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Keflavik Intl

$1,008+ Cheap flights from Islip (ISP) to Keflavik Intl (KEF)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — KEF
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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Cheap flight deals from Islip to Keflavik Intl

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Keflavik Intl (KEF). 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 septiembre 11, 2025.

Round-trip from

$1,008
(Kiwi.com)

Popular in

December

Cheapest in

May

Average price

$410
From Islip Long Island to Reykjavik Keflavik Intl
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Highest demand for flights based on searches. 11% potential increase in price ($63 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Islip to Keflavik Intl

Cheapest flights from Islip to Keflavik Intl
Explore the most affordable flight options available from Islip to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/267:30 amISP - KEF
1 stop10h 15mMultiple Airlines
dom. 11/29:55 amKEF - ISP
1 stop8h 29mMultiple Airlines
Deal found 9/11$1,008
This Mytrip deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/34:33 pmISP - KEF
2 stops16h 42mMultiple Airlines
mar. 12/93:20 pmKEF - ISP
2 stops33h 41mMultiple Airlines
Deal found 9/11$1,113

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Keflavik Intl 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 2,558,603 searches. Data last updated septiembre 11, 2025.
Use the filters below to find and compare flights from Islip to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

Islip

Fly to

Keflavik Intl

Route

Depart

Return

Price

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

dom. 10/26

7:30 am-9:45 pm

1 stop10h 15m

Reykjavik Keflavik Intl

dom. 11/2

9:55 am-1:24 pm

1 stop8h 29m

$1,008

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

mié. 12/3

4:33 pm-2:15 pm

2 stops16h 42m

Reykjavik Keflavik Intl

mar. 12/9

3:20 pm-8:01 pm

2 stops33h 41m

$1,113

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Best time to book a flight from Islip to Keflavik Intl

Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from Islip with our price prediction graph.
Estimated round-trip 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 Reykjavik Keflavik Intl Airport

What is the cheapest month to book a flight from Islip to Reykjavik Keflavik Intl Airport?

Currently, November is the cheapest month in which you can book a flight from Islip to Reykjavik Keflavik Intl Airport (average of $328). Flying from Islip to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $655). 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 Keflavik Intl. 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 Reykjavik Keflavik Intl?

    Islip Long Island (ISP), located 7.2 mi from the city center, is the airport you fly out of when you book flights from Islip to Reykjavik Keflavik Intl. 0 airlines have flights from Long Island to Reykjavik Keflavik Intl on a regular basis. Booking flights from Islip Long Island to Reykjavik Keflavik Intl should not be difficult; the airport handles an average of 0 outbound flights to Reykjavik Keflavik Intl per day.

  • Can I find deals for flights from Islip to Keflavik Intl that include hotel bookings?

    Yes. In addition to deals on Islip to Keflavik Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Keflavik Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Keflavik Intl.

  • Can I find deals for business class flights from Islip to Keflavik Intl?

    Yes. Cheapflights offers flight deals from Islip to Keflavik Intl 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 to Reykjavik Keflavik Intl Airport?

    Currently, November is the cheapest month in which you can book a flight from Islip to Reykjavik Keflavik Intl Airport (average of $328). Flying from Islip to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $655). 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

Traveling to a place near Reykjavik Keflavik Intl Airport?

Book flights to Reykjavik Keflavik Intl Airport if you plan to visit one of these locations
Keflavik
Hveragerdi

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