The auxiliary schooner was placed in service on 19 February 1942, assigned to the 11th Naval District, and homeported at San Pedro, California. On 23 July, Seaward was assigned to the Western Sea Frontier.
Seaward ended the year at Mare Island Navy Yard. She was placed out of service on 1 April 1943, and was struck from the Navy List on 18 July 1944.