An extra 26 bendy buses will run between Bondi Beach and Circular Quay every six minutes outside peak periods and every 10 minutes at night from late September, Transport Minister Andrew Constance announced on Monday.

Mr Constance said the 'Bondi link' service would be a "high-frequency, high-capacity bus service" that would add 1100 services and shuttle an extra 29,000 people along the 333 route each week.

"It will enable more than 1000 extra customers to get on a bus along Bondi Road during the morning peak alone. We will also boost capacity by 10,000 on the weekends for families and tourists visiting Bondi Beach."

An overnight bus on the route will operate all-stops between the city centre and North Bondi, seven days a week.

Mr Constance said the service would mirror the northern beaches' 'B-line' double-decker bus service that runs between Mona Vale and the city centre every five minutes during peak periods.

"Everyone has loved B-line, everyone is going to love Bondi link because of the very nature of the turn up and go service."

He said power lines along Oxford Street and Bondi Road meant the route had to be serviced by the bendy buses, drawn from the existing fleet, rather than double-decker buses.

Those buses could fit more than 100 people, compared to 60 commuters on a standard bus.

Unlike the northern beaches service, the Bondi link buses would not travel along a dedicated traffic lane on the notoriously congested route between the beach and city centre.

But Mr Constance hoped the added capacity and frequency of bus services should encourage more commuters to opt for public transport and reduce the number of cars on the road.

"I'd sooner have 100 people on a bus instead of 100 people in cars, and that's the aim in terms of the service."

Some commuters would also get off at Bondi Junction train station, he said, where adult Opal cardholders could benefit from a $2 discount for switching modes of public transport in a single journey.

State Transit Authority chief executive Steffen Faurby said the service provided "a real alternative to people driving their cars" and allowed commuters to "turn up and be able to get on a bus without having to worry about a timetable".

Mr Faurby said the authority had completed "extensive audits and reviewed the situation around Bondi Junction" to make sure the bus interchange could cope with the new services.

Vaucluse MP Gabrielle Upton welcomed the "long-awaited" boost to services along the route, which she said was one of the busiest in NSW.

"Not only are there the locals but of course you've got all the international visitors who come here to see this world-famous beach."

Waverley mayor John Wakefield said he welcomed any improvements to public transport in the area, but not at the expense of other services.

"There are long-outstanding issues in the area including Oxford Street and Rowe Street into the Bondi Junction bus rail interchange ... and the cutting of other bus services in the eastern suburbs which we are requesting be resurrected, such as the Bondi to Rose Bay service and the direct 378 from Bronte Beach to the city."