Police said inquiries were continuing to locate anyone else involved.
The incident follows a series of violent incidents on Auckland buses this year.
In March, a 21-year-old student was punched by a stranger while travelling home from Massey University’s Albany campus and Takapuna.
His father told the Herald at the time that his son had been left shaken by the attack and urged other passengers to remain vigilant.
Police later linked a 36-year-old man, who had been arrested over a separate matter, to the assault.
In February, a 20-year-old woman was charged after allegedly attacking a bus driver who refused to let her board on Queen St in the central city.
Police said the woman chased the bus before forcing her way aboard and assaulting the driver during the late evening.
The woman fled before police arrived, while an ambulance was called to treat the injured driver.
Officers later spotted her near Vulcan Lane, where she allegedly attempted to flee again before being arrested and charged with injuring with intent to injure.
A woman travelling to work back in January, was allegedly assaulted by a group of passengers near the back of a West Auckland bus.
The alleged attack was understood to have been unprovoked.
Auckland Transport said the driver was unaware of the altercation until it was brought to their attention at the end of the journey.