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$359+ 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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
Aug 3 — Aug 101
Mon 8/3
Mon 8/10
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 July 4, 2026.

This Ticket deal was found by Cheapflights users on 7/1. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/167:45 pm
KEF
-
SEA
Nonstop7h 55m
Icelandair
Wed 7/227:00 pm
SEA
-
KEF
Nonstop7h 25m
Icelandair
Deal found 7/1$590
This Ticket deal was found by Cheapflights users on 7/3. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/310:40 am
KEF
-
SEA
Nonstop8h 05m
Icelandair
Wed 8/1211:25 pm
SEA
-
KEF
Nonstop7h 35m
Icelandair
Deal found 7/3$612
This SmartFares deal was found by Cheapflights users on 7/3. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/312:45 pm
KEF
-
SEA
Nonstop7h 55m
Alaska Airlines
Wed 8/126:35 pm
SEA
-
KEF
Nonstop7h 25m
Alaska Airlines
Deal found 7/3$626
This Gotogate deal was found by Cheapflights users on 7/3. 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 12/115:00 pm
KEF
-
SEA
Nonstop8h 00m
Icelandair
Mon 12/142:35 pm
SEA
-
KEF
Nonstop7h 40m
Icelandair
Deal found 7/3$627
This Gotogate deal was found by Cheapflights users on 6/30. 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.
Thu 7/1610:40 am
KEF
-
SEA
Nonstop8h 05m
Icelandair
Sat 7/2511:25 pm
SEA
-
KEF
Nonstop7h 35m
Icelandair
Deal found 6/30$633
This Gotogate deal was found by Cheapflights users on 7/2. 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 8/2410:40 am
KEF
-
SEA
Nonstop8h 05m
Icelandair
Sun 8/303:40 pm
SEA
-
KEF
Nonstop7h 35m
Icelandair
Deal found 7/2$636
This Booking.com deal was found by Cheapflights users on 7/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/117:45 pm
KEF
-
SEA
Nonstop7h 55m
Icelandair
Mon 10/197:00 pm
SEA
-
KEF
Nonstop7h 25m
Icelandair
Deal found 7/2$641
This Booking.com deal was found by Cheapflights users on 6/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:45 pm
KEF
-
SEA
Nonstop7h 55m
Icelandair
Tue 8/1811:25 pm
SEA
-
KEF
Nonstop7h 35m
Icelandair
Deal found 6/29$648
This Super.com deal was found by Cheapflights users on 6/30. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1610:40 am
KEF
-
SEA
Nonstop8h 05m
Icelandair
Mon 7/2011:25 pm
SEA
-
KEF
Nonstop7h 35m
Icelandair
Deal found 6/30$650
This Gotogate deal was found by Cheapflights users on 7/1. 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.
Sat 8/2910:40 am
KEF
-
SEA
Nonstop8h 05m
Icelandair
Mon 9/711:25 pm
SEA
-
KEF
Nonstop7h 35m
Icelandair
Deal found 7/1$654
This FlightHub deal was found by Cheapflights users on 7/3. 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.
Fri 7/2410:40 am
KEF
-
SEA
Nonstop8h 05m
Icelandair
Fri 7/3111:25 pm
SEA
-
KEF
Nonstop7h 35m
Icelandair
Deal found 7/3$660

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 July 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$590
(Ticket)

One-way from

$359
(Kiwi.com)

Good one-way deal

$568 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
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 July 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 8/20

12:45 pm-1:40 pm

Nonstop7h 55m

Seattle/Tacoma Intl

Wed 8/26

6:35 pm-9:00 am

Nonstop7h 25m

$671

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 7/30

7:45 pm-8:40 pm

Nonstop7h 55m

Seattle/Tacoma Intl

Thu 8/6

3:40 pm-6:15 am

Nonstop7h 35m

$684

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 9/26

5:10 pm-1:45 pm

1 stop27h 35m

Seattle/Tacoma Intl

Fri 10/2

3:55 pm-5:45 pm

2 stops18h 50m

$721

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 8/29

9:00 am-6:45 pm

1 stop16h 45m

Seattle/Tacoma Intl

Mon 9/7

7:00 am-7:40 am

1 stop17h 40m

$748

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 7/16

10:40 am-11:45 am

Nonstop8h 05m

Seattle/Tacoma Intl

Sat 7/25

10:40 pm-9:40 am

1 stop28h 00m

$758

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sun 10/11

7:45 pm-8:40 pm

Nonstop7h 55m

Seattle/Tacoma Intl

Mon 10/19

12:13 pm-6:05 am

1 stop10h 52m

$774

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 8/24

11:15 am-1:45 pm

2 stops33h 30m

Seattle/Tacoma Intl

Sun 8/30

3:55 pm-10:25 am

2 stops35h 30m

$777

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 7/16

9:00 am-7:07 am

2 stops29h 07m

Seattle/Tacoma Intl

Sat 7/25

10:30 am-7:40 am

1 stop14h 10m

$820

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 8/8

10:40 am-11:45 am

Nonstop8h 05m

Seattle/Tacoma Intl

Mon 8/10

8:11 pm-6:00 am

1 stop26h 49m

$858
Cheapest one-way

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 7/25

9:00 am-8:50 pm

2 stops18h 50m

$459

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 17 resultsSorted by cheapest first
1
2
  • 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 July 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 6 inbound flights from Reykjavik Keflavik Intl per day.

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

    Airlines like Alaska Airlines, Icelandair, and Scandinavian Airlines fly from Reykjavik Keflavik Intl Airport to Seattle in about 7h 55m. The time it takes to get you to your destination can typically vary by up to 19h 40m. The distance from Reykjavik Keflavik Intl Airport to Seattle is about 3608 mi. This flight may include one or multiple stops.

  • 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 $1,061, our data shows the cheapest flight currently is $502. When looking at the most popular route, (Reykjavik Keflavik Intl - Seattle/Tacoma Intl), you can expect to pay $641 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

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