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$390+ Cheap flights from Keflavik Intl (KEF) to Seattle (SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/20. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
Nov 19 — Nov 261
Wed 11/19
Wed 11/26
1 adult, Economy
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Cheap 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 October 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$390
(Booking.com)

Popular in

December

Cheapest in

February

Average price

$798

Good one-way deal

$638 or less
Provider with most accurate pricing for Reykjavik Keflavik Intl-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Reykjavik Keflavik Intl-Seattle/Tacoma Intl flights.
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From Reykjavik Keflavik Intl to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 17% potential increase in price ($172 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($48 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a one-way flight from Reykjavik Keflavik Intl to Seattle/Tacoma Intl.
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Find 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 October 20, 2025.

This Booking.com deal was found by Cheapflights users on 10/18. 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.
Thu 11/205:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Wed 11/262:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Deal found 10/18$390
This Booking.com deal was found by Cheapflights users on 10/19. 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.
Wed 12/35:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Wed 12/102:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Deal found 10/19$609
This Kiwi.com deal was found by Cheapflights users on 10/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/35:00 pmKEF - SEA
1 stop14h 19mMultiple Airlines
Wed 12/108:44 amSEA - KEF
1 stop13h 31mMultiple Airlines
Deal found 10/19$642
This FlightHub deal was found by Cheapflights users on 10/19. 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.
Tue 12/165:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Tue 12/302:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Deal found 10/19$668
This FlightHub deal was found by Cheapflights users on 10/20. 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.
Mon 11/174:50 pmKEF - SEA
1 stop11h 43mIcelandair
Mon 11/242:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Deal found 10/20$684
This Gotogate deal was found by Cheapflights users on 10/20. 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 10/247:45 pmKEF - SEA
Nonstop7h 55mIcelandair
Wed 10/293:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Deal found 10/20$722

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 October 20, 2025.
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

Thu 11/20

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Wed 11/26

2:35 pm-6:15 am

Nonstop7h 40m

$390

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Wed 12/3

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Wed 12/10

2:35 pm-6:15 am

Nonstop7h 40m

$609

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Tue 12/16

5:00 pm-5:00 pm

Nonstop8h 00m

Seattle/Tacoma Intl

Tue 12/30

2:35 pm-6:15 am

Nonstop7h 40m

$668

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 11/17

4:50 pm-8:33 pm

1 stop11h 43m

Seattle/Tacoma Intl

Mon 11/24

2:35 pm-6:15 am

Nonstop7h 40m

$684

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 10/24

7:45 pm-8:40 pm

Nonstop7h 55m

Seattle/Tacoma Intl

Wed 10/29

3:35 pm-6:15 am

Nonstop7h 40m

$722

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 11/20

4:55 pm-10:55 pm

1 stop14h 00m

Seattle/Tacoma Intl

Wed 11/26

2:35 pm-6:15 am

Nonstop7h 40m

$747

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 2/9

6:05 pm-2:19 pm

2 stops52h 14m

$431

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 2/7

5:15 pm-10:21 am

3 stops49h 06m

$447

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 11/24

4:50 pm-6:24 am

1 stop21h 34m

$488

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sun 2/8

9:35 am-7:52 pm

3 stops42h 17m

$488

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/18

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 October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 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 October 20, 2025.

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.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated October 20, 2025.
Read reviews from past customers who have flown Icelandair from Reykjavik Keflavik Intl Airport to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Icelandair
7.0
Good
561 reviews

Food

6.2

Entertainment

7.0

Overall

7.0

Comfort

6.9

Crew

8.1

Boarding

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

KEF - EWR

The airport in Reykjavik had too few seats at the departure gate. Otherwise the airport experience was fine. The flight was timely and smooth. The airplane was well maintained and staff pleasant and efficient
Icelandair
7.0
Good
561 reviews
Icelandair
7.0
Good
561 reviews

Food

6.2

Entertainment

7.0

Overall

7.0

Comfort

6.9

Crew

8.1

Boarding

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

KEF - EWR

The airport in Reykjavik had too few seats at the departure gate. Otherwise the airport experience was fine. The flight was timely and smooth. The airplane was well maintained and staff pleasant and efficient

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. 1 airline 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 3 inbound flights 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. 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 is the cheapest airline to fly from Reykjavik Keflavik Intl Airport to Seattle round-trip?

    Flying on Icelandair is currently your cheapest option to Seattle, with prices starting at $639. You may be able to fly from Reykjavik Keflavik Intl Airport to Seattle for 24% less than the average price by searching for this airline.

  • 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 $1,316, our data shows the cheapest flight currently is $488. When looking at the most popular route, (Reykjavik Keflavik Intl - Seattle/Tacoma Intl), you can expect to pay $390 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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Top airline flying from Keflavik Intl to Seattle

Discover the top airline that operate flights from Keflavik Intl to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$639Average$798FlexibilityNo cancel feeOn-time76%

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