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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 343

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 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
20 Apr — 27 Apr1
1 adult

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 15 April 2025.

Round-trip from

C$ 750

One-way from

C$ 343

Popular in

December

Cheapest in

May

Average price

C$ 982

Good round-trip deal

C$ 700 or less

Good one-way deal

C$ 374 or less
WestJet
  • WestJet
  • 9/7-17/7
  • 2 total stops
  • 29h 18m total
  • Seattle to Reykjavik
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WestJet
  • WestJet
  • 26/8
  • 1 total stop
  • 11h 10m total
  • Seattle to Reykjavik
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Highest demand for flights based on searches. 3% potential increase in price (C$ 47 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 17 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 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 15 April 2025.

Wed 9/71:50 p.m.SEA - KEF
1 stop11h 25mWestJet
Thu 17/79:35 a.m.KEF - SEA
1 stop17h 53mWestJet
Deal found 15/4C$ 750
Fri 2/53:49 p.m.SEA - KEF
1 stop29h 56mMultiple Airlines
Tue 6/53:45 p.m.KEF - SEA
1 stop25h 28mMultiple Airlines
Deal found 15/4C$ 752
Fri 29/87:00 p.m.SEA - KEF
Nonstop7h 25mIcelandair
Tue 2/910:30 a.m.KEF - SEA
Nonstop7h 55mIcelandair
Deal found 15/4C$ 765
Sun 14/96:00 a.m.SEA - KEF
1 stop17h 20mDelta
Wed 1/108:50 a.m.KEF - SEA
1 stop20h 35mDelta
Deal found 15/4C$ 782
Mon 12/55:50 p.m.SEA - KEF
2 stops29h 30mKLM
Fri 23/59:30 a.m.KEF - SEA
1 stop17h 49mKLM
Deal found 15/4C$ 786
Tue 6/59:55 a.m.SEA - KEF
2 stops16h 35mAir France
Sat 17/511:25 a.m.KEF - SEA
2 stops17h 58mAir France
Deal found 14/4C$ 793
Thu 14/86:45 a.m.SEA - KEF
2 stops18h 45mUnited Airlines
Tue 26/812:00 p.m.KEF - SEA
2 stops32h 30mUnited Airlines
Deal found 15/4C$ 869
Mon 1/126:50 p.m.SEA - KEF
1 stop32h 00mBritish Airways
Tue 9/1211:45 a.m.KEF - SEA
1 stop37h 10mBritish Airways
Deal found 15/4C$ 933
Tue 13/52:15 p.m.SEA - KEF
2 stops35h 05mLufthansa
Mon 19/512:25 a.m.KEF - SEA
1 stop19h 00mLufthansa
Deal found 14/4C$ 971
Tue 2/91:45 p.m.SEA - KEF
2 stops35h 35mSWISS
Tue 9/99:25 a.m.KEF - SEA
2 stops40h 11mSWISS
Deal found 14/4C$ 976

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 629,999 searches. Data last updated 15 April 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

Wed 9/7

1:50 p.m.-8:15 a.m.

1 stop11h 25m

Reykjavik Keflavik Intl

Thu 17/7

9:35 a.m.-8:28 p.m.

1 stop17h 53m

C$ 750

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 2/5

3:49 p.m.-4:45 a.m.

1 stop29h 56m

Reykjavik Keflavik Intl

Tue 6/5

3:45 p.m.-10:13 a.m.

1 stop25h 28m

C$ 752

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 29/8

11:30 p.m.-2:00 p.m.

Nonstop7h 30m

Reykjavik Keflavik Intl

Fri 5/9

10:30 a.m.-11:25 a.m.

Nonstop7h 55m

C$ 765

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 14/9

6:00 a.m.-6:20 a.m.

1 stop17h 20m

Reykjavik Keflavik Intl

Wed 1/10

8:50 a.m.-10:25 p.m.

1 stop20h 35m

C$ 782

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 12/5

5:50 p.m.-6:20 a.m.

2 stops29h 30m

Reykjavik Keflavik Intl

Fri 23/5

9:30 a.m.-8:19 p.m.

1 stop17h 49m

C$ 786

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 6/5

11:24 a.m.-9:30 a.m.

1 stop15h 06m

Reykjavik Keflavik Intl

Sat 17/5

11:25 a.m.-10:23 p.m.

2 stops17h 58m

C$ 793

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 14/8

6:45 a.m.-8:30 a.m.

2 stops18h 45m

Reykjavik Keflavik Intl

Tue 26/8

12:00 p.m.-1:30 p.m.

2 stops32h 30m

C$ 869

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 13/5

2:15 p.m.-8:20 a.m.

2 stops35h 05m

Reykjavik Keflavik Intl

Mon 19/5

12:25 a.m.-12:25 p.m.

1 stop19h 00m

C$ 971

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 2/9

1:45 p.m.-8:20 a.m.

2 stops35h 35m

Reykjavik Keflavik Intl

Tue 16/9

9:25 a.m.-6:36 p.m.

2 stops40h 11m

C$ 976

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 26/8

2:05 p.m.-8:15 a.m.

1 stop11h 10m

C$ 343

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/4

Showing 1-10 of 14 results
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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 11 April 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 16 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, January is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 268). Flying from Seattle to Reykjavik Keflavik Intl Airport in December is currently the most expensive (average of C$ 593). 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 15 April 2025.

It’s typically best to fly out from Seattle to Reykjavik Keflavik Intl Airport in the morning. Doing so could potentially save you 17% on the flight price compared to flying at noon, which is usually more expensive.

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 15 April 2025.

The most flights from SEA to KEF are scheduled on a Monday (4 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 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 40.0 - 80.0 mm per month. January is typically the wettest month, when rainfall can reach 80.0 mm. May is typically the driest time to visit Reykjavik Keflavik Intl Airport when rainfall is around 40.0 mm.

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 11.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

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 15 April 2025.
See what other customers who have flown with Alaska Airlines, Delta and KLM from Seattle to Reykjavik have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Alaska Airlines
8.0
Very good
9,871 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Delta
8.0
Very good
7,918 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
KLM
7.8
Good
1,323 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Air France
7.5
Good
1,435 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
SWISS
7.5
Good
1,578 reviews
Alaska Airlines
8.0
Very good
9,871 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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?

    Seattle/Tacoma Intl (SEA), located 18.4 km from the city centre, is the airport you fly out of when you book flights from Seattle to Reykjavik Keflavik Intl. 0 airlines have flights from Seattle/Tacoma Intl to Reykjavik Keflavik Intl on a regular basis. Booking flights from Seattle/Tacoma Intl to Reykjavik Keflavik Intl should not be difficult; the airport handles an average of 3 outbound flights to Reykjavik Keflavik Intl per day.

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

    According to our current data, WestJet (C$ 750), Icelandair (C$ 765), and Delta (C$ 782) offers the cheapest pricing from Seattle to Reykjavik Keflavik Intl Airport. You may be able to fly from Seattle to Reykjavik Keflavik Intl Airport for 29% 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?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at C$ 343. United Airlines flights start at C$ 634 while deals on SWISS start at C$ 809 one-way.

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

    The top 3 most reliable airlines when flying from Seattle to Reykjavik Keflavik Intl Airport are airBaltic (91%), Alaska Airlines (88%) and Icelandair (88%).

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

    On average you can expect to pay C$ 1,488 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 306 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 870.

  • 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, January is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of C$ 268). Flying from Seattle to Reykjavik Keflavik Intl Airport in December is currently the most expensive (average of C$ 593). 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

Travelling to a place near Seattle?

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Keflavik
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