In terms of precipitation, rainfall in Reykjavik Keflavik Intl Airport ranges from 1.6 - 3.1 inches per month. January is typically the wettest month, when rainfall can reach 3.1 in. May is typically the driest time to visit Reykjavik Keflavik Intl Airport when rainfall is around 1.6 in.

If weather is an important factor for your trip to Reykjavik Keflavik Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 51.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What is the cheapest time of day to fly from ISP to KEF?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip, New York to Reykjavik Keflavik Intl Airport as you normally would.

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.

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.

$1,314+ Cheap Flights from Islip, NY to Reykjavik Keflavik Intl Airport

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Cheap flight deals from Islip to Keflavik Intl

Best

Best flights from Islip to Keflavik Intl
Discover carefully curated flight deals from Islip to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 5, 2026.

Wed 1/201:36 pm -

2 stops35h 34m

Thu 1/284:50 pm -

2 stops34h 06m

Deal found 11/1

$1,314

Thu 1/211:36 pm -

2 stops35h 34m

Mon 1/254:50 pm -

2 stops34h 06m

Deal found 11/1

$1,314

Thu 1/211:36 pm -

2 stops35h 34m

Tue 1/265:00 pm -

2 stops33h 56m

Deal found 11/1

$1,322

Tue 2/91:36 pm -

2 stops35h 54m

Tue 2/165:15 pm -

1 stop20h 20m

Deal found 11/3

$1,335

Mon 2/81:36 pm -

2 stops35h 39m

Sun 2/145:15 pm -

1 stop20h 20m

Deal found 11/3

$1,338

Thu 1/211:36 pm -

2 stops35h 34m

Wed 1/275:00 pm -

2 stops33h 56m

Deal found 11/1

$1,356

Wed 1/201:36 pm -

2 stops35h 34m

Wed 1/275:00 pm -

2 stops33h 56m

Deal found 11/1

$1,356

Sun 1/246:00 am -

2 stops19h 10m

Fri 1/295:15 pm -

1 stop24h 31m

Deal found 11/1

$1,364

Tue 4/69:45 am -

2 stops19h 10m

Sun 4/114:45 pm -

2 stops33h 12m

Deal found 11/2

$1,399

Sun 2/71:36 pm -

2 stops35h 34m

Tue 2/165:15 pm -

1 stop20h 20m

Deal found 11/3

$1,401

Sun 4/49:45 am -

1 stop19h 40m

Fri 4/94:45 pm -

2 stops24h 45m

Deal found 11/2

$1,435

Sun 2/71:36 pm -

2 stops35h 34m

Thu 2/185:15 pm -

1 stop20h 20m

Deal found 11/3

$1,447

Find flight deals from Islip to Keflavik Intl

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$1,272 (KAYAK)
Popular in	December
Cheapest in	January
Average price	$628

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.

Search Deals

From Islip Long Island to Reykjavik Keflavik Intl

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($43 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 2026

Search Deals

Cheapflights Fare Finder

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

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Wed 1/20

1:36 pm-6:10 am

2 stops35h 34m

Reykjavik Keflavik Intl

Thu 1/28

4:50 pm-9:56 pm

2 stops34h 06m

$1,314

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Thu 1/21

1:36 pm-6:10 am

2 stops35h 34m

Reykjavik Keflavik Intl

Mon 1/25

4:50 pm-9:56 pm

2 stops34h 06m

$1,314

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Thu 1/21

1:36 pm-6:10 am

2 stops35h 34m

Reykjavik Keflavik Intl

Tue 1/26

5:00 pm-9:56 pm

2 stops33h 56m

$1,322

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Tue 2/9

1:36 pm-6:30 am

2 stops35h 54m

Reykjavik Keflavik Intl

Tue 2/16

5:15 pm-8:35 am

1 stop20h 20m

$1,335

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Mon 2/8

1:36 pm-6:15 am

2 stops35h 39m

Reykjavik Keflavik Intl

Sun 2/14

5:15 pm-8:35 am

1 stop20h 20m

$1,338

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Thu 1/21

1:36 pm-6:10 am

2 stops35h 34m

Reykjavik Keflavik Intl

Wed 1/27

5:00 pm-9:56 pm

2 stops33h 56m

$1,356

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Wed 1/20

1:36 pm-6:10 am

2 stops35h 34m

Reykjavik Keflavik Intl

Wed 1/27

5:00 pm-9:56 pm

2 stops33h 56m

$1,356

Quickest round-trip

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Sun 1/24

6:00 am-6:10 am

2 stops19h 10m

Reykjavik Keflavik Intl

Fri 1/29

5:15 pm-12:46 pm

1 stop24h 31m

$1,364

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Tue 4/6

9:45 am-8:55 am

2 stops19h 10m

Reykjavik Keflavik Intl

Sun 4/11

4:45 pm-9:57 pm

2 stops33h 12m

$1,399

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Sun 2/7

1:36 pm-6:10 am

2 stops35h 34m

Reykjavik Keflavik Intl

Tue 2/16

5:15 pm-8:35 am

1 stop20h 20m

$1,401

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/1

Showing 1-10 of 12 resultsSorted 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.

ISP-KEF

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

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

Hveragerdi

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$1,314+ Cheap flights from Islip, NY (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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Keflavik Intl with Cheapflights

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Cheap flight deals from Islip to Keflavik Intl

Best flights from Islip to Keflavik IntlDiscover carefully curated flight deals from Islip to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 5, 2026.

Discover carefully curated flight deals from Islip to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 5, 2026.

Find flight deals from Islip to Keflavik Intl

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Use the filters below to find and compare flights from Islip to Reykjavik Keflavik Intl Airport that are best for you.

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.

Related info for your journey

What airport do you fly from for flights from Islip to Reykjavik Keflavik Intl?

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

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

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

Traveling to a place near Reykjavik Keflavik Intl Airport?

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Alternative routes for Islip to Keflavik Intl

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Keflavik Intl by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Islip to Keflavik Intl by cabin class

Find flights from Islip to Keflavik Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Other flights to Keflavik Intl

Explore flights to Keflavik Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on November 5, 2026.

Islip and Keflavik Intl flights

Browse other Islip and Keflavik Intl flight options. Last updated on November 5, 2026.

Other flights from Islip

Browse through other flights departing from Islip. Flights are based on user searches made on Cheapflights and were last updated on November 5, 2026.

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Best flights from Islip to Keflavik Intl
Discover carefully curated flight deals from Islip to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 5, 2026.