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Keflavik Intl

$223+ 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 3/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Feb 26 — Mar 51
Wed 2/26
Wed 3/5
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Reykjavik Keflavik Intl are usually found in May or November, booked 81 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap 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 February 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$548
(Expedia)

One-way from

$223
(Trip.com)

Popular in

December

Cheapest in

May

Average price

$774

Good round-trip deal

$585 or less

Good one-way deal

$414 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
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Highest demand for flights based on searches. 0% potential increase in price ($0 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
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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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Find 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 February 21, 2025.

This Expedia deal was found by Cheapflights users on 2/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/237:00 pmSEA - KEF
Nonstop7h 25mIcelandair
Wed 4/307:45 pmKEF - SEA
Nonstop7h 55mIcelandair
Deal found 2/20$548
This Lufthansa deal was found by Cheapflights users on 2/20. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/26:50 pmSEA - KEF
1 stop22h 20mLufthansa
Mon 4/712:25 amKEF - SEA
1 stop19h 00mLufthansa
Deal found 2/20$551
This Kiwi.com deal was found by Cheapflights users on 2/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/211:30 pmSEA - KEF
1 stop22h 15mMultiple Airlines
Tue 4/83:45 pmKEF - SEA
1 stop25h 43mMultiple Airlines
Deal found 2/20$561
This Air France deal was found by Cheapflights users on 2/20. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/16:00 amSEA - KEF
2 stops20h 30mAir France
Tue 4/811:25 amKEF - SEA
1 stop18h 09mAir France
Deal found 2/20$563
This Delta deal was found by Cheapflights users on 2/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1310:59 pmSEA - KEF
1 stop27h 31mDelta
Tue 4/2211:25 amKEF - SEA
1 stop15h 38mDelta
Deal found 2/19$564
This Ovago deal was found by Cheapflights users on 2/19. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/111:25 pmSEA - KEF
2 stops38h 20mBritish Airways
Thu 3/2011:40 amKEF - SEA
1 stop31h 40mBritish Airways
Deal found 2/19$570
This Booking.com deal was found by Cheapflights users on 2/21. 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.
Sat 9/67:20 amSEA - KEF
2 stops42h 15mAir Canada
Wed 9/1710:00 amKEF - SEA
2 stops34h 05mAir Canada
Deal found 2/21$632
This KLM deal was found by Cheapflights users on 2/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/47:18 amSEA - KEF
1 stop19h 12mKLM
Sun 5/118:50 amKEF - SEA
2 stops20h 35mKLM
Deal found 2/20$651
This StudentUniverse deal was found by Cheapflights users on 2/20. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/75:40 pmSEA - KEF
1 stop31h 20mFinnair
Mon 5/128:45 amKEF - SEA
1 stop14h 15mFinnair
Deal found 2/20$704
This United deal was found by Cheapflights users on 2/20. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/265:00 pmSEA - KEF
2 stops32h 10mUnited Airlines
Fri 9/512:00 pmKEF - SEA
3 stops31h 20mUnited Airlines
Deal found 2/20$711

Find flights from Seattle to Keflavik Intl within your budget

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 February 21, 2025.

Fly from

Seattle

Fly to

Keflavik Intl

Route

Depart

Return

Price

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 4/23

7:00 pm-9:25 am

Nonstop7h 25m

Reykjavik Keflavik Intl

Wed 4/30

7:45 pm-8:40 pm

Nonstop7h 55m

$548

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 4/2

6:50 pm-12:10 am

1 stop22h 20m

Reykjavik Keflavik Intl

Mon 4/7

12:25 am-12:25 pm

1 stop19h 00m

$551

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 4/2

11:30 pm-4:45 am

1 stop22h 15m

Reykjavik Keflavik Intl

Tue 4/8

3:45 pm-10:28 am

1 stop25h 43m

$561

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 4/1

6:00 am-9:30 am

2 stops20h 30m

Reykjavik Keflavik Intl

Tue 4/8

11:25 am-10:34 pm

1 stop18h 09m

$563

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 4/13

10:59 pm-9:30 am

1 stop27h 31m

Reykjavik Keflavik Intl

Tue 4/22

11:25 am-8:03 pm

1 stop15h 38m

$564

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 3/11

1:25 pm-10:45 am

2 stops38h 20m

Reykjavik Keflavik Intl

Thu 3/20

11:40 am-12:20 pm

1 stop31h 40m

$570

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 4/23

1:35 pm-4:30 pm

2 stops19h 55m

Reykjavik Keflavik Intl

Wed 4/30

8:45 am-11:09 pm

2 stops21h 24m

$603

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 8/16

7:15 pm-8:35 am

2 stops30h 20m

Reykjavik Keflavik Intl

Thu 8/28

10:00 am-1:01 pm

2 stops34h 01m

$639

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 5/4

7:18 am-9:30 am

1 stop19h 12m

Reykjavik Keflavik Intl

Sun 5/11

8:50 am-10:25 pm

2 stops20h 35m

$651

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 8/17

12:30 am-7:00 am

2 stops23h 30m

Reykjavik Keflavik Intl

Tue 8/26

12:00 pm-12:08 am

1 stop19h 08m

$728

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 20 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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 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.

Travel insights for flights from Seattle to Keflavik Intl

Get recent, data-driven insights about flights from Seattle to Keflavik Intl including ideal travel times, pricing trends, and more.

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 February 14, 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 44 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, November is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of $328). Flying from Seattle to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $657). 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 February 21, 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 afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 31% 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. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to Reykjavik Keflavik Intl Airport

Explore weekly flight availability from Seattle to Keflavik Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated February 21, 2025.

The most flights from SEA to KEF are scheduled on a Monday (2 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Keflavik Intl by month

Plan your trip to Keflavik Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Reykjavik Keflavik Intl Airport ranges from 1.6 - 3.1 inches per month. January is typically the wettest month, when rainfall can reach 3.1 in. May is typically the driest time to visit Reykjavik Keflavik Intl Airport when rainfall is around 1.6 in.

Temperature in Keflavik Intl by month

Plan your trip to Keflavik Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Reykjavik Keflavik Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 51.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 February 21, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta and KLM from Seattle to Reykjavik by reading reviews from past customers. 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.
Alaska Airlines
8.0
Very good
9,697 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Alaska Airlines
8.0
Very good
9,697 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Delta
8.0
Very good
8,213 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

KLM
7.8
Good
1,331 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Finnair
7.6
Good
1,273 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Air France
7.4
Good
1,449 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Reviews

1 / 20

8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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 4 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

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

    Currently priced at $548, 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. Search Cheapflights for deals from Lufthansa and Air France - these airlines can fly you to your destination from $551 and $563, respectively. You may be able to fly from Seattle to Reykjavik Keflavik Intl Airport for 28% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Seattle to Reykjavik Keflavik Intl Airport one-way?

    For one-way options, check prices for Icelandair. According to our data, you can fly for as low as $495. Users have also found prices from $504 and $511 on WestJet and Air France, respectively.

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

    Consider Alaska Airlines (88%), Icelandair (88%) or airBaltic (70%) 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 $319. While the most popular route (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) can be booked for $488 on average our data indicates $1,318 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, November is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of $328). Flying from Seattle to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $657). 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

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Alternative routes for Seattle to Keflavik Intl

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Top 4 airlines flying from Seattle to Keflavik Intl

Discover the top 4 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 February 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$417Average$556FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$454Average$504FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$485Average$593FlexibilityNo cancel feeOn-time69%
IcelandairCheapest$638Average$782FlexibilityNo cancel feeOn-time76%
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