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Keflavik Intl

$241+ 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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Reykjavik Keflavik Intl are usually found in October or August, booked 81 days in advance, depart on a Wednesday or Monday and return on a Monday

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 September 11, 2025.

Round-trip from

$400

One-way from

$241
(Trip.com)

Popular in

December

Cheapest in

October

Average price

$725

Good round-trip deal

$463 or less

Good one-way deal

$413 or less
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. 8% potential increase in price ($71 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This deal was found by Cheapflights users on 9/10. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/22:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Sat 11/85:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/10$400
This FlightHub deal was found by Cheapflights users on 9/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/217:00 pmSEA - KEF
Nonstop7h 25mIcelandair
Thu 9/257:45 pmKEF - SEA
Nonstop7h 55mIcelandair
Deal found 9/10$401
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Wed 10/83:45 pmSEA - KEF
Nonstop7h 30mIcelandair
Wed 10/154:50 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/11$409
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Tue 10/73:45 pmSEA - KEF
Nonstop7h 30mIcelandair
Thu 10/167:45 pmKEF - SEA
Nonstop7h 55mIcelandair
Deal found 9/11$410
This Trip.com deal was found by Cheapflights users on 9/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/257:00 pmSEA - KEF
Nonstop7h 25mIcelandair
Tue 10/77:45 pmKEF - SEA
Nonstop7h 55mIcelandair
Deal found 9/11$412
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/92:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Sun 12/145:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/10$416
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:00 pmSEA - KEF
Nonstop7h 25mIcelandair
Wed 10/17:45 pmKEF - SEA
Nonstop7h 55mIcelandair
Deal found 9/11$425
This Gotogate deal was found by Cheapflights users on 9/11. 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.
Fri 10/313:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Sat 11/85:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/11$428
This Gotogate deal was found by Cheapflights users on 9/11. 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 12/62:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Fri 12/125:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/11$429
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/53:45 pmSEA - KEF
Nonstop7h 30mIcelandair
Wed 10/154:50 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/11$432
This CrystalTravel deal was found by Cheapflights users on 9/11. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/97:00 pmSEA - KEF
Nonstop7h 25mIcelandair
Wed 10/154:50 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/11$434
This oojo deal was found by Cheapflights users on 9/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/303:35 pmSEA - KEF
Nonstop7h 40mIcelandair
Sat 11/85:00 pmKEF - SEA
Nonstop8h 00mIcelandair
Deal found 9/11$436

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 September 11, 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

Mon 10/6

3:45 pm-6:15 am

Nonstop7h 30m

Reykjavik Keflavik Intl

Thu 10/16

7:45 pm-8:40 pm

Nonstop7h 55m

$449

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 9/23

7:45 am-9:30 am

1 stop18h 45m

Reykjavik Keflavik Intl

Thu 10/2

11:25 am-8:16 pm

1 stop15h 51m

$473

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 10/4

3:45 pm-6:20 am

2 stops31h 35m

Reykjavik Keflavik Intl

Mon 10/13

8:45 am-10:03 pm

1 stop20h 18m

$478

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 9/26

9:45 pm-9:30 am

2 stops28h 45m

Reykjavik Keflavik Intl

Thu 10/2

11:25 am-8:16 pm

1 stop15h 51m

$478

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 9/22

11:54 pm-7:00 am

2 stops24h 06m

Reykjavik Keflavik Intl

Tue 9/30

1:15 am-4:59 pm

1 stop22h 44m

$482

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 12/7

2:35 pm-6:15 am

Nonstop7h 40m

Reykjavik Keflavik Intl

Sun 12/14

5:00 pm-5:00 pm

Nonstop8h 00m

$609

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 9/23

11:25 am-9:30 am

1 stop15h 05m

Reykjavik Keflavik Intl

Wed 10/1

11:25 am-10:25 pm

1 stop18h 00m

$613

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 9/22

5:30 am-9:30 am

2 stops21h 00m

Reykjavik Keflavik Intl

Wed 10/1

11:25 am-8:16 pm

1 stop15h 51m

$618

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 9/25

7:15 am-8:10 am

1 stop17h 55m

Reykjavik Keflavik Intl

Fri 10/3

9:30 am-6:45 pm

3 stops40h 15m

$628

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 10/10

5:30 am-8:15 am

3 stops19h 45m

$266

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 20 results
1
2

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 August 29, 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 81 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 $655). 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 September 11, 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 evening tend to be the most expensive. A flight in the morning could potentially save you up to 19% 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.

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 September 11, 2025.
Read through reviews of airlines operating flights from Seattle to Reykjavik Keflavik Intl Airport, such as Icelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Icelandair
7.0
Good
546 reviews

Boarding

7.1

Entertainment

7.0

Comfort

6.9

Food

6.2

Crew

8.0

Overall

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.
Icelandair
7.0
Good
546 reviews
Icelandair
7.0
Good
546 reviews

Boarding

7.1

Entertainment

7.0

Comfort

6.9

Food

6.2

Crew

8.0

Overall

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.

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 5 outbound flights to Reykjavik Keflavik Intl per day from 1 airline. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • How long is the flight from Seattle to Reykjavik Keflavik Intl Airport?

    Airlines like Icelandair and Delta fly from Seattle to Reykjavik Keflavik Intl Airport in about 7h 30m. The time it takes to get you to your destination can typically vary by up to 24h 05m. The distance from Seattle to Reykjavik Keflavik Intl Airport is about 3608 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Seattle to Reykjavik Keflavik Intl Airport round-trip?

    Currently priced at $396, 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. You may be able to fly from Seattle to Reykjavik Keflavik Intl Airport for 45% less than the average price by searching for this airline.

  • What are the cheapest flights from Seattle to Reykjavik Keflavik Intl Airport?

    Looking at all options, your cheapest flight can be booked for $355. While the most popular route (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) can be booked for $383 on average, our data indicates $1,231 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 $655). 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
Keflavik
Hveragerdi

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Top airline flying from Seattle to Keflavik Intl

Discover the top airline 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$396Average$690FlexibilityNo cancel feeOn-time76%

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