[4] Flint reported to the 3rd Fleet for duty at Ulithi on 27 December 1944, and six days later, sailed with Task Force 38 (TF 38) for a month-long cruise in support of the invasion of Luzon.

She screened aircraft carriers as they launched strikes on Luzon, Taiwan, and the China coast, and fired protective anti-aircraft cover during a Japanese kamikaze attack on 21 January 1945.

[4] Putting to sea with TF 58 for strikes against Kyūshū in preparation for the invasion of Okinawa, Flint aided in bringing down several airplanes in heavy attacks on the task force from 18 to 22 March.

[4] Flint sortied from Leyte on 1 July to screen the final air attacks on the Japanese home islands and to join the bombardment of the east coast of Honshū until the cessation of hostilities.

[4] The cruiser made a voyage from Japan to Eniwetok, then loaded homeward bound servicemen at Yokosuka on 13 October, bringing them into San Francisco Bay on 28 November.