Seattle’s Hometown Airline, Alaska Airlines, is currently updating many of their facilities at Seattle-Tacoma International Airport, including an entire overhaul of the North Satellite, where many Alaska flights depart from.

Alaska Airlines Boeing 737
Alaska Airlines currently operates two lounges in Seattle:
The North Satellite lounge is the newest and while it isn’t very big, it is much better than Alaska’s ancient lounge in Concourse D. Alaska’s flights depart from Concourse C & D and the North Satellite, which is why Alaska will be opening a brand new lounge in Concourse C this June.
The Alaska Lounge in Concourse C will be located across from gate C9.
Overall, this represents a great addition to Alaska’s lounge network as Alaska flyers will now have a lounge located in every concourse in Seattle that Alaska operates from. Alaska’s lounges can be accessed through a variety of methods including paid First Class travel on Alaska Airlines, a paid lounge membership, etc.

Alaska Airlines Lounge
You can also gain entry to Alaska’s lounges through Priority Pass… but, lately Alaska has been super stingy about accepting Priority Pass cardholders (which I think is really unfair) as they claim the lounges are “overcrowded”. Now, we don’t know for sure if the overcrowding is due to Priority Pass members exclusively or due to other reasons.
Personally I think that if Alaska continues to deny Priority Pass members access to their lounges, the airline should just drop out of the Priority Pass programme. Priority Pass is included with many premium Travel Rewards Credit Cards, such as the American Express Platinum Card. Those with the AMEX Platinum Card already have access to the amazing AMEX Centurion Studio in Seattle, which is miles ahead of any Alaska Airlines Lounge and also The Club at SEA in Concourse A and the South Satellite (through Priority Pass).
In all fairness to the authors point of view with regards to the mentioned Amex Centurian Studio, they only accept AMEX elitists and do not accept other brands of airline signature cards nor paid first class travellers. It is noteworthy to mention that the Alaska Airlines Signature Visa is the quickest way to earn miles rewarding the cardholder with 3 miles per dollar spent on Alaska Airlines and Virgin America flights and the award winning Alaska Airlines Mileage Plan is the easiest program to allow the plan cardholder member to be rewarded with companion fare ticker and only the Alaska Airlines Mileage Plan allows the cardholder and five travelling companions to check 1 free bag per each of the six travelling in the same reservation