The changes coincide with a decision to raise the age for child fares from 18 to 19 years.
The company is also introducing a family ticket for one adult and up to three children called the All Day Glo4.
It will run alongside the existing All Day Glo5 for two adults and up to three children.
From 5 January until further notice Yellow Buses is also cutting the cost of the Network Plus on routes 4c and 4d which serve Ferndown, Wimborne and West Moors.
Full details of the new fares can be found at www.bybus.co.uk