"Themistocles" left Liverpool on 22 May and joined Convoy ON 304, which took her across the North Atlantic. She called at Hampton Roads on 5 June, passed through the Panama Canal, and reached Auckland on 9 July. She began her return voyage from Auckland on 8 August and was crossing the South Pacific when Japan surrendered on 15 August. She passed through the Panama Canal, called at Kingston on 2 September and reached Liverpool on 21 September.