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Keflavik Intl

$320+ Cheap flights from Seattle (SEA) to Keflavik Intl (KEF)

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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Reykjavik Keflavik Intl are usually found in October or August, booked 67 days in advance, depart on a Wednesday or Monday and return on a Monday

Cheap 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 December 12, 2025.

This Alaska Airlines deal was found by Cheapflights users on 12/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:20 pmSEA - KEF
1 stop22h 55mAlaska Airlines
Mon 12/154:50 pmKEF - SEA
1 stop11h 59mAlaska Airlines
Deal found 12/9$1,224
This Cheapflightsfares deal was found by Cheapflights users on 12/10. 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.
Wed 12/242:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Wed 12/315:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 12/10$1,228
This KAYAK deal was found by Cheapflights users on 12/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:39 pmSEA - KEF
1 stop27h 56mMultiple Airlines
Fri 12/265:00 pmKEF - SEA
Nonstop8h 00mMultiple Airlines
Deal found 12/10$1,294
This Kiwi.com deal was found by Cheapflights users on 12/9. 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 12/103:10 pmSEA - KEF
2 stops35h 40mMultiple Airlines
Mon 12/154:50 pmKEF - SEA
1 stop25h 38mMultiple Airlines
Deal found 12/9$1,306
This Cheapflightsfares deal was found by Cheapflights users on 12/10. 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.
Wed 12/312:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Wed 1/75:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 12/10$1,399
This Trip.com deal was found by Cheapflights users on 12/11. 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.
Thu 12/1811:59 pmSEA - KEF
1 stop22h 36mMultiple Airlines
Thu 12/255:00 pmKEF - SEA
Nonstop8h 00mMultiple Airlines
Deal found 12/11$1,452
This Icelandair deal was found by Cheapflights users on 12/10. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/249:35 amSEA - KEF
1 stop12h 30mMultiple Airlines
Wed 12/315:00 pmKEF - SEA
Nonstop8h 00mMultiple Airlines
Deal found 12/10$1,554
This Trip.com deal was found by Cheapflights users on 12/9. 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 12/122:35 pmSEA - KEF
Nonstop7h 40mMultiple Airlines
Thu 12/184:55 pmKEF - SEA
1 stop23h 54mMultiple Airlines
Deal found 12/9$1,600

Find 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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$457
(CrystalTravel)

One-way from

$320
(Kiwi.com)

Popular in

February

Cheapest in

October

Average price

$603

Good round-trip deal

$428 or less

Good one-way deal

$425 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Reykjavik Keflavik Intl flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Reykjavik Keflavik Intl flights.
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From Seattle/Tacoma Intl to Reykjavik Keflavik Intl
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One-way flight from Seattle/Tacoma Intl to Reykjavik Keflavik Intl
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($56 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
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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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 2,558,603 searches. Data last updated December 12, 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 1/12

