On 30 June 1926, Cobham took off from the River Medway at Rochester in "G-EBFO" to make an Imperial Airways route survey for a service to Melbourne, arriving on 15 August 1926. He left Melbourne on 29 August 1926, and, after completing in 320 hours flying time over 78 days, he alighted on the Thames at Westminster on 1 October 1926. Cobham was met by the Secretary of State for Air, Sir Samuel Hoare, and was subsequently knighted by HM King George V.