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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 484

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 22/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
8 Jan — 15 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 9 December 2025.

Thu 25/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Mon 29/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 6/12C$ 2,175
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 7/12C$ 2,384
Fri 26/127:55 p.m.SEA - KEF
1 stop26h 10mIcelandair
Mon 29/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 6/12C$ 2,410
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 7/12C$ 3,055
Thu 25/122:35 p.m.SEA - KEF
Nonstop7h 40mMultiple Airlines
Wed 31/124:50 p.m.KEF - SEA
1 stop25h 30mMultiple Airlines
Deal found 6/12C$ 3,088
Mon 15/128:14 p.m.SEA - KEF
1 stop25h 51mIcelandair
Mon 5/15:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 7/12C$ 3,199

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 9 December 2025.

Round-trip from

C$ 689

One-way from

C$ 484

Popular in

February

Cheapest in

October

Average price

C$ 834

Good round-trip deal

C$ 561 or less
Icelandair
  • Icelandair
  • 19/4-23/4
  • Nonstop
  • 15h 20m total
  • Seattle to Reykjavik
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22/1
  • 22/1
  • 2 total stops
  • 24h 45m total
  • Seattle to Reykjavik
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 107 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.
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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 9 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$ 689

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 14/4

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

2 stops17h 00m

Reykjavik Keflavik Intl

Sun 26/4

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

1 stop17h 51m

C$ 943

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 26/4

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

1 stop14h 45m

Reykjavik Keflavik Intl

Tue 5/5

11:25 a.m.-9:20 a.m.

2 stops28h 55m

C$ 985

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 26/5

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Thu 4/6

10:40 a.m.-11:45 a.m.

Nonstop8h 05m

C$ 985

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 16/4

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

2 stops20h 30m

Reykjavik Keflavik Intl

Mon 27/4

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

1 stop17h 51m

C$ 1,012

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 17/4

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

1 stop14h 45m

Reykjavik Keflavik Intl

Sat 25/4

11:25 a.m.-9:20 a.m.

2 stops28h 55m

C$ 1,012

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 31/3

9:52 a.m.-9:30 a.m.

2 stops16h 38m

Reykjavik Keflavik Intl

Sun 12/4

11:25 a.m.-2:19 p.m.

1 stop33h 54m

C$ 1,051

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 6/4

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Sat 11/4

8:20 p.m.-10:28 a.m.

1 stop21h 08m

C$ 1,083

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 21/4

1:45 p.m.-9:30 a.m.

2 stops36h 45m

Reykjavik Keflavik Intl

Mon 4/5

11:25 a.m.-10:24 a.m.

1 stop29h 59m

C$ 1,088

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 24/4

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

1 stop14h 45m

Reykjavik Keflavik Intl

Sat 2/5

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

1 stop15h 08m

C$ 1,117

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

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 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$ 487). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of C$ 711). 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 9 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.

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 2 outbound flights to Reykjavik Keflavik Intl per day.

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

    Icelandair, Delta, and Virgin Atlantic can get you from Seattle to Reykjavik Keflavik Intl Airport in just under 7h 25m. Your travel time can differ by up to 13h 05m. 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$ 626 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 554 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 653.

  • 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$ 487). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of C$ 711). 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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