Zealandia was used as a troopship during World War I, but between 1919 and 1939 she was employed in the Australian coastal passenger service and trans-Tasman trade, with a crew of some 145 men. Sometimes she travelled to Fremantle and at times was even sent as far as Vancouver.
Albert Halewood Brew served on her as an engineer from 13 October 1934 to 5 February 1935, 6 February to 2 August 1935, 3 August to 6 August 1935, 30 August 1935 to 24 February 1936, and 25 February to 1 May 1936.
Zealandia was also used as a troopship during World War II, but her career was cut short when she was lost to enemy bombing in Japan's first air raid on Darwin on 19 February 1942. She had arrived in Darwin Harbour from Sydney under the command of Captain R. Kerr carrying a cargo of guns, ammunition, and an anti-tank company, and was caught in the open whilst unloading. Three lives were lost, but the remaining 142 men survived the attack, in which two bombs hit her. Sinking to rest on the seabed, only the tops of her masts remained visible.