She returned to Kerama Retto on 26 June 1945 and resumed seaplane tending operations there through the cessation of hostilities with Japan on 15 August 1945, which brought World War II to a close.

Suisun arrived at San Francisco, California, on 9 December 1945, then was routed onward to the United States East Coast.

She made training cruises to Trinidad; the Galápagos Islands; Key West, Florida; and San Juan, Puerto Rico.

On 21 July 1947 she deployed to the Far East and operated between Guam, Okinawa, and Tsingtao, China, until returning to San Diego on 19 January 1948.

She operated in Alaskan waters again from 6 July 1949 to 18 August 1949, when she returned to Mare Island Naval Shipyard at Vallejo, California, for an overhaul that lasted into October 1949.

On 26 April 1950, Suisun sailed to Whidbey Island, Washington, where she loaded Patrol Squadron 6 (VP-6) and ferried it to Naval Air Station Barbers Point, Hawaii.

She serviced and fueled seaplanes of Patrol Squadron 46 (VP-46) until 16 July 1950 when the planes flew, and the ship sailed, to the Pescadores Islands to begin operations from there.

From 17 July 1950 to 20 October 1950, Suisun and the squadron were assigned to the United States Seventh Fleet and monitored military activities of the People's Republic of China in case of a Chinese intervention in the Korean War.

With that assignment over, Suisun spent ten days in Hong Kong for a leave and upkeep period, then sailed for the United States on 2 November 1950, via Okinawa and Pearl Harbor.

Suisun conducted two more tours in the Western Pacific after the end of the Korean War, the first from 18 September 1953 to 17 March 1954 and the second from 2 July 1954 to 23 November 1954.