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$421+ Cheap flights from Keflavik Intl (KEF) to Seattle (SEA)

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 6/27. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
1 adult, Economy
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Cheap flight deals from Keflavik Intl to Seattle

Cheapest flights from Keflavik Intl to Seattle
Explore the most affordable flight options available from Keflavik Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.

This Flighttix deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/307:45 pm
KEF
-
SEA
Nonstop7h 55m
Icelandair
Mon 4/67:00 pm
SEA
-
KEF
Nonstop7h 25m
Icelandair
Deal found 2/2$558
This Mytrip deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/34:50 pm
KEF
-
SEA
Nonstop8h 05m
Icelandair
Wed 4/87:00 pm
SEA
-
KEF
Nonstop7h 25m
Icelandair
Deal found 2/2$576
This Gotogate deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/207:45 pm
KEF
-
SEA
Nonstop7h 55m
Icelandair
Fri 5/87:00 pm
SEA
-
KEF
Nonstop7h 25m
Icelandair
Deal found 2/2$654
This Flysmarter deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/307:55 pm
KEF
-
SEA
1 stop21h 45m
Multiple Airlines
Mon 4/67:00 pm
SEA
-
KEF
Nonstop7h 25m
Multiple Airlines
Deal found 2/2$656
This Trip.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/37:45 pm
KEF
-
SEA
Nonstop7h 55m
Multiple Airlines
Wed 4/88:41 am
SEA
-
KEF
1 stop17h 44m
Multiple Airlines
Deal found 2/2$674
This FlightHub deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/125:00 pm
KEF
-
SEA
Nonstop8h 00m
Icelandair
Mon 2/232:35 pm
SEA
-
KEF
Nonstop7h 40m
Icelandair
Deal found 2/3$695
This flugladen.de deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/65:00 pm
KEF
-
SEA
Nonstop8h 00m
Icelandair
Fri 2/272:35 pm
SEA
-
KEF
Nonstop7h 40m
Icelandair
Deal found 2/2$723
This Gotogate deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/135:00 pm
KEF
-
SEA
Nonstop8h 00m
Icelandair
Mon 2/232:35 pm
SEA
-
KEF
Nonstop7h 40m
Icelandair
Deal found 2/3$732
This Cheapflightsfares deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/125:00 pm
KEF
-
SEA
Nonstop8h 00m
Icelandair
Sun 2/222:35 pm
SEA
-
KEF
Nonstop7h 40m
Icelandair
Deal found 2/3$734
This FlightHub deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/115:00 pm
KEF
-
SEA
Nonstop8h 00m
Icelandair
Tue 2/242:35 pm
SEA
-
KEF
Nonstop7h 40m
Icelandair
Deal found 2/3$745

Find flight deals from Keflavik Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Keflavik Intl (KEF) to Seattle (SEA). 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 February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$558
(Flighttix)

One-way from

$421
(Mytrip)

Popular in

December

Cheapest in

May

Average price

$717

Good one-way deal

$645 or less
Provider with most accurate pricing for Reykjavik Keflavik Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Reykjavik Keflavik Intl-Seattle/Tacoma Intl flights.
Search Deals
From Reykjavik Keflavik Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Reykjavik Keflavik Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($118 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a one-way flight from Reykjavik Keflavik Intl to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Keflavik Intl to Seattle 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 2,558,603 searches. Data last updated February 4, 2026.
Use the filters below to find and compare flights from Reykjavik Keflavik Intl Airport to Seattle that are best for you.

Fly from

Keflavik Intl

Fly to

Seattle

Route

Depart

Return

Price

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 4/3

4:50 pm-5:55 pm

Nonstop8h 05m

Seattle/Tacoma Intl

Wed 4/8

7:00 pm-9:25 am

Nonstop7h 25m

$576

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 3/30

7:55 pm-10:40 am

1 stop21h 45m

Seattle/Tacoma Intl

Mon 4/6

7:00 pm-9:25 am

Nonstop7h 25m

$656

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 4/3

7:45 pm-8:40 pm

Nonstop7h 55m

Seattle/Tacoma Intl

Wed 4/8

8:41 am-9:25 am

1 stop17h 44m

$674

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 4/20

5:10 pm-11:32 am

1 stop25h 22m

Seattle/Tacoma Intl

Fri 5/8

7:00 pm-9:25 am

Nonstop7h 25m

$746

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 2/14

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Wed 2/25

2:35 pm-6:15 am

Nonstop7h 40m

$747

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 2/14

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Tue 2/24

2:35 pm-6:15 am

Nonstop7h 40m

$772

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 3/21

5:15 pm-9:00 am

1 stop22h 45m

Seattle/Tacoma Intl

Sat 3/28

7:00 pm-9:25 am

Nonstop7h 25m

$779

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 2/14

4:50 pm-10:05 am

1 stop25h 15m

Seattle/Tacoma Intl

Wed 2/25

9:49 am-6:40 am

1 stop12h 51m

$814

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 3/6

5:00 pm-10:19 am

3 stops49h 19m

$464

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 3/27

5:00 pm-10:40 am

1 stop24h 40m

$483

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/1

Showing 1-10 of 17 results
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Compare providers for flights from Keflavik Intl to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Keflavik Intl to Seattle in February.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Reykjavik Keflavik Intl Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Reykjavik Keflavik Intl Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Reykjavik Keflavik Intl Airport-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Reykjavik Keflavik Intl Airport-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Reykjavik Keflavik Intl Airport-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Keflavik Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Keflavik Intl 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 Reykjavik Keflavik Intl Airport to Seattle

What is the cheapest time of day to fly from KEF to SEA?

Find hourly flight availability from Keflavik Intl to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 4, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Reykjavik Keflavik Intl Airport to Seattle as you normally would.

Related info for your journey

Find useful and relevant information for your journey from Keflavik Intl to Seattle. 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 into for flights to Seattle from Reykjavik Keflavik Intl?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Reykjavik Keflavik Intl to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from Reykjavik Keflavik Intl on a regular basis. Booking flights from Reykjavik Keflavik Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 1 inbound flight from Reykjavik Keflavik Intl per day.

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

    Airlines like Icelandair fly from Reykjavik Keflavik Intl Airport to Seattle in about 8h 05m. The time it takes to get you to your destination is usually consistent. The distance from Reykjavik Keflavik Intl Airport to Seattle is about 3608 mi. All flights are typically nonstop.

  • What are the most reliable airlines from Reykjavik Keflavik Intl Airport to Seattle?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Reykjavik Keflavik Intl Airport to Seattle on time: Alaska Airlines (75%), Icelandair (75%), airBaltic (53%).

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

    While on average a flight from Reykjavik Keflavik Intl Airport to Seattle is generally $1,666, our data shows the cheapest flight currently is $514. When looking at the most popular route, (Reykjavik Keflavik Intl - Seattle/Tacoma Intl), you can expect to pay $576 for that flight.

  • Can I find deals for flights from Keflavik Intl to Seattle that include hotel bookings?

    Yes. In addition to deals on Keflavik Intl to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Keflavik Intl to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Keflavik Intl to Seattle.

  • Can I find deals for business class flights from Keflavik Intl to Seattle?

    Yes. Cheapflights offers flight deals from Keflavik Intl to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Seattle?

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Alternative routes for Keflavik Intl to Seattle

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