Seattle-Tacoma International Airport (SEA) is the 17th busiest passenger airport in America with flights across America and plenty more to Asia. Seattle Link light rail travels from SeaTac Airport Station to Westlake Center Station in sownotwn Seattle. Shuttles: In the parking garage, you can catch either of two shuttle bus systems. Shuttle Express goes to any Downtown location for about $23. Airport Express goes to select downtown hotels for $9 each way (800-544-0739).  Both depart SEA every 20 minutes from 4:30a-11:10p. Reservations are not required. Though you are only 11 miles from downtown, trips downtown often take 25-50 minutes.

Taxis are plentiful at Sea-Tac. Unless you are near a downtown hotel, Washington State Convention Center or King Street train station, don't think about hailing a cab from the street. Instead, call Yellow Cab (206-622-6500), Orange Cab (206-522-8800), or Farwest Taxi (206-622-1717). Car Rentals: Alamo, Avis, Budget, Hertz, Dollar, Enterprise and National have pick-up centers in the parking garage connected by covered overhead ramp to the main airport terminal.

King Street Station at 303 Jackson Street is served by Sounder commuter trains and these daily Amtrak trains:

Cascades: Eugene-Portland-Tacoma-Seattle-Vancouver
Coast Starlight: Los Angeles-Santa Barbara-Oakland-Portland-Seattle
Empire Builder: Seattle-Spokane-Fargo-Minneapolis-Milwaukee-Chicago

Cascades is a sleek, European-style trains with wide, comfortable seats; laptop computer outlets; bicycle, ski racks; and regional food and drink. Coast Starlight and Empire Builder operate daily unparalleled "land cruise" travel experiences with fine dining and other amenities.

in 2009 Seattle's Central Link Light Rail Transit line opened to serve this popular route featuring trains every 10 minutes (weekdays, 15 minutes weekends) that begin downtown and extend to Sea-Tac International Airport with these station in between:

Westlake-University Street-Pioneer Square-International District-Stadiums-Beacon Hill-Mount Baker-Columbia City-Othello-Rainier Beach-Tukwila-SeaTac Airport

Central Link is being extended several miles north to University of Washington by 2016. Another line is planned to travel east across Lake Washington to Bellevue, then north to Redmond, where Microsoft is headquartered.

The 81-mile Sounder Commuter Rail Transit line is designed as a long distance commuter service to transport passengers from 4 daily trains to/from Everett and 9 daily trains to/from Tacoma, both to downtown Seattle.

Tacoma Link is a free Light Rail Transit line that provides a great way for tourists to get around downtown Tacoma.

Seattle-Tacoma Freeway System extends a large distance to serve every major community west of Puget Sound. I-5 Freeway from the airport through downtown is one of the nation's most congested, slow-moving commutes. Car pool lanes, metered entrances have been added to help traffic flow in this fast growing region. Major highways of note are:
 
    5  Interstate Freeway connects Seattle to Tacoma
  16  State freeway and highway connects Tacoma to Bremerton
  90  Interstate freeway & bridge connects I-5 with central I-405
  99  State Highway runs north-south on the western side of Seattle
167  State Freeway runs parallel to I-5 from Renton to Puyallup
205  Interstate Freeway connects eastern suburbs to I-5
509  State Freeway connects with 99, but goes to the airport
512  State Freeway connects Lakewood to Puyallup
516  State freeway connect between I-5 and 167
518  State Freeway connects SR 509 with I-5 and I-405
520  State Freeway 7 bridge connects I-5 with northern I-405
405  Interstate Freeway connects suburbs east of Seattle with I-5