Out of all the popular cities in Croatia, Zagreb is the cheapest city to hire a car in at just $17/day. Renting a car in Zagreb is 78% cheaper than renting one in Rijeka where the per day rate is around $76. Other fairly inexpensive cities in Croatia to get a car hire in are: Split ($25/day), Zadar ($25/day), and Dubrovnik ($34/day). While these cities typically have cheaper prices than the rest of the country, travellers looking to hire a car in Dubrovnik should expect to spend around $34/day on their transportation. The most popular city to rent a car in Croatia is Dubrovnik.