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Cheap flights from Islip, New York to London from £716

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
24 Jul — 31 Jul1
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 24 June 2026.

Mon 3/810:57
ISP
-
LGW
1 stop18h 03m
Multiple Airlines
Tue 4/814:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 21/6£716
Thu 6/819:49
ISP
-
LGW
2 stops33h 11m
Multiple Airlines
Thu 13/814:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 22/6£763
Thu 23/706:00
ISP
-
LGW
2 stops46h 35m
JetBlue
Thu 30/712:20
LGW
-
ISP
2 stops27h 21m
JetBlue
Deal found 23/6£848
Thu 23/716:58
ISP
-
LHR
2 stops22h 47m
JetBlue
Thu 30/708:40
LHR
-
ISP
2 stops31h 01m
JetBlue
Deal found 23/6£864
Mon 3/806:00
ISP
-
LHR
2 stops22h 30m
JetBlue
Tue 4/811:55
LHR
-
ISP
2 stops27h 45m
JetBlue
Deal found 21/6£876
Thu 23/719:49
ISP
-
LGW
2 stops33h 11m
Multiple Airlines
Thu 30/714:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 23/6£884
Tue 13/1006:00
ISP
-
LHR
2 stops33h 45m
JetBlue
Wed 28/1009:20
LHR
-
ISP
2 stops31h 33m
JetBlue
Deal found 21/6£898
Mon 3/806:00
ISP
-
LGW
2 stops22h 35m
JetBlue
Tue 4/812:20
LGW
-
ISP
2 stops27h 20m
JetBlue
Deal found 21/6£974
Thu 23/717:50
ISP
-
LHR
2 stops13h 05m
Multiple Airlines
Thu 30/713:05
LHR
-
ISP
2 stops15h 35m
Multiple Airlines
Deal found 23/6£986
Sun 28/621:52
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Sun 5/714:00
LGW
-
ISP
1 stop24h 53m
Multiple Airlines
Deal found 23/6£1,094
Tue 13/1009:59
ISP
-
LHR
1 stop16h 11m
Multiple Airlines
Wed 28/1017:00
LHR
-
ISP
1 stop27h 10m
Multiple Airlines
Deal found 21/6£1,180
Thu 6/814:11
ISP
-
LHR
2 stops12h 54m
Multiple Airlines
Thu 13/809:50
LHR
-
ISP
2 stops15h 25m
Multiple Airlines
Deal found 22/6£1,298

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 24 June 2026.

Round-trip from

£716

Popular in

June

Cheapest in

September

Average price

£661
3/8-4/8
  • 3/8-4/8
  • 2 total stops
  • 42h 56m total
  • Islip to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£86 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 24 June 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 3/8

10:57-10:00

1 stop18h 03m

London Gatwick

Tue 4/8

14:00-09:53

1 stop24h 53m

£716

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 6/8

19:49-10:00

2 stops33h 11m

London Gatwick

Thu 13/8

14:00-09:53

1 stop24h 53m

£763

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 23/7

06:00-09:35

2 stops46h 35m

London Gatwick

Thu 30/7

12:20-10:41

2 stops27h 21m

£848

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 23/7

16:58-20:45

2 stops22h 47m

London Heathrow

Thu 30/7

08:40-10:41

2 stops31h 01m

£864

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 3/8

06:00-09:30

2 stops22h 30m

London Heathrow

Tue 4/8

11:55-10:40

2 stops27h 45m

£876

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 13/10

06:00-20:45

2 stops33h 45m

London Heathrow

Wed 28/10

09:20-12:53

2 stops31h 33m

£898

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 23/7

15:05-14:40

2 stops18h 35m

London Gatwick

Thu 30/7

15:40-23:40

2 stops37h 00m

£960

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 3/8

06:00-09:35

2 stops22h 35m

London Gatwick

Tue 4/8

12:20-10:40

2 stops27h 20m

£974

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 23/7

17:50-11:55

2 stops13h 05m

London Heathrow

Thu 30/7

13:05-23:40

2 stops15h 35m

£986

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Tue 13/10

09:59-07:10

1 stop16h 11m

London Heathrow

Wed 28/10

17:00-16:10

1 stop27h 10m

£1,180

Flights are sorted by cheapest return flights first.

Deals found on 21/6

Showing 1-10 of 12 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
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 46h 35m. JetBlue provides one of the quickest options available for as low as £848. The distance from Islip, New York to London is about 3424 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
Hounslow
Milton Keynes
Wembley
Luton
Gatwick
Croydon
Ilford
Slough
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Watford
Southall
Romford
Ipswich
Borehamwood
Folkestone
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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