What is the cheapest way to get from the Greyhound station in Seattle to SeaTac airport?

Hey. I have a flight Seattle, on Saturday, and I take the Greyhound from Vancouver to Seattle to get there. Greyhound bus but leaves us in the bus station. How far is the airport there? Is there a bus or you can take the bus at the airport, and if so, how much does it cost?

Walk through the center Convention on the bus and go down the tunnel. (It's only a couple of blocks). Whether the MT 194 or bus 174 mt. The fare is $ 1.50. It is about 15 kilometers the airport.

Can you hear Seattle sing? – Vancouver Southsiders bus trip