£338 Cheap Flights from Seattle (SEA) to Reykjavik (KEF)

View £338 flight on Wed, 23 Sept 2026Opens in a new window

Flight 1

Popular airlines from Seattle-Tacoma International Airport (SEA) to Keflavik International Airport (KEF)

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Cheap Flights from Seattle (SEA) to Reykjavik (KEF)

Prices were available within the past 7 days and start at £338 for one-way flights and £362 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Sun, 4 Oct - Sun, 11 Oct
SEA
Seattle
KEF
Reykjavik
£362 Return, found 6 hours ago
£362
Return
found 6 hours ago
Select Icelandair flight, departing Sun, 4 Oct from Seattle to Reykjavik, returning Sun, 11 Oct, priced at £362 found 6 hours ago
Icelandair
Sun, 20 Sept - Sun, 27 Sept
SEA
Seattle
KEF
Reykjavik
£362 Return, found 6 hours ago
£362
Return
found 6 hours ago
Select Icelandair flight, departing Sun, 20 Sept from Seattle to Reykjavik, returning Sun, 27 Sept, priced at £362 found 6 hours ago
Virgin Atlantic
Thu, 24 Sept - Fri, 2 Oct
SEA
Seattle
KEF
Reykjavik
£363 Return, found 1 day ago
£363
Return
found 1 day ago
Select Virgin Atlantic flight, departing Thu, 24 Sept from Seattle to Reykjavik, returning Fri, 2 Oct, priced at £363 found 1 day ago
KLM
Thu, 24 Sept - Fri, 2 Oct
SEA
Seattle
KEF
Reykjavik
£363 Return, found 1 day ago
£363
Return
found 1 day ago
Select KLM flight, departing Thu, 24 Sept from Seattle to Reykjavik, returning Fri, 2 Oct, priced at £363 found 1 day ago
Air France
Mon, 28 Sept - Mon, 5 Oct
SEA
Seattle
KEF
Reykjavik
£363 Return, found 6 hours ago
£363
Return
found 6 hours ago
Select Air France flight, departing Mon, 28 Sept from Seattle to Reykjavik, returning Mon, 5 Oct, priced at £363 found 6 hours ago
Alaska Airlines
Sun, 31 May - Sat, 6 Jun
SEA
Seattle
KEF
Reykjavik
£366 Return, found 4 days ago
£366
Return
found 4 days ago
Select Alaska Airlines flight, departing Sun, 31 May from Seattle to Reykjavik, returning Sat, 6 Jun, priced at £366 found 4 days ago
Icelandair
Mon, 1 Jun - Mon, 8 Jun
SEA
Seattle
KEF
Reykjavik
£368 Return, found 1 day ago
£368
Return
found 1 day ago
Select Icelandair flight, departing Mon, 1 Jun from Seattle to Reykjavik, returning Mon, 8 Jun, priced at £368 found 1 day ago
Icelandair
Sat, 6 Jun - Sat, 13 Jun
SEA
Seattle
KEF
Reykjavik
£369 Return, found 1 day ago
£369
Return
found 1 day ago
Select Icelandair flight, departing Sat, 6 Jun from Seattle to Reykjavik, returning Sat, 13 Jun, priced at £369 found 1 day ago
Icelandair
Thu, 3 Sept - Thu, 10 Sept
SEA
Seattle
KEF
Reykjavik
£372 Return, found 1 day ago
£372
Return
found 1 day ago
Select Icelandair flight, departing Thu, 3 Sept from Seattle to Reykjavik, returning Thu, 10 Sept, priced at £372 found 1 day ago
Virgin Atlantic
Sun, 27 Sept - Sun, 4 Oct
SEA
Seattle
KEF
Reykjavik
£373 Return, found 1 day ago
£373
Return
found 1 day ago
Select Virgin Atlantic flight, departing Sun, 27 Sept from Seattle to Reykjavik, returning Sun, 4 Oct, priced at £373 found 1 day ago

Find the cheapest month to fly from Seattle (SEA) to Reykjavik (KEF)

April is typically the cheapest month to fly

From £313 - £875 per traveller.

