"Kingfish" was underway for her third war patrol 16 February. On the sub's passage to Formosa, she sank a trawler off the Bonin Islands and torpedoed a passenger freighter. Damage to this ship could not be ascertained as the submarine was immediately attacked by enemy bombs and depth charges. On 17 March, a freighter was tracked and a precise torpedo spread damaged it considerably. Two days later "Kingfish" sighted, tracked, and sank a troop transport as enemy troops scrambled down her sides.