Out of all the popular cities in Thailand, Phuket City is the cheapest city to hire a car in at just £12/day. Renting a car in Phuket City is 40% cheaper than renting one in Buri Ram where the per day rate is around £19. Other fairly inexpensive cities in Thailand to get a car hire in are: Bangkok (£12/day), Khon Kaen (£12/day), and Udon Thani (£12/day). While these cities typically have cheaper prices than the rest of the country, travellers looking to hire a car in Bangkok should expect to spend around £12/day on their transportation. The most popular city to rent a car in Thailand is Bangkok.