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.

$1,055+ Cheap Flights from Islip, NY to Reykjavik Keflavik Intl Airport

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Islip to Keflavik Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Islip to Keflavik Intl

Cheapest

Best

Last-minute

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 September 18, 2026.

Sun 11/110:57 am -

1 stop14h 43m

Sun 11/84:45 pm -

1 stop26h 37m

Deal found 9/17

$1,055

Thu 10/296:33 pm -

2 stops31h 57m

Thu 11/55:15 pm -

1 stop29h 41m

Deal found 9/14

$1,273

Find flight deals from Islip to Keflavik Intl

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$1,055 (Kiwi.com)
Popular in	December
Cheapest in	October
Average price	$479

Provider with most accurate pricing for Islip Long Island-Reykjavik Keflavik Intl flight deals.

Search Deals

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. 5% potential increase in price ($27 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 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

Quickest round-trip

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Sun 11/1

10:57 am-6:40 am

1 stop14h 43m

Reykjavik Keflavik Intl

Sun 11/8

4:45 pm-2:22 pm

1 stop26h 37m

$1,055

IslipReykjavik

ISP Islip Long Island - KEF Reykjavik Keflavik Intl

ISPKEF

Islip Long Island

Thu 10/29

6:33 pm-6:30 am

2 stops31h 57m

Reykjavik Keflavik Intl

Thu 11/5

5:15 pm-5:56 pm

1 stop29h 41m

$1,273

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

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.

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

Keflavik

Hveragerdi

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Flights by cabin class

Keflavik Intl flight routes

Other flight options

Other flights from Islip

Popular flights

Alternative routes for Islip to Keflavik Intl

John F Kennedy Intl to Keflavik Intl flights

Newark to Keflavik Intl flights

Albany to Keflavik Intl flights

Stewart to Keflavik Intl flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$1,055+ 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 11/1. 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

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to Keflavik Intl

Cheapest flights from Islip to Keflavik IntlExplore 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 September 18, 2026.

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 September 18, 2026.

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 September 18, 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 September 18, 2026.

Last-minute flights from Islip to Keflavik IntlDiscover last-minute flight deals from Islip to Keflavik Intl. Data last updated September 18, 2026 and is based on user searches.

Discover last-minute flight deals from Islip to Keflavik Intl. Data last updated September 18, 2026 and is based on user searches.

Find flight deals from Islip to Keflavik Intl

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 September 18, 2026.

Islip and Keflavik Intl flights

Browse other Islip and Keflavik Intl flight options. Last updated on September 18, 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 September 18, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

100% Free

Book with Flexibility

Travel Smart

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 September 18, 2026.

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 September 18, 2026.

Last-minute flights from Islip to Keflavik Intl
Discover last-minute flight deals from Islip to Keflavik Intl. Data last updated September 18, 2026 and is based on user searches.