After the Armistice with Germany was signed on 11 November 1918, bringing World War I to an end, Julia Luckenbach was transferred to the Cruiser and Transport Force. In her new postwar role as a troop transport, she continued to transport cargo to France while returning to the United States with troops, patients, and other military personnel coming home after the war.
Julia Luckenbach arrived in New York at the end of her final cruise in U.S. Navy service in July 1919 and remained there until she decommissioned on 9 September 1919. She was returned to Luckenbach Steamship Company the same day.
Once again SS Julia Luckenbach, she resumed commercial service as a cargo ship, continuing in this role until September 1943 when, during World War II, she was badly damaged and declared a "constructive total loss."