Keolis Downer has released new bus and ferry timetables to take effect on June 30, including changes due to the expansion of Lake Macquarie's on-demand bus service.
The frequency of routes 41, 43 and 48 from Belmont to Charlestown will fall from one hour to two hours on weekends and between the morning and afternoon peak hours during the week.
Other changes include the Stockton ferry leaving and arriving at slightly different times to match up better with light-rail services.
Keolis Downer corporate affairs director Andrew Fletcher said the changes also included "tweaks" to other public and school bus services.
He said customer and staff feedback and data from more than 200,000 trips had informed the changes, which would improve reliability and connections.
"There will be no changes to routes, and existing operating hours will be maintained. Light rail services are not affected," Mr Fletcher said.
Keolis Downer urged customers to plan their trips before the changes came into effect.
On-demand buses will expand into Redhead, Jewells, Floraville, Croudace Bay, Valentine, Belmont North and Belmont from June 30.
The service also covers Dudley, Whitebridge, Mount Hutton, Windale, Tingira Heights, Eleebana, Warners Bay, Gateshead and Charlestown.
"While you won't need a timetable for the on-demand service, customers can now explore the easy-to-use Newcastle Transport On Demand app to see if they are in the area and where they can travel to," Mr Fletcher said.