Singh joined the Indian Air Force Volunteer Reserve as a pilot officer at the onset of the Second World War, following which he joined the RAF Coastal Command and took command of a Sunderland flying boat during the Battle of the Atlantic. He later became a flying officer with the British Indian Air Force. In 1942, he was with the flying boats that arrived at Broome, Western Australia when a Japanese air attack destroyed them all. Singh survived the attack only to drown in the harbour.