Shuttle Express runs airport shuttles in 10 passenger vans from the hotels and by reservation from your home. For $25 from downtown (not including tip) it's a pretty good value over a cab ride that is now nearing $40 if you don't mind sharing with strangers and spending a little extra time. Generally, Shuttle Express aims to get you to your flight no more than two hours in advance, if you're like me and like to cut it closer, particularly at non-peak hours, this means a lot of time sitting in the airport for no good reason. Coming home from Sea-Tac, you don't make a reservation, but head to the Shuttle Express counter. The wait time can be anywhere from ten minutes to an hour for a shuttle headed in your direction (and, of course, other people may be dropped off ahead of you) further delaying your trip home. I think the better value is to the airport and then catch a cab coming home from the airport given the crapshoot of how long you might be waiting. The drivers are generally courteous and professional.
more