2:35 pm-6:15 am

Nonstop7h 40m

Reykjavik Keflavik Intl

Wed 1/21

5:00 pm-5:00 pm

Nonstop8h 00m

$473

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 4/19

3:40 pm-6:15 am

Nonstop7h 35m

Reykjavik Keflavik Intl

Thu 4/23

7:45 pm-8:40 pm

Nonstop7h 55m

$498

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 4/12

1:40 pm-9:30 am

1 stop12h 50m

Reykjavik Keflavik Intl

Wed 4/29

11:25 am-7:33 pm

1 stop15h 08m

$628

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 4/1

3:40 pm-6:15 am

Nonstop7h 35m

Reykjavik Keflavik Intl

Sat 4/11

4:50 pm-5:55 pm

Nonstop8h 05m

$690

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 4/12

1:40 pm-9:30 am

1 stop12h 50m

Reykjavik Keflavik Intl

Wed 4/29

11:25 am-12:01 am

2 stops19h 36m

$750

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 3/5

9:46 am-6:30 am

1 stop12h 44m

Reykjavik Keflavik Intl

Wed 3/11

5:00 pm-6:00 pm

Nonstop8h 00m

$754

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 1/15

2:35 pm-6:15 am

Nonstop7h 40m

Reykjavik Keflavik Intl

Tue 1/20

5:00 pm-10:34 am

1 stop25h 34m

$780

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 4/3

11:30 pm-9:30 am

2 stops51h 00m

Reykjavik Keflavik Intl

Sun 4/12

11:25 am-12:19 pm

2 stops31h 54m

$781

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 3/17

3:35 pm-6:15 am

Nonstop7h 40m

Reykjavik Keflavik Intl

Thu 3/26

4:55 pm-9:07 am

1 stop23h 12m

$788

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 4/24

11:45 am-9:30 am

1 stop14h 45m

Reykjavik Keflavik Intl

Sun 5/3

11:25 am-10:16 pm

1 stop17h 51m

$808

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 18 results
1
2

Compare providers for flights from Seattle to Keflavik Intl

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 Seattle to Keflavik Intl in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice 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 Seattle-Reykjavik Keflavik Intl Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Seattle-Reykjavik Keflavik Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Reykjavik Keflavik Intl Airport flights, Cheapflights users trust eDreams the most. eDreams 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 Seattle-Reykjavik Keflavik Intl Airport 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 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 December 5, 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 67 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, October is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of $352). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of $514). 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 December 12, 2025.

One of the essential ways to save on airfare from Seattle to Reykjavik Keflavik Intl Airport is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 17% on airfare.

What is the cheapest day to fly from Seattle to Reykjavik Keflavik Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Keflavik Intl. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Reykjavik Keflavik Intl Airport flight should consider departing on Friday mornings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Keflavik Intl

Get insights into the airlines that provide service to Keflavik Intl. 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 Keflavik Intl. Reviews last updated December 12, 2025.
Read through reviews of airlines operating flights from Seattle to Reykjavik Keflavik Intl Airport, such as Delta and Icelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,007 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,007 reviews
Delta
7.9
Good
8,007 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Icelandair
7.0
Good
589 reviews
Delta
7.9
Good
8,007 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Reykjavik Keflavik Intl. On average, Seattle/Tacoma Intl has 1 outbound flight to Reykjavik Keflavik Intl per day from 2 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

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

    Airlines like Icelandair and Delta fly from Seattle to Reykjavik Keflavik Intl Airport in about 7h 40m. The time it takes to get you to your destination can typically vary by up to 5h 10m. The distance from Seattle to Reykjavik Keflavik Intl Airport is about 3608 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to Reykjavik Keflavik Intl Airport round-trip?

    Currently priced at $323, Delta will fly you from Seattle to Reykjavik Keflavik Intl Airport and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Icelandair for as low as $394. You may be able to fly from Seattle to Reykjavik Keflavik Intl Airport for 50% less than the average price by searching for these airlines.

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

    Consider airBaltic (80%), Alaska Airlines (65%) or Icelandair (65%) when booking your flight. These represent the most reliable airlines when flying from Seattle to Reykjavik Keflavik Intl Airport.

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

    Looking at all options, your cheapest flight can be booked for $330. While the most popular route (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) can be booked for $457 on average, our data indicates $1,101 when flying from Seattle to Reykjavik Keflavik Intl Airport.

  • 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, October is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of $352). Flying from Seattle to Reykjavik Keflavik Intl Airport in May is currently the most expensive (average of $514). 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

Traveling to a place near Reykjavik Keflavik Intl Airport?

Book flights to Reykjavik Keflavik Intl Airport if you plan to visit one of these locations
Keflavik
Hveragerdi

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Alternative routes for Seattle to Keflavik Intl

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Keflavik Intl flights
Spokane to Keflavik Intl flights

Top 2 airlines flying from Seattle to Keflavik Intl

Discover the top 2 airlines that operate flights from Seattle to Keflavik Intl. 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$323Average$573FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$394Average$649FlexibilityNo cancel feeOn-time76%

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