/5
  • 2 total stops
  • 21h 45m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£12 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 April 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 4 April 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

Mon 6/7

15:05-11:45

2 stops15h 40m

London Gatwick

Tue 21/7

15:40-22:35

2 stops35h 55m

£1,057

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 14/5

09:59-14:40

2 stops23h 41m

London Gatwick

Sun 17/5

18:35-19:45

2 stops30h 10m

£1,067

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 15/5

07:25-06:45

1 stop18h 20m

London Heathrow

Fri 22/5

09:40-11:05

1 stop30h 25m

£1,081

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 6/7

15:05-11:55

2 stops15h 50m

London Heathrow

Tue 21/7

21:25-22:35

2 stops30h 10m

£1,122

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 15/5

11:00-10:45

2 stops42h 45m

London Gatwick

Fri 22/5

14:00-10:05

1 stop25h 05m

£1,126
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 15/4

09:59-06:45

1 stop15h 46m

London Heathrow

Thu 23/4

09:40-18:44

1 stop14h 04m

£1,380

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sun 17/5

18:40-17:20

2 stops41h 40m

London Heathrow

Sun 24/5

18:10-13:39

2 stops48h 29m

£1,451

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 15/4

09:59-08:25

2 stops17h 26m

London Gatwick

Thu 23/4

09:25-18:44

2 stops14h 19m

£1,924

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 14/5

09:59-06:50

2 stops15h 51m

London Heathrow

Sun 17/5

08:15-19:45

2 stops16h 30m

£4,616
Cheapest one-way

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 6/5

09:00-11:45

2 stops21h 45m

£582

Flights are sorted by cheapest return flights first.

Deals found on 4/4

Showing 1-10 of 14 resultsSorted by cheapest first
1
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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 £213). Flying from Islip, New York to London in June is currently the most expensive (average of £404). 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 £213). Flying from Islip, New York to London in June is currently the most expensive (average of £404). 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
Gatwick
Luton
Ilford
Slough
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Romford
Eastbourne
Chelmsford
Ipswich
Southend-on-Sea
Guildford
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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