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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 342

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 7/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
4 May — 11 May1
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 29 April 2025.

Round-trip from

C$ 746

One-way from

C$ 342

Popular in

December

Cheapest in

May

Average price

C$ 963

Good round-trip deal

C$ 739 or less

Good one-way deal

C$ 425 or less
Icelandair
  • Icelandair
  • 28/9-6/10
  • Nonstop
  • 15h 25m total
  • Seattle to Reykjavik
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WestJet
  • WestJet
  • 7/7
  • 1 total stop
  • 29h 40m total
  • Seattle to Reykjavik
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Highest demand for flights based on searches. 2% potential increase in price (C$ 43 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease (C$ 14 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 29 April 2025.

Sun 28/93:45 p.m.SEA - KEF
Nonstop7h 30mIcelandair
Mon 6/107:45 p.m.KEF - SEA
Nonstop7h 55mIcelandair
Deal found 28/4C$ 746
Mon 14/77:35 p.m.SEA - KEF
1 stop29h 40mWestJet
Fri 25/79:35 a.m.KEF - SEA
1 stop17h 53mWestJet
Deal found 28/4C$ 747
Sun 14/96:00 a.m.SEA - KEF
1 stop17h 20mDelta
Wed 1/108:45 a.m.KEF - SEA
1 stop18h 45mDelta
Deal found 28/4C$ 776
Tue 3/69:50 a.m.SEA - KEF
1 stop13h 30mKLM
Tue 10/69:30 a.m.KEF - SEA
2 stops21h 34mKLM
Deal found 28/4C$ 787
Thu 18/911:15 a.m.SEA - KEF
1 stop15h 15mMultiple Airlines
Tue 30/911:25 a.m.KEF - SEA
1 stop15h 04mMultiple Airlines
Deal found 27/4C$ 795
Sat 16/811:20 p.m.SEA - KEF
2 stops24h 40mUnited Airlines
Sun 24/89:30 a.m.KEF - SEA
2 stops39h 27mUnited Airlines
Deal found 28/4C$ 834
Wed 29/107:50 p.m.SEA - KEF
1 stop32h 05mBritish Airways
Tue 4/1111:45 a.m.KEF - SEA
1 stop37h 10mBritish Airways
Deal found 28/4C$ 931
Thu 23/107:00 a.m.SEA - KEF
2 stops33h 35mLufthansa
Sat 1/1112:30 a.m.KEF - SEA
1 stop20h 50mLufthansa
Deal found 27/4C$ 965
Sat 6/94:00 p.m.SEA - KEF
1 stop17h 20mScandinavian Airlines
Thu 11/95:10 p.m.KEF - SEA
1 stop27h 50mScandinavian Airlines
Deal found 28/4C$ 1,075

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 29 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

Sun 28/9

3:45 p.m.-6:15 a.m.

Nonstop7h 30m

Reykjavik Keflavik Intl

Mon 6/10

7:45 p.m.-8:40 p.m.

Nonstop7h 55m

C$ 746

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 14/7

7:35 p.m.-8:15 a.m.

1 stop29h 40m

Reykjavik Keflavik Intl

Fri 25/7

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

1 stop17h 53m

C$ 747

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

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

1 stop18h 45m

C$ 776

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 3/6

7:15 a.m.-9:30 a.m.

1 stop19h 15m

Reykjavik Keflavik Intl

Tue 10/6

9:30 a.m.-12:04 a.m.

2 stops21h 34m

C$ 787

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 16/8

11:20 p.m.-7:00 a.m.

2 stops24h 40m

Reykjavik Keflavik Intl

Sun 24/8

9:30 a.m.-5:57 p.m.

2 stops39h 27m

C$ 834

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 24/5

8:35 a.m.-7:00 a.m.

1 stop15h 25m

Reykjavik Keflavik Intl

Tue 17/6

9:30 a.m.-12:04 a.m.

2 stops21h 34m

C$ 872

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Thu 23/10

7:00 a.m.-11:35 p.m.

2 stops33h 35m

Reykjavik Keflavik Intl

Sat 1/11

12:30 a.m.-2:20 p.m.

1 stop20h 50m

C$ 965

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sat 6/9

4:00 p.m.-4:20 p.m.

1 stop17h 20m

Reykjavik Keflavik Intl

Thu 11/9

5:10 p.m.-2:00 p.m.

1 stop27h 50m

C$ 1,075

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 7/7

7:35 p.m.-8:15 a.m.

1 stop29h 40m

C$ 342

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 16/9

11:34 p.m.-4:45 a.m.

1 stop22h 11m

C$ 468

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/4

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 25 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 29 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 29 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 (3 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 29 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
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

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
9,949 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

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
7,929 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

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
1,333 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Scandinavian Airlines
7.3
Good
1,349 reviews
Alaska Airlines
8.0
Very good
9,949 reviews
Check prices

Boarding

8.2

Comfort

7.9

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

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, Icelandair (C$ 746), WestJet (C$ 747), and Delta (C$ 776) 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$ 342. Delta flights start at C$ 632 while deals on United Airlines start at C$ 639 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 (100%), Alaska Airlines (85%) and Icelandair (85%).

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

    On average you can expect to pay C$ 1,494 for a flight from Seattle to Reykjavik Keflavik Intl Airport. The cheapest flight overall is C$ 324 while the most popular route, (Seattle/Tacoma Intl - Reykjavik Keflavik Intl) is currently priced at C$ 783.

  • 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?

Book flights to Seattle if you plan to visit one of these locations
Keflavik
Grindavik

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