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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 619

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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
13 Dec — 20 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Seattle to Keflavik Intl

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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 November 2025.

Wed 26/1111:20 p.m.SEA - KEF
1 stop22h 55mAlaska Airlines
Wed 3/124:50 p.m.KEF - SEA
1 stop13h 55mAlaska Airlines
Deal found 12/11C$ 1,336
Fri 12/1211:15 p.m.SEA - KEF
2 stops23h 00mAlaska Airlines
Mon 15/124:50 p.m.KEF - SEA
1 stop12h 59mAlaska Airlines
Deal found 12/11C$ 1,530
Mon 17/1111:35 a.m.SEA - KEF
1 stop10h 40mAlaska Airlines
Fri 5/124:50 p.m.KEF - SEA
2 stops13h 19mAlaska Airlines
Deal found 13/11C$ 1,621
Thu 20/112:35 p.m.SEA - KEF
Nonstop7h 40mMultiple Airlines
Tue 25/114:55 p.m.KEF - SEA
1 stop15h 40mMultiple Airlines
Deal found 12/11C$ 1,667
Mon 8/127:05 a.m.SEA - KEF
2 stops15h 10mAlaska Airlines
Mon 15/124:50 p.m.KEF - SEA
2 stops13h 19mAlaska Airlines
Deal found 13/11C$ 1,711
Mon 17/116:50 p.m.SEA - KEF
2 stops30h 25mFinnair
Fri 5/1210:00 a.m.KEF - SEA
2 stops33h 30mFinnair
Deal found 13/11C$ 1,753
Fri 14/118:15 p.m.SEA - KEF
2 stops26h 00mAlaska Airlines
Sun 16/114:50 p.m.KEF - SEA
1 stop12h 57mAlaska Airlines
Deal found 13/11C$ 2,065
Thu 11/1211:15 a.m.SEA - KEF
2 stops20h 10mScandinavian Airlines
Thu 18/128:20 a.m.KEF - SEA
2 stops22h 34mScandinavian Airlines
Deal found 11/11C$ 2,421
Thu 11/125:00 a.m.SEA - KEF
3 stops25h 20mMultiple Airlines
Thu 18/123:10 p.m.KEF - SEA
2 stops41h 49mMultiple Airlines
Deal found 11/11C$ 2,616
Sat 13/126:50 p.m.SEA - KEF
1 stop32h 05mBritish Airways
Tue 16/1211:50 a.m.KEF - SEA
2 stops38h 30mBritish Airways
Deal found 12/11C$ 2,886

Cheap 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 November 2025.

Round-trip from

C$ 698

One-way from

C$ 619

Popular in

March

Cheapest in

October

Average price

C$ 1,101

Good round-trip deal

C$ 642 or less

Good one-way deal

C$ 1,288 or less
Icelandair
  • Icelandair
  • 13/1-21/1
  • Nonstop
  • 15h 40m total
  • Seattle to Reykjavik
Search Deals
10/12
  • 10/12
  • 2 total stops
  • 23h 15m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 83 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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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 13 November 2025.
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

Mon 20/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Fri 24/4

7:50 p.m.-8:45 p.m.

Nonstop7h 55m

C$ 698

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 13/1

2:35 p.m.-6:15 a.m.

Nonstop7h 40m

Reykjavik Keflavik Intl

Tue 20/1

5:00 p.m.-5:00 p.m.

Nonstop8h 00m

C$ 698

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 20/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Tue 28/4

7:50 p.m.-8:45 p.m.

Nonstop7h 55m

C$ 698

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 19/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Fri 24/4

7:50 p.m.-8:45 p.m.

Nonstop7h 55m

C$ 698

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 13/1

2:35 p.m.-6:15 a.m.

Nonstop7h 40m

Reykjavik Keflavik Intl

Fri 23/1

5:00 p.m.-5:00 p.m.

Nonstop8h 00m

C$ 873

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 21/4

11:40 p.m.-9:30 a.m.

2 stops50h 50m

Reykjavik Keflavik Intl

Wed 29/4

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

1 stop17h 51m

C$ 934

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 20/4

8:55 a.m.-12:55 p.m.

3 stops21h 00m

Reykjavik Keflavik Intl

Sat 25/4

12:25 a.m.-7:00 p.m.

2 stops25h 35m

C$ 943

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 4/5

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

1 stop14h 45m

Reykjavik Keflavik Intl

Tue 12/5

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

1 stop17h 51m

C$ 964

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 4/5

6:00 a.m.-9:30 a.m.

2 stops20h 30m

Reykjavik Keflavik Intl

Tue 12/5

11:25 a.m.-7:33 p.m.

1 stop15h 08m

C$ 971

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 4/5

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

1 stop14h 45m

Reykjavik Keflavik Intl

Mon 11/5

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

1 stop18h 39m

C$ 1,034

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 24 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 7 November 2025.

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 47 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$ 493). Flying from Seattle to Reykjavik Keflavik Intl Airport in January is currently the most expensive (average of C$ 768). 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 November 2025.

It’s typically best to fly out from Seattle to Reykjavik Keflavik Intl Airport in the morning. Doing so could potentially save you 14% on the flight price compared to flying in the afternoon, which is usually more expensive.

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?

    Icelandair and Delta can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 7h 40m. Your travel time can differ by up to 45h 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 airBaltic (100%), Alaska Airlines (80%) and Icelandair (80%).

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

    On average you can expect to pay C$ 1,011 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 526 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 661.

  • 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$ 493). Flying from Seattle to Reykjavik Keflavik Intl Airport in January is currently the most expensive (average of C$ 768). 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
Grindavik
Kopavogur
Keflavik
Hveragerdi

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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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