SEA - KEF

$235 Find Cheap Flights from Seattle to Reykjavik-Keflavik Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Reykjavik departing on 10/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Reykjavik Keflavik Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Reykjavik, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Reykjavik, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Seattle to Keflavik Intl (SEA-KEF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Keflavik Intl that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Reykjavik

Tue, Sep 16 - Wed, Sep 24
Icelandair Logo
7:00 pm - 9:25 amSEA-KEF
7h 25mnonstop
Icelandair Logo
7:45 pm - 8:40 pmKEF-SEA
7h 55mnonstop
$398Icelandair
Find Deal
Sun, Nov 2 - Fri, Nov 7
Icelandair Logo
2:35 pm - 6:15 amSEA-KEF
7h 40mnonstop
Icelandair Logo
5:00 pm - 5:00 pmKEF-SEA
8h 00mnonstop
$400Icelandair
Find Deal
Sat, Sep 13 - Mon, Sep 22
Air Canada Logo
5:30 am - 8:10 amSEA-KEF
19h 40m2 stops
Air Canada Logo
9:50 am - 10:59 amKEF-SEA
32h 09m1 stop
$451Air Canada
Find Deal
Sat, Sep 13 - Mon, Sep 22
Air Canada Logo
7:15 am - 8:10 amSEA-KEF
17h 55m1 stop
Air Canada Logo
9:50 am - 10:59 amKEF-SEA
32h 09m1 stop
$455Air Canada
Find Deal
Mon, Sep 22 - Tue, Sep 30
 Logo
2:55 pm - 8:10 amSEA-KEF
34h 15m2 stops
 Logo
1:15 am - 4:59 pmKEF-SEA
22h 44m1 stop
Sun, Sep 28 - Tue, Oct 7
Delta Logo
11:20 pm - 9:30 amSEA-KEF
27h 10m2 stops
Delta Logo
8:45 am - 4:54 pmKEF-SEA
15h 09m2 stops
$463Delta
Find Deal
Sun, Oct 5 - Tue, Oct 14
 Logo
10:00 am - 8:15 amSEA-KEF
15h 15m2 stops
 Logo
4:10 pm - 6:36 pmKEF-SEA
33h 26m2 stops
Mon, Sep 15 - Mon, Sep 22
United Airlines Logo
7:10 am - 8:30 amSEA-KEF
18h 20m2 stops
United Airlines Logo
9:50 am - 1:03 pmKEF-SEA
34h 13m2 stops
$469United Airlines
Find Deal
Wed, Sep 3 - Fri, Sep 12
United Airlines Logo
4:55 pm - 8:30 amSEA-KEF
32h 35m1 stop
United Airlines Logo
9:30 am - 8:42 pmKEF-SEA
42h 12m2 stops
$470United Airlines
Find Deal
Sun, Oct 5 - Mon, Oct 13
Delta Logo
6:00 am - 6:20 amSEA-KEF
17h 20m1 stop
Delta Logo
8:45 am - 10:03 pmKEF-SEA
20h 18m1 stop
$473Delta
Find Deal
Booking Insights

KAYAK's insights & trends for Seattle to Reykjavik flights

Get data-powered insights and trends into flights from Seattle to Reykjavik to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Seattle to Reykjavik-Keflavik Airport?

The average price of all round-trip flights from Seattle to Reykjavik Keflavik Intl Airport clicked on KAYAK for each day over the last 12 months.

When flying from Seattle to Reykjavik-Keflavik Airport, you should consider leaving on a Wednesday and avoid Thursdays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Saturdays and the most expensive ones on Sundays.

What is the cheapest month to fly from Seattle to Reykjavik Keflavik Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Reykjavik Keflavik Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Reykjavik Keflavik Intl Airport is October, where tickets cost $547 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $855 and $791 respectively.

Can I save money by flying with a layover from Seattle to Reykjavik Keflavik Intl Airport?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $1,876, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Seattle to Reykjavik Keflavik Intl Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Reykjavik Keflavik Intl Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Reykjavik Keflavik Intl Airport, you should book around 2 weeks before departure, which saves you about 42% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

Good to know

Low seasonNovember
Cheapest flight$235
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Seattle to Reykjavik-Keflavik Airport

When to book flights from Seattle to Reykjavik

Are your dates flexible? Find out the best times to travel from Seattle to Reykjavik based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Seattle to Reykjavik-Keflavik Airport flights

  • What is the cheapest flight from Seattle to Reykjavik Keflavik Intl Airport?

    In the last 3 days, the lowest price for a flight from Seattle to Reykjavik Keflavik Intl Airport was $235 for a one-way ticket and $398 for a round-trip.

  • Do I need a passport to fly between Seattle and Reykjavik-Keflavik Airport?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Seattle and on arrival in Reykjavik-Keflavik Airport.

  • Which airports will I be using when flying from Seattle to Reykjavik-Keflavik Airport?

    When flying out of Seattle you will be using Seattle/Tacoma Intl. You will be landing at Reykjavik-Keflavik Airport, also known as Reykjavik Keflavik Intl.

  • Which airlines offer Wi-Fi service onboard planes from Seattle to Reykjavik-Keflavik Airport?

    All the following airlines offer inflight Wi-Fi service on the Seattle to Reykjavik-Keflavik Airport flight route: Air France, Lufthansa, Delta, United Airlines, Virgin Atlantic, and KLM.

  • Which aircraft models fly most regularly from Seattle to Reykjavik-Keflavik Airport?

    The Airbus A330-900neo is the aircraft model that flies most regularly on the Seattle to Reykjavik-Keflavik Airport flight route.

