Out of all the popular cities in Australia, Melbourne is the cheapest city to hire a car in at just £11/day. Renting a car in Melbourne is 52% cheaper than renting one in Canberra where the per day rate is around £21. Other fairly inexpensive cities in Australia to get a car hire in are: Brisbane (£13/day), Adelaide (£13/day), and Sydney (£13/day). While these cities typically have cheaper prices than the rest of the country, travellers looking to hire a car in Sydney should expect to spend around £13/day on their transportation. The most popular city to rent a car in Australia is Sydney.