On 4 September 1945 "Blueback" arrived at Apra Harbor, Guam, where she remained until 28 November, conducting daily underway training exercises. After a voyage to the Caroline Islands and the Admiralty Islands, she returned to Guam on 15 December. She stood out for San Diego, California, on 12 January 1946. Remaining on the west coast until 26 August 1946, she then departed for a tour of the Far East. She visited Pearl Harbor, Truk, Subic Bay, Tsingtao and Shanghai, China, before returning to San Diego on 29 November. "Blueback" conducted one more cruise to Pearl Harbor from 17 February to 4 April 1947 and then carried out local operations and type training along the coast of California until March 1948.