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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 656

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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
9 Mar — 16 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Keflavik Intl

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Keflavik Intl
Explore the most affordable flight options available from Seattle to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 February 2026.

Mon 13/412:00 p.m.
SEA
-
KEF
1 stop14h 30m
Delta
Tue 28/411:25 a.m.
KEF
-
SEA
1 stop15h 34m
Delta
Deal found 6/2C$ 670
Sat 18/44:00 p.m.
SEA
-
KEF
1 stop34h 30m
Delta
Tue 28/411:25 a.m.
KEF
-
SEA
1 stop15h 34m
Delta
Deal found 6/2C$ 678
Tue 14/47:00 p.m.
SEA
-
KEF
Nonstop7h 25m
Icelandair
Mon 27/44:50 p.m.
KEF
-
SEA
Nonstop8h 05m
Icelandair
Deal found 6/2C$ 684
Sun 26/410:40 p.m.
SEA
-
KEF
1 stop27h 50m
Multiple Airlines
Tue 12/58:50 a.m.
KEF
-
SEA
1 stop16h 59m
Multiple Airlines
Deal found 5/2C$ 688
Thu 16/412:00 p.m.
SEA
-
KEF
1 stop14h 30m
Delta
Thu 23/411:25 a.m.
KEF
-
SEA
1 stop15h 34m
Delta
Deal found 6/2C$ 693
Sun 26/412:00 p.m.
SEA
-
KEF
1 stop14h 30m
Virgin Atlantic
Tue 12/58:50 a.m.
KEF
-
SEA
2 stops18h 53m
Virgin Atlantic
Deal found 5/2C$ 697
Sat 18/410:40 p.m.
SEA
-
KEF
1 stop27h 50m
KLM
Mon 27/411:25 a.m.
KEF
-
SEA
1 stop18h 06m
KLM
Deal found 4/2C$ 701
Wed 15/44:00 p.m.
SEA
-
KEF
1 stop34h 30m
Delta
Wed 22/411:25 a.m.
KEF
-
SEA
1 stop18h 06m
Delta
Deal found 6/2C$ 706
Mon 20/47:20 a.m.
SEA
-
KEF
1 stop19h 10m
Delta
Sun 26/411:25 a.m.
KEF
-
SEA
1 stop30h 33m
Delta
Deal found 6/2C$ 708
Sun 26/41:19 p.m.
SEA
-
KEF
2 stops35h 31m
Finnair
Tue 12/58:35 a.m.
KEF
-
SEA
2 stops21h 03m
Finnair
Deal found 5/2C$ 711
Sat 18/44:00 p.m.
SEA
-
KEF
1 stop34h 30m
Delta
Sun 26/411:25 a.m.
KEF
-
SEA
1 stop34h 17m
Delta
Deal found 6/2C$ 714

Find flight deals from Seattle to Keflavik Intl

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) 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 7 February 2026.

Round-trip from

C$ 670

One-way from

C$ 656

Popular in

June

Cheapest in

October

Average price

C$ 872

Good round-trip deal

C$ 576 or less

Good one-way deal

C$ 279 or less
Delta
  • Delta
  • 13/4-23/4
  • 2 total stops
  • 32h 36m total
  • Seattle to Reykjavik
Search Deals
WestJet
  • WestJet
  • 12/7
  • 2 total stops
  • 12h 00m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 84 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Reykjavik Keflavik Intl.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Reykjavik Keflavik Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle 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 629,999 searches. Data last updated 7 February 2026.
Use the filters below to find and compare flights from Seattle to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

Seattle

Fly to

Keflavik Intl

Route

Depart

Return

Price

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 14/4

7:35 a.m.-9:30 a.m.

2 stops18h 55m

Reykjavik Keflavik Intl

Wed 22/4

11:25 a.m.-11:51 p.m.

2 stops19h 26m

C$ 677

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 13/4

12:00 p.m.-9:30 a.m.

1 stop14h 30m

Reykjavik Keflavik Intl

Tue 28/4

11:25 a.m.-10:05 p.m.

