Surat Thani is a city in Amphoe Mueang Surat Thani, Surat Thani Province, southern Thailand. It lies 651 km (405 mi) south of Bangkok. It is the capital of Surat Thani Province. The city has a population of 132,040 (2019), and an area of 68.97 km2 (26.63 sq mi). The city's population density is 1,914 inhabitants per km2.