Out of all the popular cities in South Korea, Jeju City is the cheapest city to rent a car in at just HK$241/day. Renting a car in Jeju City is 61% cheaper than renting one in Busan where the per day rate is around HK$612. Other fairly inexpensive cities in South Korea to get a rental car in are: Incheon (HK$360/day), Seoul (HK$509/day), and Gwangju (HK$538/day). While these cities typically have cheaper prices than the rest of the country, travelers looking to rent a car in Seoul should expect to spend around HK$509/day on their transportation. The most popular city to rent a car in South Korea is Seoul.