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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 591

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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
23 Aug — 30 Aug1
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 24 July 2026.

Mon 20/78:00 a.m.
SEA
-
KEF
1 stop17h 45m
United Airlines
Tue 28/710:00 a.m.
KEF
-
SEA
2 stops40h 06m
United Airlines
Deal found 19/7C$ 714
Tue 21/78:15 a.m.
SEA
-
KEF
1 stop17h 15m
United Airlines
Mon 27/712:00 p.m.
KEF
-
SEA
1 stop28h 40m
United Airlines
Deal found 20/7C$ 717
Thu 23/79:05 a.m.
SEA
-
KEF
1 stop14h 55m
Delta
Wed 29/79:30 a.m.
KEF
-
SEA
1 stop32h 29m
Delta
Deal found 22/7C$ 724
Wed 22/79:45 a.m.
SEA
-
KEF
1 stop14h 55m
Virgin Atlantic
Fri 31/79:30 a.m.
KEF
-
SEA
1 stop21h 28m
Virgin Atlantic
Deal found 20/7C$ 726
Tue 21/77:15 a.m.
SEA
-
KEF
1 stop19h 15m
Delta
Mon 27/79:30 a.m.
KEF
-
SEA
1 stop14h 30m
Delta
Deal found 20/7C$ 731
Tue 21/79:45 a.m.
SEA
-
KEF
2 stops16h 45m
Virgin Atlantic
Mon 27/79:30 a.m.
KEF
-
SEA
1 stop21h 28m
Virgin Atlantic
Deal found 19/7C$ 733
Wed 22/78:00 a.m.
SEA
-
KEF
1 stop17h 45m
United Airlines
Sun 26/711:00 a.m.
KEF
-
SEA
1 stop19h 44m
United Airlines
Deal found 21/7C$ 735
Wed 22/78:00 a.m.
SEA
-
KEF
1 stop17h 45m
United Airlines
Wed 29/79:50 a.m.
KEF
-
SEA
1 stop18h 17m
United Airlines
Deal found 21/7C$ 739

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 24 July 2026.

Round-trip from

C$ 801

One-way from

C$ 591

Popular in

August

Cheapest in

May

Average price

C$ 1,046

Good round-trip deal

C$ 674 or less

Good one-way deal

C$ 524 or less
Icelandair
  • Icelandair
  • 27/8-2/9
  • Nonstop
  • 15h 30m total
  • Seattle to Reykjavik
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Alaska Airlines
  • Alaska Airlines
  • 5/9
  • Nonstop
  • 7h 25m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 236 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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.
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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 24 July 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
Quickest round-trip

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 8/9

11:25 p.m.-2:00 p.m.

Nonstop7h 35m

Reykjavik Keflavik Intl

Tue 22/9

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

Nonstop7h 55m

C$ 849

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 8/9

11:25 p.m.-2:00 p.m.

Nonstop7h 35m

Reykjavik Keflavik Intl

Mon 21/9

4:50 p.m.-5:55 p.m.

Nonstop8h 05m

C$ 849

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 10/9

6:00 a.m.-7:00 a.m.

1 stop18h 00m

Reykjavik Keflavik Intl

Tue 22/9

9:30 a.m.-8:36 p.m.

1 stop18h 06m

C$ 884

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 27/8

6:05 a.m.-7:00 a.m.

1 stop17h 55m

Reykjavik Keflavik Intl

Wed 2/9

11:25 a.m.-8:20 p.m.

1 stop15h 55m

C$ 890

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 30/8

9:45 p.m.-9:30 a.m.

2 stops28h 45m

Reykjavik Keflavik Intl

Sat 5/9

11:25 a.m.-11:57 p.m.

2 stops19h 32m

C$ 890

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 9/9

5:45 a.m.-7:00 a.m.

2 stops18h 15m

Reykjavik Keflavik Intl

Sat 19/9

11:25 a.m.-11:20 p.m.

1 stop18h 55m

C$ 890

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 27/8

5:30 a.m.-9:30 a.m.

2 stops21h 00m

Reykjavik Keflavik Intl

Wed 2/9

9:30 a.m.-10:00 p.m.

1 stop19h 30m

C$ 895

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 28/8

6:05 p.m.-7:00 a.m.

1 stop29h 55m

Reykjavik Keflavik Intl

Sat 5/9

11:25 a.m.-11:20 p.m.

1 stop18h 55m

C$ 895

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 13/8

7:16 a.m.-7:40 a.m.

2 stops17h 24m

Reykjavik Keflavik Intl

Sun 23/8

9:30 a.m.-11:54 p.m.

1 stop21h 24m

C$ 897
Cheapest one-way
Quickest one-way

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 5/8

6:35 p.m.-9:00 a.m.

Nonstop7h 25m

C$ 738

Flights are sorted by cheapest round-trip flights first.

Deals found on 21/7

Showing 1-10 of 15 resultsSorted by cheapest first
1
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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 89 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, May is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 767). Flying from Seattle to Reykjavik Keflavik Intl Airport in August is currently the most expensive (average of C$ 1,354). 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 24 July 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?

Airfare is below average for this route at the moment.

Seattle to Reykjavik Keflavik Intl Airport flights typically cost between C$ 866 and C$ 1,484 in August.
The cheapest round-trip price found within the last 5 days was C$ 801 on Icelandair (27 Aug-2 Sep).

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 6 outbound flights to Reykjavik Keflavik Intl per day.

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

    Icelandair and Delta can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 7h 35m. Your travel time can differ by up to 10h 25m. 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 cheapest flights from Seattle to Reykjavik Keflavik Intl Airport?

    On average you can expect to pay C$ 763 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 335 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 718.

  • 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, May is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 767). Flying from Seattle to Reykjavik Keflavik Intl Airport in August is currently the most expensive (average of C$ 1,354). 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
Keflavik
Hveragerdi
Grindavik

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

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