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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 582

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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
16 Oct — 23 Oct1
1 adult
1 adult, Economy

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 16 September 2025.

Round-trip from

C$ 620

One-way from

C$ 582

Popular in

December

Cheapest in

October

Average price

C$ 966

Good round-trip deal

C$ 601 or less

Good one-way deal

C$ 1,270 or less
Icelandair
  • Icelandair
  • 5/10-15/10
  • Nonstop
  • 15h 25m total
  • Seattle to Reykjavik
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4/10
  • 4/10
  • 1 total stop
  • 12h 52m total
  • Seattle to Reykjavik
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Highest demand for flights based on searches. 10% potential increase in price (C$ 153 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 20 potential savings vs. average RT price).
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Average for round-trip flights in September 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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Find flight deals from Seattle to Keflavik Intl

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 16 September 2025.

Sun 5/103:45 p.m.SEA - KEF
Nonstop7h 30mIcelandair
Wed 15/107:45 p.m.KEF - SEA
Nonstop7h 55mIcelandair
Deal found 15/9C$ 620
Tue 16/97:15 a.m.SEA - KEF
1 stop17h 55mUnited Airlines
Tue 23/99:50 a.m.KEF - SEA
2 stops37h 01mUnited Airlines
Deal found 15/9C$ 642
Sun 5/1011:46 a.m.SEA - KEF
1 stop11h 34mDelta
Mon 13/1011:25 a.m.KEF - SEA
1 stop17h 57mDelta
Deal found 15/9C$ 653
Sat 4/1011:40 p.m.SEA - KEF
2 stops23h 40mDelta
Mon 13/1011:25 a.m.KEF - SEA
2 stops30h 08mDelta
Deal found 15/9C$ 660
Sat 4/1011:10 p.m.SEA - KEF
1 stop24h 10mDelta
Tue 14/108:45 a.m.KEF - SEA
1 stop12h 50mDelta
Deal found 15/9C$ 664
Thu 4/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Wed 10/125:00 p.m.KEF - SEA
Nonstop9h 00mIcelandair
Deal found 15/9C$ 669
Sun 28/911:11 p.m.SEA - KEF
1 stop24h 09mDelta
Tue 7/1011:25 a.m.KEF - SEA
2 stops29h 49mDelta
Deal found 15/9C$ 670
Tue 16/92:00 p.m.SEA - KEF
1 stop11h 30mUnited Airlines
Wed 24/911:00 a.m.KEF - SEA
1 stop14h 29mUnited Airlines
Deal found 15/9C$ 671
Thu 4/122:35 p.m.SEA - KEF
Nonstop7h 40mIcelandair
Mon 15/125:00 p.m.KEF - SEA
Nonstop8h 00mIcelandair
Deal found 15/9C$ 717

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 16 September 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

Fri 31/10

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Wed 19/11

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

Nonstop8h 00m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 7/10

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Thu 16/10

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

Nonstop7h 55m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 9/10

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Wed 15/10

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

Nonstop7h 55m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 6/10

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Thu 16/10

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

Nonstop7h 55m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 31/10

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Thu 20/11

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

Nonstop8h 00m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 2/12

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

Nonstop7h 40m

Reykjavik Keflavik Intl

Wed 10/12

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

Nonstop8h 00m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 9/10

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Fri 17/10

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

Nonstop7h 55m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 5/10

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Thu 16/10

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

Nonstop7h 55m

C$ 620

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 4/10

11:40 p.m.-6:20 a.m.

2 stops23h 40m

Reykjavik Keflavik Intl

Tue 14/10

11:25 a.m.-10:33 a.m.

2 stops30h 08m

C$ 660

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 5/10

11:40 p.m.-6:20 a.m.

2 stops23h 40m

Reykjavik Keflavik Intl

Mon 13/10

8:45 a.m.-10:03 p.m.

1 stop20h 18m

C$ 660

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/9

Showing 1-10 of 18 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 September 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, January is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 268). Flying from Seattle to Reykjavik Keflavik Intl Airport in December is currently the most expensive (average of C$ 593). 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 16 September 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 at noon, 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 3 outbound flights 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 cheapest flights from Seattle to Reykjavik Keflavik Intl Airport?

    On average you can expect to pay C$ 1,030 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 518 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 652.

  • 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, January is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 268). Flying from Seattle to Reykjavik Keflavik Intl Airport in December is currently the most expensive (average of C$ 593). 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
Hveragerdi
Grindavik
Kopavogur
Keflavik

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Can Cheapflights notify me if prices for flights from Seattle to Keflavik Intl become cheaper?

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