Out of all the popular cities in Ireland, Shannon is the cheapest city to rent a car in at just C$ 8/day. Renting a car in Shannon is 60% cheaper than renting one in Galway where the per day rate is around C$ 20. Other fairly inexpensive cities in Ireland to get a rental car in are: Dublin (C$ 13/day), Cork (C$ 17/day), and Galway (C$ 20/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$ 13/day on their transportation. The most popular city to rent a car in Ireland is Dublin.