Frequently asked questions

What is the cheapest month to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
September is typically the cheapest month to fly from Seattle - Tacoma Intl. (SEA) to Keflavik Intl. (KEF), with average return fares of approximately £485. This is about 27% lower than the average price throughout the year. September sees lower prices because it falls after the peak summer travel season, when demand drops and airlines compete for bookings. July and August are also good months to find deals on this route.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
Enter SEA to KEF and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
To find a cheap flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
The best airline to fly with from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) will differ from traveller to traveller. If you like to fly early, FI offers early morning flights. If price is the most important factor, FI typically offers the lowest fares. DL offers the most daily flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
Based on booking data from the past year, the best time to fly from Seattle - Tacoma Intl. (SEA) to Keflavik Intl. (KEF) for a good balance of price and popularity is typically September or August. You can expect average return flight prices around £485 during these months. These times are often popular because the weather in Iceland is still pleasant, and you might find fewer crowds than in peak summer, offering a great travel experience.*Prices based on flights available on Expedia in the last year.
How many flights per day from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
There are approximately 3 nonstop flights per day from Seattle - Tacoma Intl. (SEA) to Keflavik Intl. (KEF). For even more choice, look at flights that include layovers, as there are around 68 connecting flights per day. Some common connection points include O'Hare Intl. (ORD), Vancouver Intl. (YVR), and Denver Intl. (DEN).
What is the earliest flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
The earliest flight from Seattle - Tacoma Intl. (SEA) to Keflavik Intl. (KEF) typically departs at approximately 12:20 AM local time, operated by United Airlines and Air Canada. This is a seasonal service active in August. An early departure like this can help maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
You'll typically find the most flights from Seattle - Tacoma Intl. (SEA) to Keflavik Intl. (KEF) on a Friday, with around 49 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Delta Air Lines, United Airlines, and Alaska Airlines. Flight schedules are consistent throughout the week.
What are the most popular departure times for flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
The most popular departure times for flights from Seattle - Tacoma Intl. (SEA) to Keflavik Intl. (KEF) are in the evening, from 6pm to 9pm. This accounts for around 23% of total traffic. Many major carriers, including Icelandair, Alaska Airlines and British Airways, offer flights during this window. Many travelers prefer these times because they allow you to finish your day in Seattle before heading to the airport, and you'll arrive in Reykjavik ready to start your day.
How long does it take to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
Flying nonstop from SEA to KEF takes around 7 hours 30 minutes, with the route covering approximately 3,610 miles. Flights with a layover typically take 7 hours 30 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
Select the "Business class" and "First class" filters when looking for SEA to KEF flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) flight with Expedia?
It's easy to earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Reykjavik from Seattle - Tacoma Intl. (SEA)?
From Seattle - Tacoma Intl. (SEA), you can fly into Keflavik Intl. (KEF) to reach Reykjavik. Some flights may connect through major hubs like O'Hare Intl. (ORD), Denver Intl. (DEN), San Francisco Intl. (SFO) before reaching Reykjavik. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) at the last minute?
Typically, booking a last minute flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) flight and hotel package?
Securing a Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.)?
If you booked your Seattle, WA (SEA-Seattle - Tacoma Intl.) to Reykjavik (KEF-Keflavik Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Keflavik Intl.
Airlines serving
Air Canada, Air France, Alaska Airlines, British Airways, Brussels Airlines, Finnair, Icelandair, KLM, Lufthansa, Scandinavian Airlines, Virgin Atlantic, WestJet
Return price
£361
Distance
5776 km
Average flight time
14 hours 30 mins

Book with confidence

Compare flights from Seattle to Reykjavik easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Seattle to Reykjavik. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Keflavik Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Seattle - Tacoma Intl. to Keflavik Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Seattle - Tacoma Intl. (SEA) to Keflavik Intl. (KEF)

The easiest way to view the best deals on flights from Seattle to Reykjavik today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Seattle - Tacoma Intl. to Keflavik Intl. start at just £362 and range up to £386.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Seattle and Reykjavik
  • booking your flight during October, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Seattle to Reykjavik flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Seattle - Tacoma Intl. to Keflavik Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Seattle to Reykjavik easily and book with confidence

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*Available to Expedia members.