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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 575

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 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
27 Feb — 6 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 28 January 2026.

Mon 23/22:35 p.m.
SEA
-
KEF
Nonstop7h 40m
Icelandair
Mon 2/35:00 p.m.
KEF
-
SEA
Nonstop8h 00m
Icelandair
Deal found 25/1C$ 663
Wed 8/41:45 p.m.
SEA
-
KEF
1 stop12h 45m
Delta
Wed 22/411:25 a.m.
KEF
-
SEA
1 stop15h 34m
Delta
Deal found 27/1C$ 670
Tue 21/47:23 a.m.
SEA
-
KEF
1 stop19h 07m
KLM
Wed 29/411:25 a.m.
KEF
-
SEA
2 stops19h 34m
KLM
Deal found 26/1C$ 677
Mon 20/410:40 p.m.
SEA
-
KEF
1 stop27h 50m
KLM
Wed 29/411:25 a.m.
KEF
-
SEA
2 stops19h 34m
KLM
Deal found 27/1C$ 683
Wed 6/512:00 p.m.
SEA
-
KEF
1 stop14h 30m
Delta
Wed 13/59:30 a.m.
KEF
-
SEA
1 stop13h 43m
Delta
Deal found 26/1C$ 690
Wed 1/41:37 p.m.
SEA
-
KEF
2 stops35h 13m
Finnair
Wed 8/45:15 p.m.
KEF
-
SEA
2 stops36h 11m
Finnair
Deal found 25/1C$ 693
Tue 5/510:40 p.m.
SEA
-
KEF
1 stop27h 50m
Delta
Wed 13/58:50 a.m.
KEF
-
SEA
1 stop18h 39m
Delta
Deal found 25/1C$ 697
Wed 8/41:29 p.m.
SEA
-
KEF
2 stops35h 21m
Finnair
Wed 6/58:35 a.m.
KEF
-
SEA
2 stops20h 51m
Finnair
Deal found 26/1C$ 712
Wed 8/410:58 p.m.
SEA
-
KEF
1 stop27h 32m
Delta
Wed 6/511:25 a.m.
KEF
-
SEA
1 stop18h 06m
Delta
Deal found 26/1C$ 726
Tue 7/47:35 p.m.
SEA
-
KEF
2 stops54h 55m
Delta
Fri 8/58:50 a.m.
KEF
-
SEA
1 stop18h 39m
Delta
Deal found 26/1C$ 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 28 January 2026.

Round-trip from

C$ 663

One-way from

C$ 575

Popular in

June

Cheapest in

October

Average price

C$ 765

Good round-trip deal

C$ 588 or less
Icelandair
  • Icelandair
  • 23/2-2/3
  • Nonstop
  • 15h 40m total
  • Seattle to Reykjavik
Search Deals
Delta
  • Delta
  • 11/5
  • 1 total stop
  • 15h 15m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 78 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip 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 28 January 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

Wed 6/5

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

1 stop14h 30m

Reykjavik Keflavik Intl

Tue 12/5

8:50 a.m.-6:36 p.m.

1 stop16h 46m

C$ 690

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 20/4

1:29 p.m.-7:50 a.m.

2 stops35h 21m

Reykjavik Keflavik Intl

Wed 29/4

8:35 a.m.-10:26 p.m.

2 stops20h 51m

C$ 693

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 5/5

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

1 stop27h 50m

Reykjavik Keflavik Intl

Wed 13/5

8:50 a.m.-8:29 p.m.

1 stop18h 39m

C$ 697

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 6/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Wed 6/5

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

Nonstop7h 55m

C$ 756

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 6/5

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

1 stop14h 30m

Reykjavik Keflavik Intl

Fri 15/5

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

2 stops18h 38m

C$ 772

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

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

1 stop17h 54m

C$ 775

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 10/4

11:45 a.m.-9:30 a.m.

2 stops38h 45m

Reykjavik Keflavik Intl

Fri 8/5

8:50 a.m.-8:29 p.m.

1 stop18h 39m

C$ 782

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$ 796

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 10/5

3:40 p.m.-6:15 a.m.

Nonstop7h 35m

Reykjavik Keflavik Intl

Fri 15/5

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

Nonstop7h 55m

C$ 808

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 7/4

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

2 stops54h 55m

Reykjavik Keflavik Intl

Mon 4/5

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

1 stop18h 06m

C$ 808

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/1

Showing 1-10 of 21 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 23 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 28 January 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 1 outbound flight to Reykjavik Keflavik Intl per day.

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

    Delta, Finnair, and Icelandair can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 7h 25m. Your travel time can differ by up to 27h 56m. 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 (90%), Icelandair (90%) and airBaltic (88%).

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

    On average you can expect to pay C$ 595 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 562 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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