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Keflavik Intl

$312+ 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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Aug 24 — Aug 311
Mon 8/24
Mon 8/31
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 May or January, booked 90 days in advance, depart on a Wednesday or Tuesday and return on a Friday

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 July 25, 2026.

This Gotogate deal was found by Cheapflights users on 7/22. 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 7/2310:45 am
SEA
-
KEF
2 stops38h 10m
Air Canada
Wed 7/299:50 am
KEF
-
SEA
1 stop18h 17m
Air Canada
Deal found 7/22$482
This Flybillet deal was found by Cheapflights users on 7/20. 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 Flybillet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/217:20 pm
SEA
-
KEF
2 stops29h 35m
Air Canada
Mon 7/279:15 am
KEF
-
SEA
2 stops42h 52m
Air Canada
Deal found 7/20$487
This Flysmarter deal was found by Cheapflights users on 7/20. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2312:05 pm
SEA
-
KEF
1 stop11h 55m
Virgin Atlantic
Wed 7/2911:25 am
KEF
-
SEA
1 stop16h 11m
Virgin Atlantic
Deal found 7/20$496
This United Airlines deal was found by Cheapflights users on 7/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:15 am
SEA
-
KEF
1 stop17h 15m
United Airlines
Mon 7/2712:00 pm
KEF
-
SEA
1 stop28h 40m
United Airlines
Deal found 7/20$509
This Delta deal was found by Cheapflights users on 7/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/239:05 am
SEA
-
KEF
1 stop14h 55m
Delta
Wed 7/299:30 am
KEF
-
SEA
1 stop32h 29m
Delta
Deal found 7/22$514
This CheapOair deal was found by Cheapflights users on 7/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:45 am
SEA
-
KEF
2 stops43h 10m
Air Canada
Tue 7/2810:00 am
KEF
-
SEA
1 stop18h 07m
Air Canada
Deal found 7/19$515
This Virgin Atlantic deal was found by Cheapflights users on 7/20. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:45 am
SEA
-
KEF
1 stop14h 55m
Virgin Atlantic
Fri 7/319:30 am
KEF
-
SEA
1 stop21h 28m
Virgin Atlantic
Deal found 7/20$516

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 July 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$518
(Delta)

One-way from

$312
(Trip.com)

Popular in

August

Cheapest in

May

Average price

$744

Good round-trip deal

$580 or less

Good one-way deal

$291 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Reykjavik Keflavik Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Reykjavik Keflavik Intl flights.
Search Deals
From Seattle/Tacoma Intl to Reykjavik Keflavik Intl
Search Deals
One-way flight from Seattle/Tacoma Intl to Reykjavik Keflavik Intl
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($122 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Reykjavik Keflavik Intl.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Reykjavik Keflavik Intl.
Search Deals

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 July 25, 2026.
Use the filters below to find and compare flights from Seattle to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 9/24

6:00 am-7:00 am

1 stop18h 00m

Reykjavik Keflavik Intl

Mon 10/5

9:30 am-4:45 pm

1 stop14h 15m

$619

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 9/19

7:15 am-9:30 am

1 stop19h 15m

Reykjavik Keflavik Intl

Fri 9/25

11:25 am-8:21 pm

1 stop15h 56m

$625

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 9/11

6:00 am-7:00 am

1 stop18h 00m

Reykjavik Keflavik Intl

Fri 9/18

11:25 am-11:20 pm

1 stop18h 55m

$628

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 9/9

6:00 am-7:00 am

1 stop18h 00m

Reykjavik Keflavik Intl

Thu 9/17

9:30 am-11:55 pm

1 stop21h 25m

$628

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 9/19

7:15 am-9:30 am

1 stop19h 15m

Reykjavik Keflavik Intl

Fri 9/25

11:25 am-10:05 pm

2 stops17h 40m

$632

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 9/23

7:15 am-9:30 am

1 stop19h 15m

Reykjavik Keflavik Intl

Wed 9/30

9:30 am-11:55 pm

1 stop21h 25m

$632

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 9/8

8:15 am-9:30 am

2 stops18h 15m

Reykjavik Keflavik Intl

Thu 9/17

11:25 am-8:21 pm

1 stop15h 56m

$632

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 9/11

5:50 pm-7:00 am

2 stops30h 10m

Reykjavik Keflavik Intl

Fri 9/18

11:25 am-10:05 pm

2 stops17h 40m

$641

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 8/28

11:59 pm-7:00 am

1 stop24h 01m

Reykjavik Keflavik Intl

Sat 9/5

11:25 am-11:57 pm

2 stops19h 32m

$641

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 10/1

6:00 am-7:00 am

1 stop18h 00m

Reykjavik Keflavik Intl

Tue 10/6

11:25 am-11:00 pm

1 stop18h 35m

$669

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/21

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy2 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. FlightHub >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 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 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?

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 89 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, May is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of $545). Flying from Seattle to Reykjavik Keflavik Intl Airport in August is currently the most expensive (average of $962). 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 July 25, 2026.

When flying from Seattle to Reykjavik Keflavik Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Seattle to Reykjavik Keflavik Intl Airport?

Airfare is below average for this route at the moment.

Seattle to Reykjavik Keflavik Intl Airport flights typically cost between $618 and $1,091 in September.
The cheapest round-trip price found within the last 5 days was $518 on Delta (Sep 9-Sep 15).

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 July 25, 2026.
Read through reviews of airlines operating flights from Seattle to Reykjavik Keflavik Intl Airport, such as Alaska Airlines and Icelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,707 reviews

Entertainment

7.0

Boarding

8.1

Food

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
Alaska Airlines
7.9
Good
12,707 reviews
Alaska Airlines
7.9
Good
12,707 reviews

Entertainment

7.0

Boarding

8.1

Food

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
Icelandair
7.0
Good
717 reviews
Alaska Airlines
7.9
Good
12,707 reviews

Entertainment

7.0

Boarding

8.1

Food

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle

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 6 outbound flights 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 Delta, Virgin Atlantic, and KLM fly from Seattle to Reykjavik Keflavik Intl Airport in about 18h. The time it takes to get you to your destination can typically vary by up to 1h 15m. 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 $413, Icelandair will fly you from Seattle to Reykjavik Keflavik Intl Airport and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Alaska Airlines for as low as $494. You may be able to fly from Seattle to Reykjavik Keflavik Intl Airport for 39% less than the average price by searching for these airlines.

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

    Looking at all options, your cheapest flight can be booked for $198. While the most popular route (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) can be booked for $523 on average, our data indicates $1,829 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, May is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of $545). Flying from Seattle to Reykjavik Keflavik Intl Airport in August is currently the most expensive (average of $962). 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

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Portland 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 July 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$413Average$639FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$494Average$810FlexibilityNo cancel feeOn-time75%

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