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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 586

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
17 Jan — 24 Jan1
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 18 December 2025.

Mon 22/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Fri 26/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/12C$ 2,029
Mon 22/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Thu 25/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/12C$ 2,147
Wed 17/128:34 a.m.SEA - KEF
1 stop13h 41mMultiple Airlines
Wed 24/124:50 p.m.KEF - SEA
1 stop25h 30mMultiple Airlines
Deal found 16/12C$ 2,280
Tue 16/1211:36 a.m.SEA - KEF
1 stop10h 39mIcelandair
Sat 20/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/12C$ 2,345
Mon 22/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Wed 24/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/12C$ 2,350
Thu 18/1211:16 a.m.SEA - KEF
1 stop10h 59mIcelandair
Thu 25/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 16/12C$ 2,374
Thu 25/128:30 a.m.SEA - KEF
1 stop14h 00mMultiple Airlines
Wed 31/125:00 p.m.KEF - SEA
Nonstop8h 00mMultiple Airlines
Deal found 17/12C$ 2,764
Fri 26/126:50 p.m.SEA - KEF
2 stops54h 10mFinnair
Wed 7/110:00 a.m.KEF - SEA
2 stops38h 55mFinnair
Deal found 18/12C$ 2,893
Tue 30/126:50 p.m.SEA - KEF
1 stop31h 55mBritish Airways
Tue 6/111:50 a.m.KEF - SEA
2 stops57h 24mBritish Airways
Deal found 18/12C$ 2,930
Mon 29/123:37 p.m.SEA - KEF
2 stops35h 13mBritish Airways
Tue 6/111:50 a.m.KEF - SEA
2 stops57h 24mBritish Airways
Deal found 18/12C$ 2,966
Sun 28/129:58 p.m.SEA - KEF
2 stops52h 52mBritish Airways
Tue 6/111:50 a.m.KEF - SEA
2 stops57h 24mBritish Airways
Deal found 18/12C$ 2,975
Mon 29/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Mon 5/15:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 18/12C$ 3,019

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 18 December 2025.

Round-trip from

C$ 681

One-way from

C$ 586

Popular in

February

Cheapest in

October

Average price

C$ 839

Good round-trip deal

C$ 594 or less
Delta
  • Delta
  • 15/4-21/4
  • 2 total stops
  • 44h 44m total
  • Seattle to Reykjavik
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26/4
  • 26/4
  • 2 total stops
  • 30h 30m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 102 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 18 December 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 22/2

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Mon 2/3

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

Nonstop8h 00m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 22/2

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Thu 26/2

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

Nonstop8h 00m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 17/3

3:35 p.m.-6:15 a.m.

Nonstop7h 40m

Reykjavik Keflavik Intl

Thu 2/4

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

Nonstop7h 55m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 18/2

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Tue 24/2

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

Nonstop8h 00m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 9/3

3:35 p.m.-6:15 a.m.

Nonstop7h 40m

Reykjavik Keflavik Intl

Wed 18/3

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

Nonstop8h 00m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 25/2

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Mon 2/3

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

Nonstop8h 00m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 19/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Thu 23/4

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

Nonstop7h 55m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 19/2

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Wed 25/2

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

Nonstop8h 00m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 1/2

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Thu 5/2

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

Nonstop8h 00m

C$ 686

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 10/3

3:35 p.m.-6:15 a.m.

Nonstop7h 40m

Reykjavik Keflavik Intl

Wed 18/3

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

Nonstop8h 00m

C$ 686

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/12

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 12 December 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 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$ 485). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of C$ 708). 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 December 2025.

It’s typically best to fly out from Seattle to Reykjavik Keflavik Intl Airport at noon. Doing so could potentially save you 14% on the flight price compared to flying in the evening, 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 40m. 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 (86%), Alaska Airlines (60%) and Icelandair (60%).

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

    On average you can expect to pay C$ 651 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 556 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 650.

  • 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$ 485). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of C$ 708). 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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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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