"Riddle" continued screening operations in the Marshall-Marianas area until 1 September when she anchored at Manus Island. On 4 October she got underway as part of an escort group to screen the sortie of task unit TU 38.8.16, a carrier and fueling group, from Seeadler Harbor for the Philippine Islands invasion. "Riddle" returned to Manus after the task unit was on its way, and operated in the Admiralty and western Caroline area until early January 1945. On 14 January 1945 she arrived at Leyte Gulf, Philippine Islands, after which she returned to the Marianas and western Carolines on routine screening and patrol duties.