There are multiple bus lines to downtown Seattle, including both Seattle’s Metro
lines, and express service from the East and South by way of Sound Transit. The Sound Express commuter rail also has a stop at the south end of downtown Seattle. Below are links to transit websites.
http://transit.metrokc.gov/tops/bus/area_images/CBDMap_907.pdf
http://www.soundtransit.org/x6223.xml