Out of all the popular cities in Croatia, Zagreb is the cheapest city to hire a car in at just $18/day. Renting a car in Zagreb is 78% cheaper than renting one in Rijeka where the per day rate is around $80. Other fairly inexpensive cities in Croatia to get a car hire in are: Split ($26/day), Zadar ($26/day), and Dubrovnik ($35/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 $35/day on their transportation. The most popular city to rent a car in Croatia is Dubrovnik.