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Cheap flights from Reykjavik Keflavik Intl Airport to Seattle from $425

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Reykjavik Keflavik Intl Airport to Seattle departing on 2/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Reykjavik Keflavik Intl Airport to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
5:00 pm - 6:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
3:40 pm - 6:15 am
SEA
-
KEF
7h 35mnonstop
$633Icelandair
Fri, Mar 27 - Tue, Apr 7
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$634Icelandair
Wed, Feb 25 - Wed, Mar 4
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$644Icelandair
Tue, Feb 24 - Tue, Mar 3
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$655Icelandair
Mon, Feb 23 - Thu, Mar 5
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$656Icelandair
Thu, Feb 26 - Tue, Mar 3
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$667Icelandair
Mon, Feb 23 - Sat, Mar 7
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$676Icelandair
Mon, Feb 23 - Fri, Mar 6
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$678Icelandair
Sat, Feb 28 - Wed, Mar 4
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$688Icelandair
Thu, Feb 26 - Fri, Mar 6
Icelandair Logo
5:00 pm - 5:00 pm
KEF
-
SEA
8h 00mnonstop
Icelandair Logo
2:35 pm - 6:15 am
SEA
-
KEF
7h 40mnonstop
$697Icelandair
Thu, Jan 22 - Mon, Jan 26

Icelandair flights from Reykjavik Keflavik Intl Airport to Seattle

Our best Icelandair deals on Reykjavik Keflavik Intl Airport to Seattle flight tickets
Icelandair
Mar 27
KEF5:00 pmReykjavik Keflavik Intl
8h 00m
SEA6:00 pmSeattle/Tacoma Intl
Apr 7
SEA3:40 pmSeattle/Tacoma Intl
7h 35m
KEF6:15 amReykjavik Keflavik Intl
$633
Find similar
Icelandair
Feb 25
KEF5:00 pmReykjavik Keflavik Intl
8h 00m
SEA5:00 pmSeattle/Tacoma Intl
Mar 4
SEA2:35 pmSeattle/Tacoma Intl
7h 40m
KEF6:15 amReykjavik Keflavik Intl
$634
Find similar
Icelandair
Feb 24
KEF5:00 pmReykjavik Keflavik Intl
8h 00m
SEA5:00 pmSeattle/Tacoma Intl
Mar 3
SEA2:35 pmSeattle/Tacoma Intl
7h 40m
KEF6:15 amReykjavik Keflavik Intl
$644
Find similar

Scandinavian Airlines flights from Reykjavik Keflavik Intl Airport to Seattle

Our best Scandinavian Airlines deals on Reykjavik Keflavik Intl Airport to Seattle flight tickets
Scandinavian Airlines
Feb 23
KEF3:40 pmReykjavik Keflavik Intl
38h 42m
2 stops
SEA10:22 pmSeattle/Tacoma Intl
Mar 1
SEA7:10 amSeattle/Tacoma Intl
32h 10m
2 stops
KEF11:20 pmReykjavik Keflavik Intl
$776
Find similar
Scandinavian Airlines
Feb 9
KEF7:35 amReykjavik Keflavik Intl
22h 49m
2 stops
SEA10:24 pmSeattle/Tacoma Intl
Feb 17
SEA11:17 amSeattle/Tacoma Intl
28h 38m
2 stops
KEF11:55 pmReykjavik Keflavik Intl
$804
Find similar
Scandinavian Airlines
Feb 25
KEF11:30 amReykjavik Keflavik Intl
43h 42m
2 stops
SEA11:12 pmSeattle/Tacoma Intl
Mar 1
SEA7:10 amSeattle/Tacoma Intl
43h 35m
2 stops
KEF10:45 amReykjavik Keflavik Intl
$810
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Reykjavik Keflavik Intl Airport 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, momondo users made 832,500 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from Reykjavik Keflavik Intl Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 3/27

