Out of all the popular cities in Ireland, Dublin is the cheapest city to rent a car in at just C$ 10/day. Renting a car in Dublin is 78% cheaper than renting one in Knock where the per day rate is around C$ 44. Other fairly inexpensive cities in Ireland to get a rental car in are: Cork (C$ 15/day), Shannon (C$ 24/day), and Milltown (Kerry) (C$ 34/day). While these cities typically have cheaper prices than the rest of the country, travelers looking to rent a car in Dublin should expect to spend around C$ 10/day on their transportation. The most popular city to rent a car in Ireland is Dublin.