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In 1950, route 75 worked from Woolwich Ferry by way of Charlton, Blackheath and Lee Green. AEC Regent III RT buses were used. In 1960 the route was extended, on weekdays only, to South Croydon, from West Croydon station. On 26 February 1977, Route 75 was converted to One Man Buses using DMS Buses. Daimler Fleet lines. On 25 July 1983 it converted Leyland Titan (B15) Operation.
In 1991, route 75 was withdrawn between Woolwich and Blackheath and, later in the same year, ceased operating to Blackheath, being diverted to Lewisham station to terminate, additionally there was an extended Saturday shopping hours service to Surrey Quays. The route was also diverted in Sydenham, running to Woolstone Road and Mayow Road instead of the original Bell Green. In 1994 beyond Lewisham was abandoned to make the more or less current route of West Croydon to Lewisham, although, in that year, it was converted to single decker operation. In 1997 double deck operation resumed with Volvo Olympian. In 2002, the route was extended to Fairfield Halls.
In 2000, route 54 was curtailed to Elmers End (due to the new Tramlink) and so route 75 had become quite a busy route. Despite this, the night service of the route was withdrawn on 19 May 2007.
In November 2005 and February 2006, three cases of sexual assault were reported to have occurred on the route.