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Keflavik Intl

$247+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Apr 21 — Apr 281
Mon 4/21
Mon 4/28
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Reykjavik Keflavik Intl are usually found in May or April, booked 16 days in advance, depart on a Tuesday or Monday 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 April 16, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$512
(Flightnetwork)

One-way from

$247
(Justfly.com)

Popular in

December

Cheapest in

May

Average price

$706

Good round-trip deal

$539 or less

Good one-way deal

$263 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. 3% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 16, 2025.

This Flightnetwork deal was found by Cheapflights users on 4/15. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/107:00 pmSEA - KEF
Nonstop7h 25mIcelandair
Sat 5/174:50 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 4/15$512
This Kiwi.com deal was found by Cheapflights users on 4/14. 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.
Mon 6/237:05 amSEA - KEF
1 stop18h 10mWestJet
Mon 6/309:35 amKEF - SEA
1 stop10h 23mWestJet
Deal found 4/14$519
This Kiwi.com deal was found by Cheapflights users on 4/15. 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.
Fri 5/23:49 pmSEA - KEF
1 stop29h 56mMultiple Airlines
Tue 5/63:45 pmKEF - SEA
1 stop25h 28mMultiple Airlines
Deal found 4/15$541
This Yatra.com deal was found by Cheapflights users on 4/15. 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 Yatra.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/27:23 amSEA - KEF
1 stop19h 07mVirgin Atlantic
Mon 5/511:25 amKEF - SEA
2 stops19h 34mVirgin Atlantic
Deal found 4/15$554
This Air France deal was found by Cheapflights users on 4/15. 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 10/76:00 amSEA - KEF
1 stop17h 20mAir France
Tue 10/148:50 amKEF - SEA
1 stop16h 51mAir France
Deal found 4/15$562
This KLM deal was found by Cheapflights users on 4/15. 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.
Mon 5/125:50 pmSEA - KEF
2 stops29h 30mKLM
Fri 5/239:30 amKEF - SEA
1 stop17h 49mKLM
Deal found 4/15$565
This Delta deal was found by Cheapflights users on 4/16. 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 8/319:50 amSEA - KEF
1 stop13h 30mDelta
Sun 9/218:50 amKEF - SEA
1 stop18h 40mDelta
Deal found 4/16$574
This Justfly.com deal was found by Cheapflights users on 4/16. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/167:15 pmSEA - KEF
2 stops30h 00mAir Canada
Sun 8/249:30 amKEF - SEA
1 stop18h 11mAir Canada
Deal found 4/16$611
This United deal was found by Cheapflights users on 4/15. 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.
Wed 8/1312:20 amSEA - KEF
1 stop25h 10mUnited Airlines
Tue 8/2611:00 amKEF - SEA
1 stop14h 32mUnited Airlines
Deal found 4/15$627
This British Airways deal was found by Cheapflights users on 4/15. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/16:50 pmSEA - KEF
1 stop32h 00mBritish Airways
Thu 12/1111:40 amKEF - SEA
1 stop31h 40mBritish Airways
Deal found 4/15$671
This Lufthansa deal was found by Cheapflights users on 4/14. 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.
Tue 5/132:15 pmSEA - KEF
2 stops35h 05mLufthansa
Mon 5/1912:25 amKEF - SEA
1 stop19h 00mLufthansa
Deal found 4/14$698
This SWISS deal was found by Cheapflights users on 4/16. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/21:45 pmSEA - KEF
2 stops35h 35mSWISS
Tue 9/169:25 amKEF - SEA
2 stops40h 11mSWISS
Deal found 4/16$702

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 April 16, 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

Sat 5/10

7:00 pm-9:25 am

Nonstop7h 25m

Reykjavik Keflavik Intl

Sat 5/17

4:50 pm-5:50 pm

Nonstop8h 00m

$512

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 6/23

7:05 am-8:15 am

1 stop18h 10m

Reykjavik Keflavik Intl

Mon 6/30

9:35 am-12:58 pm

1 stop10h 23m

$519

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 5/2

3:49 pm-4:45 am

1 stop29h 56m

Reykjavik Keflavik Intl

Tue 5/6

3:45 pm-10:13 am

1 stop25h 28m

$541

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 5/2

7:23 am-9:30 am

1 stop19h 07m

Reykjavik Keflavik Intl

Mon 5/5

11:25 am-11:59 pm

2 stops19h 34m

$554

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 5/12

5:50 pm-6:20 am

2 stops29h 30m

Reykjavik Keflavik Intl

Fri 5/23

9:30 am-8:19 pm

1 stop17h 49m

$565

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 5/6

9:55 am-9:30 am

2 stops16h 35m

Reykjavik Keflavik Intl

Sat 5/17

11:25 am-10:23 pm

2 stops17h 58m

$570

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 4/29

11:24 am-9:30 am

1 stop15h 06m

Reykjavik Keflavik Intl

Mon 5/5

11:25 am-8:03 pm

1 stop15h 38m

$574

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 5/13

2:15 pm-8:20 am

2 stops35h 05m

Reykjavik Keflavik Intl

Mon 5/19

12:25 am-12:25 pm

1 stop19h 00m

$698

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 5/30

6:25 am-8:30 am

2 stops19h 05m

Reykjavik Keflavik Intl

Fri 6/6

9:30 am-12:59 am

2 stops46h 29m

$704

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 7/9

5:35 am-8:10 am

2 stops19h 35m

Reykjavik Keflavik Intl

Thu 7/17

9:30 am-9:21 am

2 stops30h 51m

$708

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 18 results
1
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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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Seattle-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 April 11, 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 16 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 July is currently the most expensive (average of $651). 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 April 16, 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 29% 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. Friday 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 April 16, 2025.

The most flights from SEA to KEF are scheduled on a Monday (4 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 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 April 16, 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
9,876 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

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
9,876 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

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
7,916 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

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
1,326 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

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
7.5
Good
1,435 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

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 😥
SWISS
7.5
Good
1,580 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

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 3 outbound flights 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 $512, 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 WestJet and Virgin Atlantic - these airlines can fly you to your destination from $519 and $554, respectively. You may be able to fly from Seattle to Reykjavik Keflavik Intl Airport for 32% 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 WestJet. According to our data, you can fly for as low as $247. Users have also found prices from $479 and $493 on Icelandair and Air France, respectively.

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

    Consider airBaltic (100%), Alaska Airlines (85%) or Icelandair (85%) 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 $194. While the most popular route (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) can be booked for $505 on average our data indicates $1,259 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 July is currently the most expensive (average of $651). 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 April 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$417Average$592FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$454Average$496FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$485Average$603FlexibilityNo cancel feeOn-time69%
IcelandairCheapest$535Average$763FlexibilityNo cancel feeOn-time76%

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