 After his discharge from the Australian Imperial Force, Whittle re-settled in Hobart with his family. He briefly re-enlisted in the 40th Battalion during 1921, before moving to Sydney, New South Wales, where he gained employment as an inspector on the staff of an insurance company. Whittle later worked in several other jobs, including a period of service with Tooth's Brewery in Sydney. On 11 November 1929, he attended the New South Wales Dinner for recipients of the Victoria Cross in Sydney, before briefly re-enlisting in the Australian Army once again the following year.
