It operates seven routes under contract to Public Transport Victoria.

Sunbury Bus Service was formed by Richard Baird and Don McKenzie in March 1980 following the purchase of the business of WJ Treweek.

[2] It is today part of the Donric Group.

As at February 2023, the fleet consisted of 108 buses and coaches.

[1] Operator livery is white with red & black stripes while newer route buses have the PTV livery.