You can travel from SeaTac Airport to Seattle Clipper terminal the following ways:

• Sound Transit Light Rail: Approximately $2.75 each way for airport to Westlake Station in downtown Seattle. You would require about a 5-minute taxi to get to the Victoria Clipper terminal at Pier 69. No reservations are required.
• Taxi/Rideshare: Taxis and rideshare services are available on the 3rd floor of the Seattle Airport Parking Garage.