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$285+ Cheap flights from Keflavik Intl (KEF) to Seattle (SEA)

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 7/7. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
May 4 — May 111
Sun 5/4
Sun 5/11
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 April 29, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$543
(Mytrip)

One-way from

$285
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$1,065

Good round-trip deal

$681 or less

Good one-way deal

$657 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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One-way flight from Reykjavik Keflavik Intl to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 21% potential increase in price ($214 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 April 2025
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Price to beat on a round-trip flight from Reykjavik Keflavik Intl to Seattle/Tacoma Intl.
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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 April 29, 2025.

This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/279:35 amKEF - SEA
1 stop10h 23mMultiple Airlines
Tue 6/33:20 pmSEA - KEF
2 stops30h 30mMultiple Airlines
Deal found 4/29$543
This Cheapflightsfares deal was found by Cheapflights users on 4/29. 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.
Thu 7/109:35 amKEF - SEA
1 stop16h 03mWestJet
Sun 7/137:05 amSEA - KEF
1 stop18h 10mWestJet
Deal found 4/29$580
This Scandinavian Airlines deal was found by Cheapflights users on 4/27. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/15:35 pmKEF - SEA
1 stop27h 15mScandinavian Airlines
Fri 6/134:00 pmSEA - KEF
1 stop17h 20mScandinavian Airlines
Deal found 4/27$598
This Ticket deal was found by Cheapflights users on 4/28. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/134:50 pmKEF - SEA
Nonstop8h 00mIcelandair
Sun 6/2211:30 pmSEA - KEF
Nonstop7h 30mIcelandair
Deal found 4/28$621
This Delta deal was found by Cheapflights users on 4/28. 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.
Fri 10/1011:25 amKEF - SEA
1 stop30h 31mDelta
Fri 10/1711:05 pmSEA - KEF
1 stop24h 15mDelta
Deal found 4/28$809
This Ticket deal was found by Cheapflights users on 4/28. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/139:30 amKEF - SEA
2 stops14h 17mKLM
Sun 6/229:50 amSEA - KEF
1 stop13h 30mKLM
Deal found 4/28$820
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Sun 6/19:30 amKEF - SEA
1 stop17h 07mUnited Airlines
Fri 6/137:59 pmSEA - KEF
2 stops29h 11mUnited Airlines
Deal found 4/27$837
This Gotogate deal was found by Cheapflights users on 4/29. 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.
Mon 5/2612:25 amKEF - SEA
1 stop19h 00mLufthansa
Tue 6/32:15 pmSEA - KEF
1 stop26h 20mLufthansa
Deal found 4/29$872
This British Airways deal was found by Cheapflights users on 4/28. 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.
Sat 10/1110:00 amKEF - SEA
1 stop32h 30mBritish Airways
Fri 10/173:13 pmSEA - KEF
2 stops59h 32mBritish Airways
Deal found 4/28$1,002
This Finnair deal was found by Cheapflights users on 4/28. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/128:45 amKEF - SEA
2 stops21h 24mFinnair
Thu 5/155:40 pmSEA - KEF
1 stop15h 50mFinnair
Deal found 4/28$1,154
This Austrian Airlines deal was found by Cheapflights users on 4/28. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1112:10 amKEF - SEA
2 stops27h 08mAustrian Airlines
Thu 5/158:10 amSEA - KEF
2 stops32h 10mAustrian Airlines
Deal found 4/28$1,202
This Turkish Airlines deal was found by Cheapflights users on 4/28. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/912:25 amKEF - SEA
2 stops23h 50mTurkish Airlines
Sun 7/137:10 pmSEA - KEF
2 stops36h 40mTurkish Airlines
Deal found 4/28$1,332

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 April 29, 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