5:00 pm-6:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Tue 4/7

3:40 pm-6:15 am

Nonstop7h 35m

$633

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Wed 2/25

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Wed 3/4

2:35 pm-6:15 am

Nonstop7h 40m

$634

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Tue 2/24

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Tue 3/3

2:35 pm-6:15 am

Nonstop7h 40m

$644

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 2/23

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Thu 3/5

2:35 pm-6:15 am

Nonstop7h 40m

$655

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 2/26

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Tue 3/3

2:35 pm-6:15 am

Nonstop7h 40m

$656

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 2/23

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Sat 3/7

2:35 pm-6:15 am

Nonstop7h 40m

$667

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 2/23

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Fri 3/6

2:35 pm-6:15 am

Nonstop7h 40m

$676

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 2/28

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Wed 3/4

2:35 pm-6:15 am

Nonstop7h 40m

$678

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 2/26

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Fri 3/6

2:35 pm-6:15 am

Nonstop7h 40m

$688

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 1/22

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Mon 1/26

2:35 pm-6:15 am

Nonstop7h 40m

$697

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Reykjavik Keflavik Intl Airport to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Reykjavik Keflavik Intl Airport is on a Monday. momondo users have found tickets for Monday departures for as low as $693. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Reykjavik Keflavik Intl Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $922.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Reykjavik Keflavik Intl Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $659 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $903. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Reykjavik Keflavik Intl to Seattle/Tacoma Intl flight route?

Fly from Reykjavik Keflavik Intl to Seattle/Tacoma Intl for the best Reykjavik Keflavik Intl - Seattle/Tacoma Intl flight prices

What cabin class options are available on Reykjavik Keflavik Intl to Seattle/Tacoma Intl flights?

There are 3 cabin classes available to choose from on Reykjavik Keflavik Intl to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Reykjavik Keflavik Intl Airport to Seattle flights?

You could potentially save up to 23% on your flight if you consider stops on a Reykjavik Keflavik Intl Airport to Seattle flight.

How have Reykjavik Keflavik Intl Airport to Seattle flight prices changed over time?

As of December 2025, prices for Reykjavik Keflavik Intl Airport to Seattle flights are approximately 26% more expensive when compared to flights at the same time last year.

When to book flights from Reykjavik Keflavik Intl Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Reykjavik Keflavik Intl Airport to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Reykjavik Keflavik Intl Airport to Seattle (KEF to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Reykjavik Keflavik Intl Airport to Seattle

Fastest flight time

8h 00m

Direct flights

Every day

Airports in Seattle

1 airport
The fastest flight from Reykjavik Keflavik Intl Airport to Seattle takes 8h 00m
Direct flights go from Reykjavik Keflavik Intl Airport to Seattle every day.
There is 1 airport in Seattle. From Reykjavik Keflavik Intl Airport there are direct flights to Seattle/Tacoma Intl (SEA).
Search flight deals

  • How far is Reykjavik Keflavik Intl to Seattle/Tacoma Intl by plane?

    The distance between Reykjavik Keflavik Intl and Seattle/Tacoma Intl is about 3599.8 mi. Flights usually cover this in 8h 00m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Reykjavik Keflavik Intl Airport to Seattle?

  • What is the most popular airline from Reykjavik Keflavik Intl Airport to Seattle?

Best airlines flying from Reykjavik Keflavik Intl Airport to Seattle

Compare and see reviews for airlines that fly from Reykjavik Keflavik Intl Airport to Seattle with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $639Free CancellationRating
7.0
591 reviews
Search Icelandair flights

  • Icelandair Flights From Reykjavik Keflavik Intl Airport to Seattle

    The lowest priced Icelandair flight from Reykjavik Keflavik Intl Airport to Seattle from the last 72 hours was $639. Generally, Icelandair has 4 flights on this route every week with an average price of $759. Icelandair is rated 7.0/10 by our users.

Traveling to a place near Seattle?

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Why use momondo?

Why should I use momondo to find a flight deal from Reykjavik to Seattle?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Reykjavik to Seattle. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Reykjavik to Seattle with flexible booking policies on momondo?

Yes. All flights to Seattle from Reykjavik on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Reykjavik to Seattle?

Once you have performed a search for Reykjavik to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Reykjavik to Seattle right now. Can momondo alert me if prices change?

Price alerts on flights to Seattle from Reykjavik are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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