Out of all the popular cities in Thailand, Phuket City is the cheapest city to hire a car in at just £13/day. Renting a car in Phuket City is 66% cheaper than renting one in Trang where the per day rate is around £37. Other fairly inexpensive cities in Thailand to get a car hire in are: Udon Thani (£14/day), Ko Samui (£14/day), and Chiang Mai (£14/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 £15/day on their transportation. The most popular city to rent a car in Thailand is Bangkok.