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Cheap flights from Seattle to Reykjavik Keflavik Intl Airport from C$ 431

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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
17 Jun — 24 Jun1
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 12 June 2025.

Round-trip from

C$ 576

One-way from

C$ 431

Popular in

December

Cheapest in

October

Average price

C$ 1,013

Good round-trip deal

C$ 681 or less

Good one-way deal

C$ 365 or less
United Airlines
  • United Airlines
  • 3/8-12/8
  • 2 total stops
  • 50h 40m total
  • Seattle to Reykjavik
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5/9
  • 5/9
  • 1 total stop
  • 22h 11m total
  • Seattle to Reykjavik
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Highest demand for flights based on searches. 7% potential increase in price (C$ 105 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 22 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 12 June 2025.

Sun 3/87:00 a.m.SEA - KEF
1 stop18h 30mUnited Airlines
Tue 12/89:50 a.m.KEF - SEA
1 stop32h 10mUnited Airlines
Deal found 10/6C$ 576
Fri 3/1011:35 p.m.SEA - KEF
2 stops50h 55mDelta
Mon 13/108:45 a.m.KEF - SEA
2 stops33h 11mDelta
Deal found 12/6C$ 634
Wed 1/104:20 p.m.SEA - KEF
2 stops31h 45mScandinavian Airlines
Sat 11/105:10 p.m.KEF - SEA
1 stop27h 50mScandinavian Airlines
Deal found 12/6C$ 655
Wed 11/66:50 p.m.SEA - KEF
1 stop22h 20mLufthansa
Sat 14/61:15 a.m.KEF - SEA
2 stops18h 10mLufthansa
Deal found 10/6C$ 663
Mon 7/711:30 p.m.SEA - KEF
Nonstop7h 30mIcelandair
Tue 22/710:30 a.m.KEF - SEA
Nonstop7h 55mIcelandair
Deal found 12/6C$ 697
Tue 23/97:20 a.m.SEA - KEF
1 stop19h 10mMultiple Airlines
Thu 2/1011:25 a.m.KEF - SEA
1 stop15h 04mMultiple Airlines
Deal found 11/6C$ 701
Sun 7/911:25 a.m.SEA - KEF
1 stop15h 05mKLM
Fri 12/98:45 a.m.KEF - SEA
2 stops20h 31mKLM
Deal found 10/6C$ 778
Wed 1/101:50 p.m.SEA - KEF
1 stop11h 25mWestJet
Mon 13/109:35 a.m.KEF - SEA
1 stop17h 54mWestJet
Deal found 12/6C$ 782

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 12 June 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 3/8

7:00 a.m.-8:30 a.m.

1 stop18h 30m

Reykjavik Keflavik Intl

Tue 12/8

9:50 a.m.-11:00 a.m.

1 stop32h 10m

C$ 576

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 3/10

11:35 p.m.-9:30 a.m.

2 stops50h 55m

Reykjavik Keflavik Intl

Mon 13/10

8:45 a.m.-10:56 a.m.

2 stops33h 11m

C$ 634

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 1/10

4:20 p.m.-7:05 a.m.

2 stops31h 45m

Reykjavik Keflavik Intl

Sat 11/10

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

1 stop27h 50m

C$ 655

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 7/7

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

Nonstop7h 30m

Reykjavik Keflavik Intl

Tue 22/7

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

Nonstop7h 55m

C$ 697

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Tue 23/9

7:20 a.m.-9:30 a.m.

1 stop19h 10m

Reykjavik Keflavik Intl

Thu 2/10

11:25 a.m.-7:29 p.m.

1 stop15h 04m

C$ 701

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Sun 7/9

11:25 a.m.-9:30 a.m.

1 stop15h 05m

Reykjavik Keflavik Intl

Fri 12/9

8:45 a.m.-10:16 p.m.

2 stops20h 31m

C$ 778

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Wed 1/10

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

1 stop11h 25m

Reykjavik Keflavik Intl

Mon 13/10

9:35 a.m.-8:29 p.m.

1 stop17h 54m

C$ 782

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 31/10

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

2 stops33h 35m

Reykjavik Keflavik Intl

Thu 6/11

3:10 p.m.-1:20 p.m.

1 stop30h 10m

C$ 838

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Fri 5/9

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

1 stop22h 11m

C$ 431

SeattleReykjavik

SEA - KEF

SEAKEF

Seattle/Tacoma Intl

Mon 14/7

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

1 stop29h 40m

C$ 444

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/6

Showing 1-10 of 15 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 9 June 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, 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 12 June 2025.

It’s typically best to fly out from Seattle to Reykjavik Keflavik Intl Airport in the morning. Doing so could potentially save you 16% 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 12 June 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 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 12 June 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
10,000 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
Check prices

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
Check prices

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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
Check prices

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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.
Scandinavian Airlines
7.3
Good
1,387 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

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?

    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 5 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, United Airlines (C$ 576), Delta (C$ 634), and Scandinavian Airlines (C$ 655) 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 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?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at C$ 444. United Airlines flights start at C$ 541 while deals on Lufthansa start at C$ 697 one-way.

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

    On average you can expect to pay C$ 1,469 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$ 580.

  • 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
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