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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 529

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 30/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
23 Aug — 30 Aug1
1 adult

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 August 2025.

Round-trip from

C$ 551

One-way from

C$ 529

Popular in

December

Cheapest in

October

Average price

C$ 921

Good round-trip deal

C$ 656 or less

Good one-way deal

C$ 697 or less
Icelandair
  • Icelandair
  • 29/9-15/10
  • Nonstop
  • 15h 30m total
  • Seattle to Reykjavik
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30/8
  • 30/8
  • 3 total stops
  • 57h 05m total
  • Seattle to Reykjavik
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Highest demand for flights based on searches. 9% potential increase in price (C$ 136 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 24 potential savings vs. average RT price).
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Average for round-trip flights in August 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 18 August 2025.

Tue 23/97:00 p.m.SEA - KEF
Nonstop7h 25mIcelandair
Thu 9/107:45 p.m.KEF - SEA
Nonstop7h 55mIcelandair
Deal found 17/8C$ 551
Sun 24/87:00 p.m.SEA - KEF
Nonstop7h 25mIcelandair
Thu 11/97:45 p.m.KEF - SEA
Nonstop7h 55mIcelandair
Deal found 18/8C$ 567
Sat 6/97:15 a.m.SEA - KEF
1 stop17h 55mUnited Airlines
Sun 14/99:30 a.m.KEF - SEA
2 stops43h 50mUnited Airlines
Deal found 17/8C$ 632
Wed 27/811:54 p.m.SEA - KEF
2 stops25h 16mUnited Airlines
Wed 10/99:30 a.m.KEF - SEA
2 stops43h 50mUnited Airlines
Deal found 18/8C$ 639
Thu 28/87:20 a.m.SEA - KEF
1 stop17h 50mUnited Airlines
Mon 8/99:50 a.m.KEF - SEA
2 stops41h 52mUnited Airlines
Deal found 18/8C$ 642
Sat 6/911:10 p.m.SEA - KEF
1 stop24h 50mMultiple Airlines
Sun 14/99:30 a.m.KEF - SEA
2 stops35h 46mMultiple Airlines
Deal found 17/8C$ 643
Tue 26/88:45 a.m.SEA - KEF
2 stops16h 45mUnited Airlines
Fri 5/99:30 a.m.KEF - SEA
2 stops42h 12mUnited Airlines
Deal found 18/8C$ 645
Mon 15/911:54 p.m.SEA - KEF
2 stops25h 16mUnited Airlines
Mon 22/99:50 a.m.KEF - SEA
2 stops37h 01mUnited Airlines
Deal found 17/8C$ 647
Sat 30/87:20 a.m.SEA - KEF
1 stop17h 50mUnited Airlines
Fri 12/99:30 a.m.KEF - SEA
1 stop17h 01mUnited Airlines
Deal found 18/8C$ 650
Mon 13/106:00 a.m.SEA - KEF
1 stop17h 20mDelta
Thu 23/1011:25 a.m.KEF - SEA
1 stop15h 51mDelta
Deal found 18/8C$ 657

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 August 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

Mon 13/10

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Wed 22/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 24/9

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Mon 6/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 22/9

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Wed 1/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 23/9

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Wed 8/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 23/9

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

Nonstop7h 30m

Reykjavik Keflavik Intl

Tue 7/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 29/9

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

Nonstop7h 30m

Reykjavik Keflavik Intl

Wed 8/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 18/10

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

Nonstop7h 30m

Reykjavik Keflavik Intl

Fri 24/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 17/10

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

Nonstop7h 30m

Reykjavik Keflavik Intl

Mon 20/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 16/10

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

Nonstop7h 25m

Reykjavik Keflavik Intl

Fri 24/10

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

Nonstop7h 55m

C$ 551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 26/9

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

Nonstop7h 30m

Reykjavik Keflavik Intl

Tue 7/10

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

Nonstop7h 55m

C$ 551

Flights are sorted by cheapest round-trip flights first.

Deals found on 18/8

Showing 1-10 of 21 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 8 August 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 81 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 18 August 2025.

It’s typically best to fly out from Seattle to Reykjavik Keflavik Intl Airport in the morning. Doing so could potentially save you 18% on the flight price compared to flying at noon, which is usually more expensive.

Weekly flight availability from Seattle to Reykjavik Keflavik Intl Airport

Explore weekly flight availability from Seattle to Keflavik Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 18 August 2025.

The most flights from SEA to KEF are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

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 6 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 25m. 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$ 760 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 358 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
Selfoss

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

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