Westbus was established in 1955 by the Bosnjak family. The company, known as Bosnjak's Bus Service, operated a fleet of five buses on a route connecting the Sydney suburbs of Canley Vale and Edensor Park. The company grew through a series of acquisitions and, in 1983, was renamed Westbus after the region, Western Sydney, in which it operated.
In 1986, Westbus established a small luxury coach service in the United Kingdom. Westbus established a separate Hillsbus brand in 1996 to run express services from the Hills District to the city, first via the new Anzac Bridge and later via the M2 Hills Motorway.
In 1989, Britain's National Express took a controlling stake in Westbus. Members of the founding Bosnjak family continued to hold stakes. The company continued to grow by acquisition.
In January 2005, with debts of $90 million and a parent unwilling to provide further funding, the company was placed into voluntary administration. Westbus's problems threatened a major disruption to Sydney's transport network: the company ranked second only to government-owned State Transit in the commuter bus industry. The company was acquired by ComfortDelGro Cabcharge in October 2005. The new owners pledged to honour the company's contractual obligations to customers and staff.
The change of ownership saw the company exchange one politically well-connected shareholder, the Bosnjak family, for another, Cabcharge's Reginald Kermode.
Westbus sponsored the former Sydney Spirit in the NBL.
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