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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 687

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 19/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
11 Jan — 18 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 12 December 2025.

Wed 10/1211:20 p.m.SEA - KEF
1 stop22h 55mAlaska Airlines
Mon 15/124:50 p.m.KEF - SEA
1 stop11h 59mAlaska Airlines
Deal found 9/12C$ 1,688
Wed 24/129:35 a.m.SEA - KEF
1 stop12h 30mMultiple Airlines
Wed 31/125:00 p.m.KEF - SEA
Nonstop8h 00mMultiple Airlines
Deal found 10/12C$ 2,143
Tue 23/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Mon 29/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 10/12C$ 2,247
Wed 31/1211:20 a.m.SEA - KEF
2 stops45h 55mBritish Airways
Wed 7/111:50 a.m.KEF - SEA
2 stops42h 30mBritish Airways
Deal found 10/12C$ 3,046
Fri 19/122:35 p.m.SEA - KEF
Nonstop7h 40mMultiple Airlines
Thu 1/15:30 p.m.KEF - SEA
1 stop25h 01mMultiple Airlines
Deal found 11/12C$ 3,514
Sun 21/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Fri 26/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 10/12C$ 4,596
Sun 14/129:39 p.m.SEA - KEF
2 stops24h 36mAlaska Airlines
Sun 21/124:50 p.m.KEF - SEA
1 stop12h 42mAlaska Airlines
Deal found 10/12C$ 4,843
Fri 12/1211:22 a.m.SEA - KEF
2 stops39h 18mBritish Airways
Thu 18/1211:45 a.m.KEF - SEA
2 stops43h 28mBritish Airways
Deal found 10/12C$ 5,115
Fri 19/127:25 a.m.SEA - KEF
2 stops25h 35mScandinavian Airlines
Fri 2/17:35 a.m.KEF - SEA
2 stops24h 23mScandinavian Airlines
Deal found 11/12C$ 5,864

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 December 2025.

Round-trip from

C$ 687

Popular in

February

Cheapest in

October

Average price

C$ 832

Good round-trip deal

C$ 560 or less
Icelandair
  • Icelandair
  • 19/4-23/4
  • Nonstop
  • 15h 30m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 106 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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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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 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 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$ 687

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 12/4

1:40 p.m.-9:30 a.m.

1 stop12h 50m

Reykjavik Keflavik Intl

Wed 29/4

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

1 stop15h 08m

C$ 866

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 15/1

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Tue 20/1

5:00 p.m.-10:34 a.m.

1 stop25h 34m

C$ 1,076

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 3/4

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

2 stops51h 00m

Reykjavik Keflavik Intl

Sun 12/4

11:25 a.m.-12:19 p.m.

2 stops31h 54m

C$ 1,077

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 17/3

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Thu 26/3

4:55 p.m.-9:07 a.m.

1 stop23h 12m

C$ 1,087

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 24/4

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

1 stop14h 45m

Reykjavik Keflavik Intl

Sun 3/5

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

1 stop17h 51m

C$ 1,114

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 19/5

2:14 p.m.-8:30 a.m.

1 stop11h 16m

Reykjavik Keflavik Intl

Tue 26/5

11:30 a.m.-10:18 p.m.

2 stops17h 48m

C$ 1,152

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 19/5

2:14 p.m.-8:30 a.m.

1 stop11h 16m

Reykjavik Keflavik Intl

Wed 27/5

11:30 a.m.-10:18 p.m.

2 stops17h 48m

C$ 1,152

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 8/5

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

1 stop12h 00m

Reykjavik Keflavik Intl

Fri 22/5

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

1 stop17h 51m

C$ 1,152

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 15/5

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

1 stop12h 00m

Reykjavik Keflavik Intl

Wed 27/5

9:30 a.m.-4:13 p.m.

1 stop13h 43m

C$ 1,152

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 22 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 5 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$ 709). 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 December 2025.

It’s typically best to fly out from Seattle to Reykjavik Keflavik Intl Airport in the morning. Doing so could potentially save you 13% on the flight price compared to flying in the evening, 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 25m. Your travel time can differ by up to 5h 25m. 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 (80%), Alaska Airlines (65%) and Icelandair (65%).

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

    On average you can expect to pay C$ 624 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 552 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 651.

  • 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$ 709). 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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