There are from SEA to Seattle.
Faretrotter is a travel aggregation resource that gathers travel company amenities and statistics and compares modes of transportation between cities. Use Faretrotter to plan your next trip, or purchase a ticket your next city.
There are 2 ways to travel from SEA to Seattle. 1 train and 4 ferries are possible between the two areas. The ferry from Southworth to Fauntleroy West Seattle is the cheapest and fastest.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!