A joint venture, known as ComfortDelGro Cabcharge (CDC), was established between ComfortDelGro (51%) and Cabcharge Australia (49%) in October 2005 to purchase loss-making Westbus Group, which included Westbus (both Australia & UK), Hillsbus and Blue Ribbon from National Express and the Bosnjak family.

[6][7][8] In August 2006, the routes of Baxter's Bus Lines were purchased by and absorbed into Westbus Region 3 operations.

In late August that year, CDC announced it would not proceed with the planned acquisition of Custom Coaches or the construction of the Rutherford bus building plant.

Cabcharge stated that "given the current world economic situation", the two CDC shareholders decided they "should not proceed with this (bus building) business in Australia", and they would "focus on their core operations".

[22] The former joint venture was then renamed ComfortDelGro Corporation Australia, still keeping the abbreviation CDC.

[26][27][28] In November 2018, the Buslink business was acquired with 401 buses operating in the Northern Territory, Queensland, New South Wales and Victoria.

[40][41][42] In October 2021, CDC acquired a school bus contract and five buses from KA & VK Stubbs in Narrabri, New South Wales.

The school bus operation was merged into CDC's existing Forest Coach Lines business in Narrabri and Wee Waa.

[47][48] In December 2023, CDC entered into a scheme of arrangement to purchase its former joint venture partner A2B Australia (which had rebranded from Cabcharge in 2018), subject to shareholder and regulatory approval.

[49] ComfortDelgro Corporation Australia operates: CDC's Regional Australia Division (RAD) was established in early 2021 and has responsibilities over the Northern Territory, Queensland, the Australian Capital Territory and regional NSW (Blanch's, CDC Canberra and Forest outside Sydney) operations.

In 2005, Westbus, Hillsbus and Blue Ribbon were the first three bus companies to be purchased by ComfortDelGro Cabcharge.

[52] Beginning from 2023, the various operations in the state were rebranded as CDC NSW, starting with Hillsbus and Forest Coach Lines (Sydney only) in April and May that year.

[45][46] In February 2009, when ComfortDelGro Cabcharge entered the Victorian bus market with the acquisition of Kefford Corporation for A$149 million, with its fleet of 328 buses and six depots.

[37][38] ComfortDelGro acquired Rockhampton-based Young's Bus Service in 2021, which was rebranded into CDC Queensland in December 2024.