Which ferry do I depart from Seattle to San Juan Island?

To travel from Seattle to San Juan Island, you would typically take the Washington state Ferries service. The most common route departs from Anacortes, so you would first need to drive or take public transport from Seattle to Anacortes. From there, you can catch a ferry to Friday Harbor on San Juan Island. Be sure to check the schedule and make reservations if possible, especially during peak seasons.