Tue 5/27

9:35 am-12:58 pm

1 stop10h 23m

Seattle/Tacoma Intl

Tue 6/3

3:20 pm-4:50 am

2 stops30h 30m

$543

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 7/10

9:35 am-6:38 pm

1 stop16h 03m

Seattle/Tacoma Intl

Sun 7/13

7:05 am-8:15 am

1 stop18h 10m

$580

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 6/13

7:45 pm-8:40 pm

Nonstop7h 55m

Seattle/Tacoma Intl

Sun 6/22

11:30 pm-2:00 pm

Nonstop7h 30m

$649

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 9/18

5:10 pm-2:00 pm

1 stop27h 50m

Seattle/Tacoma Intl

Mon 9/29

12:00 pm-11:50 pm

2 stops28h 50m

$674

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 6/13

8:50 am-8:48 pm

1 stop18h 58m

Seattle/Tacoma Intl

Sun 6/22

9:50 am-6:20 am

1 stop13h 30m

$829

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Tue 5/27

12:00 pm-9:08 pm

2 stops16h 08m

Seattle/Tacoma Intl

Tue 6/3

7:20 am-8:30 am

3 stops18h 10m

$842

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Mon 5/26

12:25 am-12:25 pm

1 stop19h 00m

Seattle/Tacoma Intl

Tue 6/3

2:15 pm-11:35 pm

1 stop26h 20m

$872

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 6/13

9:30 am-9:38 pm

2 stops19h 08m

Seattle/Tacoma Intl

Sun 6/22

9:33 am-6:20 am

2 stops13h 47m

$885

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 6/12

12:10 am-8:41 pm

2 stops27h 31m

Seattle/Tacoma Intl

Fri 6/20

8:00 am-11:20 pm

2 stops32h 20m

$1,262

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Wed 7/9

12:25 am-5:15 pm

2 stops23h 50m

Seattle/Tacoma Intl

Sun 7/13

7:10 pm-5:20 pm

2 stops39h 10m

$1,417

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 21 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 April.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Reykjavik Keflavik Intl Airport-Seattle flight deals on Cheapflights vs. AranGrant >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 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 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 April 29, 2025.

When flying from Reykjavik Keflavik Intl Airport to Seattle, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 30% versus a flight in the morning.

Weekly flight availability from Reykjavik Keflavik Intl Airport to Seattle

Explore weekly flight availability from Keflavik Intl to Seattle. 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 29, 2025.

The most flights from KEF to SEA are scheduled on a Tuesday (4 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Seattle by month

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

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

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

If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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 April 29, 2025.
Delta
8.0
Very good
7,929 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,275 reviews
Delta
8.0
Very good
7,929 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.6
Good
780 reviews
Delta
8.0
Very good
7,929 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,588 reviews
Delta
8.0
Very good
7,929 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very good
7,929 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 2 inbound flights from Reykjavik Keflavik Intl per day.

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

    Flying on WestJet is currently your cheapest option to Seattle, with prices starting at $580. Additional round-trip tickets that might be worth considering are offered by Icelandair and Scandinavian Airlines, with the lowest prices starting at $649 and $674, respectively. You may be able to fly from Reykjavik Keflavik Intl Airport to Seattle for 27% less than the average price by searching for these airlines.

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

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as $285. Users have also found prices from $486 and $697 on Icelandair and British Airways, respectively.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Reykjavik Keflavik Intl Airport to Seattle on time: Alaska Airlines (95%), Icelandair (95%), airBaltic (89%).

  • 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 $1,016, our data shows the cheapest flight currently is $455. When looking at the most popular route, (Reykjavik Keflavik Intl - Seattle/Tacoma Intl), you can expect to pay $621 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.

  • What is the cheapest month to book a flight from Reykjavik Keflavik Intl Airport to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Reykjavik Keflavik Intl Airport to Seattle (average of $238). Flying from Reykjavik Keflavik Intl Airport to Seattle in July is currently the most expensive (average of $405). 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
SeaTac
Tukwila
Tacoma
Lakewood
Renton
Ocean Shores
Lacey
Leavenworth
Federal Way
Olympia
Shoreline
Cle Elum
Centralia
Kent
Lynnwood
Aberdeen
Shelton
Silverdale
Redmond
Issaquah

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Alternative routes for Keflavik Intl to Seattle

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

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 April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$592Average$759FlexibilityNo cancel feeOn-time76%

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