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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 630

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 22/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
11 Apr — 18 Apr1
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 12 March 2026.

Mon 20/43:40 p.m.
SEA
-
KEF
Nonstop7h 35m
Icelandair
Fri 24/47:45 p.m.
KEF
-
SEA
Nonstop7h 55m
Icelandair
Deal found 10/3C$ 678
Wed 17/66:00 a.m.
SEA
-
KEF
1 stop17h 20m
Delta
Sat 27/68:45 a.m.
KEF
-
SEA
1 stop16h 51m
Delta
Deal found 11/3C$ 695
Tue 14/412:00 p.m.
SEA
-
KEF
1 stop14h 30m
KLM
Wed 22/411:25 a.m.
KEF
-
SEA
1 stop15h 34m
KLM
Deal found 8/3C$ 705
Tue 14/412:00 p.m.
SEA
-
KEF
1 stop14h 30m
Delta
Mon 27/411:25 a.m.
KEF
-
SEA
1 stop18h 06m
Delta
Deal found 10/3C$ 711
Tue 14/46:00 a.m.
SEA
-
KEF
2 stops20h 30m
Virgin Atlantic
Mon 27/411:25 a.m.
KEF
-
SEA
2 stops17h 25m
Virgin Atlantic
Deal found 10/3C$ 717
Mon 1/66:30 p.m.
SEA
-
KEF
Nonstop7h 30m
Alaska Airlines
Mon 8/612:45 p.m.
KEF
-
SEA
Nonstop7h 55m
Alaska Airlines
Deal found 10/3C$ 744
Sun 12/410:58 p.m.
SEA
-
KEF
1 stop27h 32m
KLM
Mon 20/411:25 a.m.
KEF
-
SEA
2 stops32h 00m
KLM
Deal found 7/3C$ 745
Sun 26/47:20 a.m.
SEA
-
KEF
1 stop19h 10m
Delta
Sat 2/511:25 a.m.
KEF
-
SEA
1 stop18h 06m
Delta
Deal found 11/3C$ 754
Fri 24/410:40 p.m.
SEA
-
KEF
1 stop27h 50m
Delta
Sun 3/511:25 a.m.
KEF
-
SEA
1 stop15h 34m
Delta
Deal found 10/3C$ 768
Thu 18/66:00 a.m.
SEA
-
KEF
1 stop17h 20m
Delta
Sun 28/611:25 a.m.
KEF
-
SEA
1 stop17h 51m
Delta
Deal found 11/3C$ 775
Fri 22/55:30 a.m.
SEA
-
KEF
1 stop17h 50m
Delta
Sun 31/58:50 a.m.
KEF
-
SEA
1 stop20h 58m
Delta
Deal found 11/3C$ 777

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 12 March 2026.

Round-trip from

C$ 678

One-way from

C$ 630

Popular in

December

Cheapest in

October

Average price

C$ 800

Good round-trip deal

C$ 744 or less

Good one-way deal

C$ 275 or less
Icelandair
  • Icelandair
  • 20/4-24/4
  • Nonstop
  • 15h 30m total
  • Seattle to Reykjavik
Search Deals
22/4
  • 22/4
  • 2 total stops
  • 33h 15m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 12 March 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

Wed 22/4

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

1 stop19h 10m

Reykjavik Keflavik Intl

Wed 29/4

11:25 a.m.-11:59 p.m.

2 stops19h 34m

C$ 717

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 24/4

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

1 stop27h 50m

Reykjavik Keflavik Intl

Sat 2/5

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

1 stop18h 06m

C$ 768

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 23/5

9:35 a.m.-6:20 a.m.

1 stop13h 45m

Reykjavik Keflavik Intl

Sun 31/5

8:50 a.m.-6:49 p.m.

1 stop16h 59m

C$ 778

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 23/5

9:35 a.m.-6:20 a.m.

1 stop13h 45m

Reykjavik Keflavik Intl

Sat 30/5

8:50 a.m.-10:48 p.m.

1 stop20h 58m

C$ 778

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 22/5

5:30 a.m.-6:20 a.m.

1 stop17h 50m

Reykjavik Keflavik Intl

Sun 31/5

8:50 a.m.-6:49 p.m.

1 stop16h 59m

C$ 778

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 14/6

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

1 stop19h 10m

Reykjavik Keflavik Intl

Wed 24/6

11:25 a.m.-10:16 p.m.

1 stop17h 51m

C$ 778

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 19/5

9:35 a.m.-6:20 a.m.

1 stop13h 45m

Reykjavik Keflavik Intl

Sat 30/5

8:50 a.m.-10:48 p.m.

1 stop20h 58m

C$ 778

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 22/5

5:30 a.m.-6:20 a.m.

1 stop17h 50m

Reykjavik Keflavik Intl

Sun 31/5

8:50 a.m.-11:44 p.m.

2 stops21h 54m

C$ 783

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 13/6

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

1 stop19h 10m

Reykjavik Keflavik Intl

Tue 23/6

8:45 a.m.-11:26 p.m.

2 stops21h 41m

C$ 783
Quickest round-trip

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 8/6

9:40 a.m.-6:20 a.m.

1 stop13h 40m

Reykjavik Keflavik Intl

Mon 15/6

8:50 a.m.-4:52 p.m.

2 stops15h 02m

C$ 783

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/3

Showing 1-10 of 21 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?

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 6 March 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$ 478). Flying from Seattle to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of C$ 678). 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 12 March 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.

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 and Virgin Atlantic can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 17h 50m. Your travel time can differ by up to 10h. 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 airBaltic (88%), Alaska Airlines (87%) and Icelandair (87%).

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

    On average you can expect to pay C$ 585 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 259 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 641.

  • 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$ 478). Flying from Seattle to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of C$ 678). 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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