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$332+ 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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
jul. 8 — jul. 151
mar. 7/8
mar. 7/15
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 julio 3, 2025.

Round-trip from

$673
(Ticket)

One-way from

$332
(PLAY)

Popular in

December

Cheapest in

September

Average price

$652

Good one-way deal

$555 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 July 2025
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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 julio 3, 2025.

This Ticket deal was found by Cheapflights users on 7/1. 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.
lun. 8/1810:30 amKEF - SEA
Nonstop7h 55mIcelandair
mar. 8/2611:30 pmSEA - KEF
Nonstop7h 30mIcelandair
Deal found 7/1$673
This Scandinavian Airlines deal was found by Cheapflights users on 7/2. 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.
vie. 9/267:40 amKEF - SEA
2 stops21h 45mScandinavian Airlines
vie. 10/174:20 pmSEA - KEF
1 stop17h 00mScandinavian Airlines
Deal found 7/2$758
This Netflights deal was found by Cheapflights users on 7/1. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/184:50 pmKEF - SEA
1 stop13h 31mMultiple Airlines
lun. 9/2911:34 pmSEA - KEF
1 stop23h 31mMultiple Airlines
Deal found 7/1$793
This lol.travel deal was found by Cheapflights users on 7/1. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/159:30 amKEF - SEA
1 stop18h 11mAir Canada
vie. 8/227:20 amSEA - KEF
1 stop18h 00mAir Canada
Deal found 7/1$828

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 julio 3, 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

lun. 8/18

10:30 am-11:25 am

Nonstop7h 55m

Seattle/Tacoma Intl

mar. 8/26

11:30 pm-2:00 pm

Nonstop7h 30m

$673

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

vie. 9/26

7:40 am-10:25 pm

2 stops21h 45m

Seattle/Tacoma Intl

vie. 10/17

4:20 pm-4:20 pm

1 stop17h 00m

$758

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

jue. 9/18

4:50 pm-11:21 pm

1 stop13h 31m

Seattle/Tacoma Intl

lun. 9/29

11:34 pm-6:05 am

1 stop23h 31m

$793

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

vie. 8/15

9:30 am-8:41 pm

1 stop18h 11m

Seattle/Tacoma Intl

vie. 8/22

7:20 am-8:20 am

1 stop18h 00m

$828

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

vie. 9/5

3:05 pm-10:27 pm

1 stop14h 22m

$332

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

mié. 8/20

9:35 am-8:28 pm

1 stop17h 53m

$334

ReykjavikSeattle

KEF - SEA

KEFSEA

Reykjavik Keflavik Intl

sáb. 12/27

5:05 pm-5:00 pm

Nonstop7h 55m

$507

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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 julio 3, 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 julio 3, 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).

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

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 julio 3, 2025.
Read reviews from past customers who have flown Scandinavian Airlines, WestJet, and Air Canada from Reykjavik Keflavik Intl Airport to Seattle. 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.
Scandinavian Airlines
7.3
Good
1,416 reviews

Entertainment

6.6

Overall

7.3

Comfort

7.2

Crew

7.9

Boarding

7.6

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

ATH - CPH

The flight crew of Aegean were very nice. I travelled coach, so comfort and such is based on that. However, their ground crew have a serious scam going. I flew from Athens to Santorini with all carry on baggage, nothing checked. On the return flight to Athens my baggage miraculously was "too big" for the over head compartments and had to pay to check my bags. I even told them I didn't pay coming over. Their answer? "I don't care." They hit everyone going back to Athens like that...that's a serious money maker at a minimum of 40 Euros per bag.
Scandinavian Airlines
7.3
Good
1,416 reviews
Scandinavian Airlines
7.3
Good
1,416 reviews

Entertainment

6.6

Overall

7.3

Comfort

7.2

Crew

7.9

Boarding

7.6

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

ATH - CPH

The flight crew of Aegean were very nice. I travelled coach, so comfort and such is based on that. However, their ground crew have a serious scam going. I flew from Athens to Santorini with all carry on baggage, nothing checked. On the return flight to Athens my baggage miraculously was "too big" for the over head compartments and had to pay to check my bags. I even told them I didn't pay coming over. Their answer? "I don't care." They hit everyone going back to Athens like that...that's a serious money maker at a minimum of 40 Euros per bag.
WestJet
7.2
Good
2,917 reviews
Scandinavian Airlines
7.3
Good
1,416 reviews

Entertainment

6.6

Overall

7.3

Comfort

7.2

Crew

7.9

Boarding

7.6

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

ATH - CPH

The flight crew of Aegean were very nice. I travelled coach, so comfort and such is based on that. However, their ground crew have a serious scam going. I flew from Athens to Santorini with all carry on baggage, nothing checked. On the return flight to Athens my baggage miraculously was "too big" for the over head compartments and had to pay to check my bags. I even told them I didn't pay coming over. Their answer? "I don't care." They hit everyone going back to Athens like that...that's a serious money maker at a minimum of 40 Euros per bag.
Air Canada
7.1
Good
9,678 reviews
Scandinavian Airlines
7.3
Good
1,416 reviews

Entertainment

6.6

Overall

7.3

Comfort

7.2

Crew

7.9

Boarding

7.6

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

ATH - CPH

The flight crew of Aegean were very nice. I travelled coach, so comfort and such is based on that. However, their ground crew have a serious scam going. I flew from Athens to Santorini with all carry on baggage, nothing checked. On the return flight to Athens my baggage miraculously was "too big" for the over head compartments and had to pay to check my bags. I even told them I didn't pay coming over. Their answer? "I don't care." They hit everyone going back to Athens like that...that's a serious money maker at a minimum of 40 Euros per bag.
Icelandair
7.0
Good
514 reviews
Scandinavian Airlines
7.3
Good
1,416 reviews

Entertainment

6.6

Overall

7.3

Comfort

7.2

Crew

7.9

Boarding

7.6

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

ATH - CPH

The flight crew of Aegean were very nice. I travelled coach, so comfort and such is based on that. However, their ground crew have a serious scam going. I flew from Athens to Santorini with all carry on baggage, nothing checked. On the return flight to Athens my baggage miraculously was "too big" for the over head compartments and had to pay to check my bags. I even told them I didn't pay coming over. Their answer? "I don't care." They hit everyone going back to Athens like that...that's a serious money maker at a minimum of 40 Euros per bag.

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 Icelandair is currently your cheapest option to Seattle, with prices starting at $673. Additional round-trip tickets that might be worth considering are offered by Scandinavian Airlines and Air Canada, with the lowest prices starting at $758 and $828, respectively. You may be able to fly from Reykjavik Keflavik Intl Airport to Seattle for 16% less than the average price by searching for these airlines.

  • 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 $1,069, our data shows the cheapest flight currently is $480. When looking at the most popular route, (Reykjavik Keflavik Intl - Seattle/Tacoma Intl), you can expect to pay $673 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 $390). 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
Lynnwood
Renton
Olympia
Shoreline
Puyallup
Cle Elum
Centralia
Kent
Federal Way
Chehalis
Kirkland
Aberdeen
Shelton

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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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$639Average$759FlexibilityNo cancel feeOn-time76%

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