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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 603

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 22/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
12 Jun — 19 Jun1
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 13 May 2026.

Sat 3/107:00 p.m.
SEA
-
KEF
Nonstop7h 25m
Icelandair
Sun 18/107:45 p.m.
KEF
-
SEA
Nonstop7h 55m
Icelandair
Deal found 8/5C$ 652
Wed 23/97:00 a.m.
SEA
-
KEF
1 stop18h 50m
United Airlines
Fri 2/109:15 a.m.
KEF
-
SEA
2 stops40h 06m
United Airlines
Deal found 8/5C$ 659
Tue 6/105:00 a.m.
SEA
-
KEF
2 stops19h 55m
United Airlines
Sun 18/109:15 a.m.
KEF
-
SEA
2 stops44h 41m
United Airlines
Deal found 8/5C$ 663
Mon 21/97:00 a.m.
SEA
-
KEF
1 stop18h 50m
United Airlines
Mon 5/1010:00 a.m.
KEF
-
SEA
2 stops36h 49m
United Airlines
Deal found 11/5C$ 666
Mon 19/107:00 a.m.
SEA
-
KEF
2 stops18h 45m
United Airlines
Fri 23/109:15 a.m.
KEF
-
SEA
2 stops40h 44m
United Airlines
Deal found 10/5C$ 670
Tue 1/911:25 p.m.
SEA
-
KEF
Nonstop7h 35m
Icelandair
Wed 9/97:45 p.m.
KEF
-
SEA
Nonstop7h 55m
Icelandair
Deal found 11/5C$ 671
Thu 15/105:15 p.m.
SEA
-
KEF
1 stop32h 35m
United Airlines
Mon 19/1010:00 a.m.
KEF
-
SEA
2 stops39h 59m
United Airlines
Deal found 13/5C$ 674
Sat 3/105:15 p.m.
SEA
-
KEF
1 stop32h 35m
United Airlines
Sun 11/109:15 a.m.
KEF
-
SEA
2 stops57h 18m
United Airlines
Deal found 12/5C$ 675
Thu 24/911:50 p.m.
SEA
-
KEF
2 stops25h 55m
United Airlines
Mon 5/1010:00 a.m.
KEF
-
SEA
2 stops36h 49m
United Airlines
Deal found 12/5C$ 677
Sun 31/56:30 p.m.
SEA
-
KEF
Nonstop7h 30m
Alaska Airlines
Sat 6/612:45 p.m.
KEF
-
SEA
Nonstop7h 55m
Alaska Airlines
Deal found 8/5C$ 678
Fri 29/53:40 p.m.
SEA
-
KEF
Nonstop7h 35m
Icelandair
Sun 7/610:40 a.m.
KEF
-
SEA
Nonstop8h 05m
Icelandair
Deal found 12/5C$ 680

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 13 May 2026.

Round-trip from

C$ 652

One-way from

C$ 603

Popular in

December

Cheapest in

October

Average price

C$ 747

Good round-trip deal

C$ 804 or less

Good one-way deal

C$ 338 or less
Icelandair
  • Icelandair
  • 3/10-20/10
  • Nonstop
  • 15h 30m total
  • Seattle to Reykjavik
Search Deals
United Airlines
  • United Airlines
  • 4/11
  • 1 total stop
  • 11h 45m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 68 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 13 May 2026.
Use the filters below to find and compare flights from Seattle to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 21/9

10:47 a.m.-8:50 a.m.

1 stop15h 03m

Reykjavik Keflavik Intl

Mon 5/10

10:00 a.m.-9:04 p.m.

1 stop18h 04m

C$ 684
Quickest round-trip

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 8/6

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Fri 12/6

7:45 p.m.-8:40 p.m.

Nonstop7h 55m

C$ 684

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 24/9

9:05 a.m.-7:00 a.m.

1 stop14h 55m

Reykjavik Keflavik Intl

Mon 5/10

9:30 a.m.-8:24 p.m.

1 stop17h 54m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 10/9

7:00 a.m.-8:50 a.m.

1 stop18h 50m

Reykjavik Keflavik Intl

Mon 21/9

10:00 a.m.-9:04 p.m.

1 stop18h 04m

C$ 703

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 1/9

8:10 a.m.-8:30 a.m.

1 stop17h 20m

Reykjavik Keflavik Intl

Tue 8/9

11:30 a.m.-8:03 p.m.

1 stop15h 33m

C$ 706

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 2/9

8:00 a.m.-8:45 a.m.

1 stop17h 45m

Reykjavik Keflavik Intl

Mon 21/9

10:00 a.m.-9:04 p.m.

1 stop18h 04m

C$ 708

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 6/9

8:00 a.m.-8:45 a.m.

1 stop17h 45m

Reykjavik Keflavik Intl

Wed 16/9

12:00 p.m.-10:42 p.m.

1 stop17h 42m

C$ 710

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 2/9

7:00 a.m.-7:55 a.m.

2 stops17h 55m

Reykjavik Keflavik Intl

Sun 13/9

12:00 p.m.-10:42 p.m.

1 stop17h 42m

C$ 710

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 8/6

1:51 p.m.-8:50 a.m.

1 stop11h 59m

Reykjavik Keflavik Intl

Fri 12/6

11:30 a.m.-8:00 a.m.

2 stops27h 30m

C$ 723

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 1/9

8:40 a.m.-8:30 a.m.

2 stops16h 50m

Reykjavik Keflavik Intl

Sun 13/9

12:00 p.m.-10:03 a.m.

2 stops29h 03m

C$ 727

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/5

Showing 1-10 of 18 resultsSorted by cheapest first
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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?

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 82 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$ 582). Flying from Seattle to Reykjavik Keflavik Intl Airport in December is currently the most expensive (average of C$ 1,014). 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 13 May 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 4 outbound flights to Reykjavik Keflavik Intl per day.

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

    KLM and United Airlines can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 10h 15m. Your travel time can differ by up to 7h 30m. 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 (75%), Icelandair (74%) and airBaltic (71%).

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

    On average you can expect to pay C$ 720 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 338 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 878.

  • 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$ 582). Flying from Seattle to Reykjavik Keflavik Intl Airport in December is currently the most expensive (average of C$ 1,014). 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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