All Aboard the SEA Underground

SEA trains have always had the ability to get you across the terminal in a snap and help you access the N and S Concourses, and now the airport’s train system has a new name. Allow us to reintroduce the airport’s train system as the SEA Underground! Hop on board and mind the gap with these tips and tricks. Next stop: SEA Underground! Learn what you can find at each SEA Underground stations.