The cheapest way to get from Adelaide Airport to the Adelaide CBD or various suburbs such as Greenwith, Tea Tree Plaza or Golden Grove Village is to catch public transport via the Adelaide Metro Jetbus routes J1, J2 or J3.
It cost me $3.80 one way to get to stop D1 at Currie St near the Adelaide Central YHA Backpackers Hostel.
If you’re visiting Adelaide make sure you ask the bus driver where he’s going so you don’t accidentally catch the bus to beach side Glenelg or one of Adelaide’s suburbs instead of the inner city where you meant to go.
Also remember to activate your ticket in the machine before you sit down.
A private bus service called Skylink Adelaide also does similar routes but costs roughly twice as much as the Jetbus
A Taxi fare is likely to cost $15 into the centre of Adelaide, which is probably a good option if you’re travelling in a group of 3 or more people with a reasonable amount of luggage to transport.