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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 602

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
18 Dec — 25 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 18 November 2025.

Thu 4/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Tue 9/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 17/11C$ 699
Wed 3/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Wed 10/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 17/11C$ 980
Sun 7/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Thu 11/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 17/11C$ 1,134
Sat 6/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Wed 10/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 17/11C$ 1,141
Fri 5/127:55 a.m.SEA - KEF
1 stop14h 10mIcelandair
Tue 9/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 17/11C$ 1,204
Thu 4/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Sat 13/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 17/11C$ 1,215
Sat 6/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Tue 9/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 17/11C$ 1,260
Tue 16/127:55 a.m.SEA - KEF
1 stop14h 10mIcelandair
Wed 24/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/11C$ 1,280
Wed 10/125:00 p.m.SEA - KEF
1 stop29h 15mAlaska Airlines
Wed 17/124:50 p.m.KEF - SEA
1 stop11h 36mAlaska Airlines
Deal found 17/11C$ 1,304
Tue 16/127:55 a.m.SEA - KEF
1 stop14h 10mIcelandair
Fri 26/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/11C$ 1,308
Wed 17/127:55 a.m.SEA - KEF
1 stop14h 10mIcelandair
Wed 24/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/11C$ 1,321

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 18 November 2025.

Round-trip from

C$ 602

Popular in

March

Cheapest in

October

Average price

C$ 1,103

Good round-trip deal

C$ 643 or less

Good one-way deal

C$ 1,290 or less
Icelandair
  • Icelandair
  • 9/3-17/3
  • Nonstop
  • 15h 40m total
  • Seattle to Reykjavik
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Highest demand for flights based on searches. 5% potential increase in price (C$ 82 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 23 potential savings vs. average RT price).
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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.
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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 18 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

Sun 5/4

3:45 p.m.-6:15 a.m.

Nonstop7h 30m

Reykjavik Keflavik Intl

Tue 14/4

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

Nonstop7h 55m

C$ 699

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 8/3

3:00 p.m.-5:45 a.m.

Nonstop7h 45m

Reykjavik Keflavik Intl

Sun 15/3

5:00 p.m.-6:00 p.m.

Nonstop8h 00m

C$ 699

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 7/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Tue 14/4

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

Nonstop8h 00m

C$ 699

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 4/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Fri 10/4

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

Nonstop7h 55m

C$ 860

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 7/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Sun 12/4

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

Nonstop7h 55m

C$ 874

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 17/1

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Wed 21/1

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

Nonstop8h 00m

C$ 888

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 18/1

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Sun 25/1

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

Nonstop8h 00m

C$ 888

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 8/5

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

1 stop17h 55m

Reykjavik Keflavik Intl

Tue 12/5

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

1 stop16h 46m

C$ 980

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 7/4

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

2 stops17h 00m

Reykjavik Keflavik Intl

Wed 15/4

11:25 a.m.-12:01 a.m.

2 stops19h 36m

C$ 1,027

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 17/1

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$ 1,064

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/11

Showing 1-10 of 20 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 14 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$ 494). Flying from Seattle to Reykjavik Keflavik Intl Airport in January is currently the most expensive (average of C$ 769). 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 18 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.

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 1 outbound flight to Reykjavik Keflavik Intl per day.

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

    Icelandair can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 7h 30m. Your travel time will be generally consistent. Seattle and Reykjavik Keflavik Intl Airport are separated by a distance of 5807 km. All flights are typically direct.

  • 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 (83%), Alaska Airlines (67%) and Icelandair (67%).

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

    On average you can expect to pay C$ 1,013 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 527 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 662.

  • 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$ 494). Flying from Seattle to Reykjavik Keflavik Intl Airport in January is currently the most expensive (average of C$ 769). 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 find flights from Seattle to Keflavik Intl with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Keflavik Intl with no change fees.

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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