Out of all the popular cities in United Kingdom, Manchester is the cheapest city to rent a car in at just $23/day. Renting a car in Manchester is 59% cheaper than renting one in Leeds where the per day rate is around $54. Other fairly inexpensive cities in United Kingdom to get a rental car in are: Edinburgh ($26/day), London ($26/day), and Belfast ($41/day). While these cities typically have cheaper prices than the rest of the country, travellers looking to rent a car in London should expect to spend around $26/day on their transportation. The most popular city to rent a car in United Kingdom is London.