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Cheap flights from Islip, New York to London from £416

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 18/6. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
20 Jun — 27 Jun1
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 21 May 2026.

Thu 11/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Wed 17/614:00
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 17/5£675
Wed 17/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Tue 23/614:00
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 17/5£726
Wed 8/710:48
ISP
-
LGW
1 stop18h 12m
Multiple Airlines
Mon 13/714:00
LGW
-
ISP
2 stops31h 47m
Multiple Airlines
Deal found 19/5£761
Thu 18/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Wed 24/614:00
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 19/5£787
Fri 22/511:00
ISP
-
LGW
1 stop18h 00m
Multiple Airlines
Fri 29/514:00
LGW
-
ISP
1 stop25h 05m
Multiple Airlines
Deal found 17/5£992
Sat 13/614:22
ISP
-
LHR
2 stops25h 23m
JetBlue
Fri 19/608:15
LHR
-
ISP
2 stops29h 59m
JetBlue
Deal found 20/5£1,104
Sat 13/614:22
ISP
-
LHR
2 stops25h 23m
JetBlue
Sat 20/608:15
LHR
-
ISP
2 stops55h 25m
JetBlue
Deal found 20/5£1,126
Wed 8/715:07
ISP
-
LHR
2 stops48h 38m
JetBlue
Mon 13/708:40
LHR
-
ISP
2 stops19h 37m
JetBlue
Deal found 19/5£1,144
Fri 3/711:30
ISP
-
LHR
2 stops20h 10m
Multiple Airlines
Fri 10/706:20
LHR
-
ISP
2 stops43h 24m
Multiple Airlines
Deal found 21/5£1,162
Wed 8/710:00
ISP
-
LHR
3 stops17h 35m
Multiple Airlines
Mon 13/708:50
LHR
-
ISP
2 stops16h 25m
Multiple Airlines
Deal found 19/5£1,206
Fri 22/507:25
ISP
-
LHR
1 stop19h 35m
Multiple Airlines
Fri 29/510:05
LHR
-
ISP
1 stop11h 05m
Multiple Airlines
Deal found 17/5£1,253
Fri 22/512:25
ISP
-
LHR
2 stops40h 05m
JetBlue
Fri 29/508:15
LHR
-
ISP
2 stops33h 17m
JetBlue
Deal found 17/5£1,297

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 21 May 2026.

Round-trip from

£675

One-way from

£416

Popular in

June

Cheapest in

September

Average price

£526
11/6-17/6
  • 11/6-17/6
  • 2 total stops
  • 67h 05m total
  • Islip to London
Search Deals
18/6
  • 18/6
  • 1 total stop
  • 31h 08m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£49 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 May 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 21 May 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 17/6

21:52-10:00

1 stop31h 08m

London Gatwick

Tue 23/6

14:00-20:57

1 stop35h 57m

£726

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 8/7

10:48-10:00

1 stop18h 12m

London Gatwick

Mon 13/7

14:00-16:47

2 stops31h 47m

£761

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 18/6

21:52-07:55

2 stops29h 03m

London Gatwick

Wed 24/6

14:00-20:57

1 stop35h 57m

£881

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 8/7

15:07-09:35

2 stops37h 28m

London Gatwick

Mon 13/7

12:20-22:56

2 stops39h 36m

£1,094

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 13/6

14:22-20:45

2 stops25h 23m

London Heathrow

Fri 19/6

08:15-09:14

2 stops29h 59m

£1,104

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 13/6

14:22-20:45

2 stops25h 23m

London Heathrow

Sat 20/6

08:15-10:40

2 stops55h 25m

£1,126

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 11/6

14:11-14:40

2 stops19h 29m

London Gatwick

Wed 17/6

15:40-10:56

2 stops24h 16m

£1,157

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 3/7

11:30-12:40

2 stops20h 10m

London Heathrow

Fri 10/7

06:20-20:44

2 stops43h 24m

£1,162
Fastest return journey

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Wed 8/7

10:00-07:10

1 stop16h 10m

London Heathrow

Mon 13/7

10:05-17:41

1 stop12h 36m

£1,250

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Sat 13/6

15:05-11:45

2 stops15h 40m

London Gatwick

Sat 20/6

15:40-10:30

2 stops23h 50m

£1,337

Flights are sorted by cheapest return flights first.

Deals found on 19/5

Showing 1-10 of 22 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
No data available for this route at this time. Please check back soon.

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 25h 23m. JetBlue provides one of the quickest options available for as low as £1,104. 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.

See more FAQs

Travelling to a place near London?

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

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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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