Language: The official language in Thailand is Thai. Many locals can speak some or fluent English. However, it is recommended that you learn some Thai, especially for bartering in markets. Currency: The currency used in Thailand is Thai Baht. Payment options: In Thailand’s main cities, you won’t find any problems with using credit cards as a form of payment or ATMs to withdraw cash. However, you’ll need to pay cash for your purchases at local markets and small eateries. Plugs: The standard voltage in Thailand is 230 V. The plugs are types A, B, and C.