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Keflavik Intl

$686+ Cheap flights from Islip, NY (ISP) to Keflavik Intl (KEF)

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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — KEF
Sep 2 — Sep 91
Wed 9/2
Wed 9/9
1 adult, Economy
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Cheap 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 August 3, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Mon 9/142:16 pm
ISP
-
KEF
1 stop13h 54m
Multiple Airlines
Mon 9/215:10 pm
KEF
-
ISP
1 stop28h 31m
Multiple Airlines
Deal found 7/31$3,146

Find 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 August 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$3,146
(Kiwi.com)

One-way from

$686
(KAYAK)

Popular in

December

Cheapest in

January

Average price

$573
Provider with most accurate pricing for Islip Long Island-Reykjavik Keflavik Intl flight deals.
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Provider most trusted by Cheapflights users for Islip Long Island-Reykjavik Keflavik Intl flights.
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From Islip Long Island to Reykjavik Keflavik Intl
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One-way flight from Islip Long Island to Reykjavik Keflavik Intl
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Highest demand for flights based on searches. 2% potential increase in price ($13 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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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 August 3, 2026.
Use the filters below to find and compare flights from Islip to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Mon 9/14

2:16 pm-8:10 am

1 stop13h 54m

Reykjavik Keflavik Intl

Mon 9/21

5:10 pm-5:41 pm

1 stop28h 31m

$3,146
Cheapest one-way
Quickest one-way

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Tue 1/12

10:00 am-6:15 am

2 stops15h 15m

$686

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Mon 1/11

5:50 am-6:05 am

2 stops19h 15m

$776

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Mon 10/26

1:55 pm-6:10 am

2 stops36h 15m

$811

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Wed 1/13

5:50 am-6:05 am

2 stops19h 15m

$839

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Sat 1/16

10:00 am-6:15 am

2 stops15h 15m

$845

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Mon 11/9

6:00 am-6:05 am

2 stops19h 05m

$885

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Sat 11/7

6:00 am-6:05 am

2 stops19h 05m

$916

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Fri 11/6

6:00 am-6:05 am

2 stops19h 05m

$916

IslipReykjavik

ISP - KEF

ISPKEF

Islip Long Island

Thu 1/14

10:00 am-6:15 am

2 stops15h 15m

$987

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/1

Sorted by cheapest first
  • Most accurate provider: When it comes to deals on Islip, New York-Reykjavik Keflavik Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-Reykjavik Keflavik Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-Reykjavik Keflavik Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-Reykjavik Keflavik Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

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.

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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