For the next three months, "William Seiverling" operated with the hunter-killer group from the base at Ulithi. She helped to patrol the sea lanes between various islands in the Central Pacific to keep them clear of Japanese submarines. On 28 December, the destroyer escort departed Ulithi in company with the Tulagi group to provide ASW support for the Lingayen landings scheduled for the beginning of the second week in January 1945. She and her unit stopped at Kossol Roads in the Palau Islands from 29 December 1944 until 1 January 1945.