  • Which airline alliances offer flights from Seattle to Reykjavik-Keflavik Airport?

    oneworld is the only airline alliance operating flights between Seattle and Reykjavik-Keflavik Airport.

  • On which days can I fly direct from Seattle to Reykjavik-Keflavik Airport?

    There are nonstop flights from Seattle to Reykjavik-Keflavik Airport on a daily basis.

  • How does KAYAK find such low prices on flights from Seattle to Reykjavik-Keflavik Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Reykjavik-Keflavik Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Reykjavik-Keflavik Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Reykjavik-Keflavik Airport from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Reykjavik-Keflavik Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Reykjavik-Keflavik Airport with an airline and back to Seattle with another airline. Booking your flights between Seattle and KEF can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Reykjavik-Keflavik Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Reykjavik-Keflavik Airport from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to Reykjavik Keflavik Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $273 or less one-way and $460 or less round-trip.

Prefer to fly direct from Seattle to Reykjavik-Keflavik Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Seattle/Tacoma Intl to Reykjavik Keflavik Intl.
Find which airlines fly direct from Seattle/Tacoma Intl Airport to Reykjavik Keflavik Intl Airport, which days they fly and book direct flights.

Direct departures

Seattle/Tacoma Intl to Reykjavik Keflavik Intl

Monday

Alaska Airlines, Icelandair, airBaltic

Alaska Airlines, Icelandair, +1 more

Tuesday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Wednesday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Thursday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Friday

Alaska Airlines, Icelandair, airBaltic

Alaska Airlines, Icelandair, +1 more

Saturday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Sunday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

See more direct flights

Direct returns

Reykjavik Keflavik Intl to Seattle/Tacoma Intl

Monday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Tuesday

Alaska Airlines, Icelandair, airBaltic

Alaska Airlines, Icelandair, +1 more

Wednesday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Thursday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Friday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

Saturday

Alaska Airlines, Icelandair, airBaltic

Alaska Airlines, Icelandair, +1 more

Sunday

Alaska Airlines, Icelandair

Alaska Airlines, Icelandair

See more direct flights

Reviews of the top airline flying from Seattle to Reykjavik

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Reykjavik. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Reykjavik? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.0
IcelandairOverall score based on 534 reviews
7.0Entertainment
6.2Food
6.9Comfort
7.1Boarding
8.0Crew
Airline reviews

Best smelling onboard bathrooms ever. Even after use the whole flight. Biggest overhead bins. Most legroom in economy class. Great Icelandiic music. Really nice staff. Icelandair is awesome! (Don’t fly Air Canada! During the strike they lied about no flights available (I booked this flight myself) and hid the process to get money back on their website by obscuring menu titles, then made it difficult and time consuming to fill out. I’m Canadian. Don’t trust Air Canada!

10.0 ExcellentGlen, Aug 2025DUB - KEF
Read more Icelandair reviews

Best smelling onboard bathrooms ever. Even after use the whole flight. Biggest overhead bins. Most legroom in economy class. Great Icelandiic music. Really nice staff. Icelandair is awesome! (Don’t fly Air Canada! During the strike they lied about no flights available (I booked this flight myself) and hid the process to get money back on their website by obscuring menu titles, then made it difficult and time consuming to fill out. I’m Canadian. Don’t trust Air Canada!

It was good. The air plane is clean and staff were friendly.

Worst airline I’ve ever flown. Delayed 5.5 hrs, missed connecting flight, and missed an entire day of vacation. Zero customer service

Everything sucked. No food, one small glass of water, a tiny coffee, 5.5 hour delay with no customer service. Would never recommend flying them.

The crew was wonderful at check in, the gate and on board. Felt the luggage had more room than the passengers. The seats were smaller than most domestic U.S. airlines. I'm only 5'2" and I had little legroom. There were only 2 bathrooms in coach. Needed more. The flight was very smooth but not the most comfortable.

There was no lounge at Boston for us to use. Typically flying first class overseas comes with lounge privileges. The seats did not recline even a little. My headset only worked on one side. I felt like I was flying on Ryan Air, not Icelandic Air.

Boarded with no problems. Sat on the tarmac for an hour before taking off. We were the last ones on our connecting flight. Didn't think we were going to make it. Our flight to Iceland was similarly delayed. When we've flown other airlines, pilots have tried to make up time while in the air. This doesn't seem to be something that Icelandair does. We made all of our flights, but it was stressful and we didn't think it was going to happen based on the time we arrived.

The flight was delayed and as a consequence we missed our connecting flight. Were stuck for another 6h in Reykyavik. Appreciated that we got a generous food voucher at least. Would have liked to see more information upon arrival including a person waiting for connecting flight travellers and informing already that we will not catch the flight and directing us to the office dealing with the matter; unfortunately that didnt happen and we hence first needed to find out whether flight had indeed left already and then locate the adequate office to help us with booking us on the next connecting flight. Also my suitcase broke and it is not clear whether it is happened on the leg with Iceland Air from DC to Reykyavik or on the leg with Lufthansa from Reykyavik to Frankfurt. Finally, understood that it is a low cost company but at least provision of earplugs for free would have been nice, instead of making them buy.

Great experience on Icelandair flight from Newark to Amsterdam by way of Reykjavík. Courteous and professional staff. Food was solid. Service - outstanding. Cabin was a little warm.

Good service. No complementary food for international flight. WiFi kinda pricey. Got the job done for the right price.

Everything you need to know for your flight from Seattle to Reykjavik

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