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$287+ 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 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$643
(Scandinavian Airlines)

One-way from

$287
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$819

Good round-trip deal

$659 or less

Good one-way deal

$570 or less
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. 20% potential increase in price ($207 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($47 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Scandinavian Airlines deal was found by Cheapflights users on 6/11. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1810:20 amKEF - SEA
1 stop34h 40mScandinavian Airlines
Mon 9/292:00 pmSEA - KEF
2 stops26h 50mScandinavian Airlines
Deal found 6/11$643
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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.
Fri 9/267:45 pmKEF - SEA
Nonstop7h 55mIcelandair
Fri 10/173:45 pmSEA - KEF
Nonstop7h 30mIcelandair
Deal found 6/10$658
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/269:35 amKEF - SEA
1 stop13h 34mMultiple Airlines
Sat 8/29:15 pmSEA - KEF
1 stop28h 00mMultiple Airlines
Deal found 6/11$664
This Gotogate deal was found by Cheapflights users on 6/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/269:35 amKEF - SEA
2 stops33h 56mWestJet
Sat 8/24:50 pmSEA - KEF
1 stop32h 25mWestJet
Deal found 6/11$746
This Gotogate deal was found by Cheapflights users on 6/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/279:30 amKEF - SEA
2 stops30h 51mAir Canada
Tue 8/57:15 pmSEA - KEF
2 stops29h 55mAir Canada
Deal found 6/10$828
This KLM deal was found by Cheapflights users on 6/12. 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.
Fri 9/268:45 amKEF - SEA
2 stops20h 31mKLM
Fri 10/174:55 pmSEA - KEF
2 stops30h 25mKLM
Deal found 6/12$829
This United Airlines deal was found by Cheapflights users on 6/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/239:30 amKEF - SEA
1 stop18h 11mUnited Airlines
Thu 8/77:00 amSEA - KEF
2 stops18h 10mUnited Airlines
Deal found 6/11$846
This Lufthansa deal was found by Cheapflights users on 6/11. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1712:25 amKEF - SEA
1 stop18h 30mLufthansa
Mon 9/292:20 pmSEA - KEF
1 stop15h 45mLufthansa
Deal found 6/11$937
This Finnair deal was found by Cheapflights users on 6/10. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/105:15 pmKEF - SEA
1 stop29h 45mFinnair
Sat 6/145:40 pmSEA - KEF
1 stop15h 50mFinnair
Deal found 6/10$1,141
This KAYAK deal was found by Cheapflights users on 6/12. 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.
Tue 7/2212:15 amKEF - SEA
2 stops41h 20mTurkish Airlines
Sat 7/2612:30 pmSEA - KEF
2 stops23h 15mTurkish Airlines
Deal found 6/12$1,296

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 June 12, 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

Thu 9/18

10:20 am-2:00 pm

1 stop34h 40m

Seattle/Tacoma Intl

Mon 9/29

2:00 pm-11:50 pm

2 stops26h 50m

$643

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 9/26

7:45 pm-8:40 pm

Nonstop7h 55m

Seattle/Tacoma Intl

Fri 10/17

3:45 pm-6:15 am

Nonstop7h 30m

$658

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 7/26

9:35 am-4:09 pm

1 stop13h 34m

Seattle/Tacoma Intl

Sat 8/2

9:15 pm-8:15 am

1 stop28h 00m

$664

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sat 7/26

9:35 am-12:31 pm

2 stops33h 56m

Seattle/Tacoma Intl

Sat 8/2

4:50 pm-8:15 am

1 stop32h 25m

$746

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Sun 7/27

9:30 am-9:21 am

2 stops30h 51m

Seattle/Tacoma Intl

Tue 8/5

7:15 pm-8:10 am

2 stops29h 55m

$828

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Fri 9/26

8:45 am-10:16 pm

2 stops20h 31m

Seattle/Tacoma Intl

Fri 10/17

4:55 pm-6:20 am

2 stops30h 25m

$829

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Wed 7/23

9:30 am-8:41 pm

1 stop18h 11m

Seattle/Tacoma Intl

Wed 8/6

12:20 am-8:10 am

2 stops24h 50m

$846

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Wed 9/17

12:25 am-11:55 am

1 stop18h 30m

Seattle/Tacoma Intl

Mon 9/29

2:20 pm-1:05 pm

1 stop15h 45m

$937

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Tue 7/22

12:15 am-10:35 am

2 stops41h 20m

Seattle/Tacoma Intl

Sat 7/26

12:30 pm-6:45 pm

2 stops23h 15m

$1,296

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

Thu 7/10

9:35 am-6:38 pm

1 stop16h 03m

$287

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 18 results
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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 June 12, 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 28% 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 June 12, 2025.

The most flights from KEF to SEA are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 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 June 12, 2025.
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Entertainment

7.1

Overall

7.8

Comfort

7.7

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Entertainment

7.1

Overall

7.8

Comfort

7.7

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Finnair
7.6
Good
1,290 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Entertainment

7.1

Overall

7.8

Comfort

7.7

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
SWISS
7.5
Good
1,623 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Entertainment

7.1

Overall

7.8

Comfort

7.7

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
United Airlines
7.4
Good
8,790 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Entertainment

7.1

Overall

7.8

Comfort

7.7

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Turkish Airlines
7.3
Good
3,848 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Entertainment

7.1

Overall

7.8

Comfort

7.7

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

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 6 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 Scandinavian Airlines is currently your cheapest option to Seattle, with prices starting at $643. Additional round-trip tickets that might be worth considering are offered by Icelandair and WestJet, with the lowest prices starting at $658 and $746, respectively. You may be able to fly from Reykjavik Keflavik Intl Airport to Seattle for 20% 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 $287. Users have also found prices from $485 and $786 on Icelandair and Finnair, respectively.

  • 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 $1,359, our data shows the cheapest flight currently is $492. When looking at the most popular route, (Reykjavik Keflavik Intl - Seattle/Tacoma Intl), you can expect to pay $643 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 $391). 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
Ocean Shores
Lacey
Leavenworth
Federal Way
Lynnwood
Olympia
Shoreline
Kent
Cle Elum
Centralia
Kirkland
Aberdeen
Renton
Shelton
Silverdale
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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$639Average$759FlexibilityNo cancel feeOn-time76%

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