Flyus.com searches for the lowest fares from hundreds of airlines to offer you cheap, competitive airfares to your desired destinations, no matter where you're headed. Tell us where you want to go and our interactive Price Tracker tool will point you to the best time to fly to save you time and money!

Good to Know - Flights from Seattle to Keflavik

Low Season:
October
Best time to beat the crowds
High Season:
June
Most popular time to fly
Good Deal:
$ 614.38
or less (round trip)

Cheapest Day of the Month to Book Flights



Top Tips for Finding Cheap Flights from Seattle to Keflavik

Looking for cheap airfare from Seattle to Keflavik? 25% of our users found round-trip tickets to Keflavik for the following price or less: $ 614.38 Book at least 4 weeks before departure in order to get a below-average price. High season is considered to be June. The cheapest month to fly from Seattle to Keflavik is October. Enter your preferred departure airport and travel dates into the search form above to unlock the latest Seattle to Keflavik flight deals.

FAQs - Booking from Seattle to Keflavik flights

How long is the flight from Seattle to Keflavik?
A flight from Seattle to Keflavik takes 1day2hours5minutes.
What is the cheapest flight Seattle to Keflavik?:
The cheapest flight Seattle to Keflavik found on flyus.com in the last 72 hours was $614.38 round-trip.
 
Which airlines fly to Keflavik?:
• Icelandair
• Air Canada
• United Airlines
• Lufthansa
• Alaska Airlines
• American Airlines
 

Find cheap flights from Seattle to Keflavik and book discounted airfare from different cities all over the United States. Explore airline ticket deals on flight routes all over the World! At Flyus, we take pride in helping you discover and book the best flight deals for your next trip at the cheapest price. We make booking flights from different departures easy and provide you with peace of mind with our Best Purchase Guarantee.

Where do you want to fly next?

Cheapest Flights
from Seattle, United States (SEA) to:

  • Keflavik, Iceland (KEF)
    Sep 15, 25 - Sep 23, 25
    $614.38
    Search

  • Keflavik, Iceland (KEF)
    Sep 23, 25 - Oct 07, 25
    $618.75
    Search

  • Keflavik, Iceland (KEF)
    Feb 17, 25 - Feb 26, 25
    $622.81
    Search

  • Keflavik, Iceland (KEF)
    Aug 27, 25 - Sep 24, 25
    $629.85
    Search

  • Keflavik, Iceland (KEF)
    Sep 03, 25 - Sep 10, 25
    $629.85
    Search