2 stops17h 40m

C$ 677

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 3/5

12:00 p.m.-9:30 a.m.

1 stop14h 30m

Reykjavik Keflavik Intl

Wed 13/5

11:25 a.m.-11:41 p.m.

2 stops19h 16m

C$ 697

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 19/4

7:20 a.m.-9:30 a.m.

1 stop19h 10m

Reykjavik Keflavik Intl

Sun 26/4

11:25 a.m.-2:42 p.m.

1 stop34h 17m

C$ 706

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 1/5

12:00 p.m.-9:30 a.m.

1 stop14h 30m

Reykjavik Keflavik Intl

Thu 7/5

11:25 a.m.-10:29 p.m.

1 stop18h 04m

C$ 759

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 10/5

9:00 a.m.-7:40 a.m.

1 stop15h 40m

Reykjavik Keflavik Intl

Mon 18/5

11:25 a.m.-8:07 p.m.

1 stop15h 42m

C$ 768

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 20/4

1:19 p.m.-7:50 a.m.

2 stops35h 31m

Reykjavik Keflavik Intl

Sun 26/4

8:35 a.m.-10:38 p.m.

2 stops21h 03m

C$ 775

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 2/5

10:40 p.m.-9:30 a.m.

1 stop27h 50m

Reykjavik Keflavik Intl

Sun 24/5

8:50 a.m.-10:28 p.m.

1 stop20h 38m

C$ 775

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 24/4

10:40 p.m.-9:30 a.m.

1 stop27h 50m

Reykjavik Keflavik Intl

Sun 3/5

11:25 a.m.-10:31 p.m.

1 stop18h 06m

C$ 800

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 30/5

7:00 p.m.-9:25 a.m.

Nonstop7h 25m

Reykjavik Keflavik Intl

Sun 21/6

10:40 a.m.-11:45 a.m.

Nonstop8h 05m

C$ 809

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 17 results
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Best time to book a flight from Seattle to Keflavik Intl

Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from Seattle 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 Seattle to Reykjavik Keflavik Intl Airport

How far ahead should I book a flight from Seattle to Reykjavik Keflavik Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Keflavik Intl. Price data was last updated on 30 January 2026.

The price you pay for your flight from Seattle to Reykjavik Keflavik Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 67 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, October is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 481). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of C$ 703). 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.

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

Find hourly flight availability from Seattle to Keflavik Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 7 February 2026.

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

How much does it cost to fly round-trip from Seattle to Reykjavik Keflavik Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from Seattle 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 Seattle to Reykjavik Keflavik Intl?

    Seattle/Tacoma Intl (SEA), located 18.4 km from the city centre, is the airport you fly out of when you book flights from Seattle to Reykjavik Keflavik Intl. 0 airlines have flights from Seattle/Tacoma Intl to Reykjavik Keflavik Intl on a regular basis. Booking flights from Seattle/Tacoma Intl to Reykjavik Keflavik Intl should not be difficult; the airport handles an average of 2 outbound flights to Reykjavik Keflavik Intl per day.

  • How long is the flight from Seattle to Reykjavik Keflavik Intl Airport?

    Delta, KLM, and Finnair can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 15h 40m. Your travel time can differ by up to 19h 51m. Seattle and Reykjavik Keflavik Intl Airport are separated by a distance of 5807 km. This flight may include one or multiple stops.

  • What are the most reliable airlines from Seattle to Reykjavik Keflavik Intl Airport?

    The top 3 most reliable airlines when flying from Seattle to Reykjavik Keflavik Intl Airport are Alaska Airlines (83%), Icelandair (83%) and airBaltic (82%).

  • What are the cheapest flights from Seattle to Reykjavik Keflavik Intl Airport?

    On average you can expect to pay C$ 597 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 563 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 645.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 481). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of C$ 703). 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

Travelling to a place near Reykjavik Keflavik Intl Airport?

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

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Can Cheapflights notify me if prices for flights from Seattle to Keflavik Intl become cheaper?

Not ready to book yet? You can track prices for flights from Seattle to Keflavik Intl on Cheapflights with our Price Alert feature and get notified when better prices are available.

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