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Keflavik Intl

$257+ 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 May, booked 81 days in advance, depart on a Wednesday 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 June 12, 2025.

Round-trip from

$421
(United Airlines)

One-way from

$257
(Expedia)

Popular in

December

Cheapest in

October

Average price

$741

Good round-trip deal

$499 or less

Good one-way deal

$251 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. 7% potential increase in price ($57 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 June 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 June 12, 2025.

This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/37:00 amSEA - KEF
1 stop18h 30mUnited Airlines
Tue 8/129:50 amKEF - SEA
1 stop32h 10mUnited Airlines
Deal found 6/10$421
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.
Wed 6/1810:00 amSEA - KEF
2 stops15h 10mMultiple Airlines
Mon 6/2312:25 amKEF - SEA
1 stop19h 00mMultiple Airlines
Deal found 6/11$422
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/267:20 amSEA - KEF
2 stops17h 55mAir Canada
Sat 8/29:50 amKEF - SEA
2 stops30h 31mAir Canada
Deal found 6/11$424
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/116:50 pmSEA - KEF
1 stop22h 20mLufthansa
Sat 6/141:15 amKEF - SEA
1 stop22h 44mLufthansa
Deal found 6/10$454
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.
Wed 10/14:20 pmSEA - KEF
1 stop17h 00mScandinavian Airlines
Thu 10/1610:20 amKEF - SEA
1 stop34h 40mScandinavian Airlines
Deal found 6/10$460
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/311:35 pmSEA - KEF
2 stops50h 55mDelta
Mon 10/138:45 amKEF - SEA
2 stops33h 11mDelta
Deal found 6/12$464
This Ticket 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/611:30 pmSEA - KEF
Nonstop7h 30mIcelandair
Tue 7/1510:30 amKEF - SEA
Nonstop7h 55mIcelandair
Deal found 6/10$468
This AirNGo 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/309:45 pmSEA - KEF
1 stop28h 45mVirgin Atlantic
Sun 9/711:25 amKEF - SEA
1 stop15h 49mVirgin Atlantic
Deal found 6/12$496
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/711:25 amSEA - KEF
1 stop15h 05mKLM
Fri 9/128:45 amKEF - SEA
2 stops20h 31mKLM
Deal found 6/10$569
This WestJet 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/11:50 pmSEA - KEF
1 stop11h 25mWestJet
Mon 10/139:35 amKEF - SEA
1 stop17h 54mWestJet
Deal found 6/12$572
This Air France 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/79:50 amSEA - KEF
1 stop13h 30mAir France
Fri 7/118:50 amKEF - SEA
1 stop18h 57mAir France
Deal found 6/10$595

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 June 12, 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

Sun 8/3

7:00 am-8:30 am

1 stop18h 30m

Reykjavik Keflavik Intl

Tue 8/12

9:50 am-11:00 am

1 stop32h 10m

$421

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 7/26

7:20 am-8:15 am

2 stops17h 55m

Reykjavik Keflavik Intl

Sat 8/2

9:50 am-9:21 am

2 stops30h 31m

$424

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 9/14

7:15 am-8:15 am

2 stops18h 00m

Reykjavik Keflavik Intl

Sun 9/21

12:25 am-11:55 am

1 stop18h 30m

$427

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 10/1

4:20 pm-4:20 pm

1 stop17h 00m

Reykjavik Keflavik Intl

Mon 10/6

11:05 am-2:00 pm

2 stops57h 55m

$435

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 10/3

11:35 pm-9:30 am

2 stops50h 55m

Reykjavik Keflavik Intl

Mon 10/13

8:45 am-10:56 am

2 stops33h 11m

$464

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 7/6

11:30 pm-2:00 pm

Nonstop7h 30m

Reykjavik Keflavik Intl

Tue 7/15

10:30 am-11:25 am

Nonstop7h 55m

$468

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 8/30

9:45 pm-9:30 am

1 stop28h 45m

Reykjavik Keflavik Intl

Sun 9/7

11:25 am-8:14 pm

1 stop15h 49m

$496

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 9/7

11:25 am-9:30 am

1 stop15h 05m

Reykjavik Keflavik Intl

Fri 9/12

8:45 am-10:16 pm

2 stops20h 31m

$569

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 10/1

1:50 pm-8:15 am

1 stop11h 25m

Reykjavik Keflavik Intl

Mon 10/13

9:35 am-8:29 pm

1 stop17h 54m

$572

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 7/7

9:50 am-6:20 am

1 stop13h 30m

Reykjavik Keflavik Intl

Fri 7/11

8:50 am-8:47 pm

1 stop18h 57m

$595

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 19 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 June 9, 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 $659). 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 June 12, 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 25% 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. Thursday 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 June 12, 2025.

The most flights from SEA to KEF are scheduled on a Monday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 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 June 12, 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
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
KLM
7.8
Good
1,358 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Air France
7.5
Good
1,463 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.

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 3 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 $421, United Airlines will fly you from Seattle to Reykjavik Keflavik Intl Airport and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and Scandinavian Airlines - these airlines can fly you to your destination from $424 and $460, respectively. You may be able to fly from Seattle to Reykjavik Keflavik Intl Airport for 42% 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 $257. Users have also found prices from $390 and $396 on Air Canada and United Airlines, respectively.

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

    Looking at all options, your cheapest flight can be booked for $195. While the most popular route (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) can be booked for $402 on average our data indicates $1,735 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 $659). 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.

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Top 3 airlines flying from Seattle to Keflavik Intl

Discover the top 3 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$323Average$543FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$449Average$489FlexibilityNo cancel feeOn-time67%
IcelandairCheapest$463Average$730FlexibilityNo cancel feeOn-time76%

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