As this is an important matter, it is better updating the information when preparing the trip and always use reliable sources. So, check what kind of Visa you need through official agencies like embassies or the Thai Government. Link 1, Link 2 and Link 3.
There are three options depending on your nationality:
» For tourism purposes, you may obtain a permit of up to 30 days at the same international airport of entry, this is the case of many western nationals.
» The second possibility is that you need a visa, but you can obtain it on arrival at the airport. Nevertheless, travellers from 18 nations can apply for a Thailand e-visa online Link 1 and Link 2, entering into Thailand at Suvarnabhumi, Don Mueang, Phuket or Chiang Mai International Airports.
» Finally, for some citizens is mandatory to get the visa in origin, before departure.
The passport must be valid for at least six months on the day of entry into the country.
Long stay visits 2020–2021
Under the STV program, long-stay visitors can stay in the country for 90 days, which can be extended twice, each for an additional 90 days. The visa will cost 2,000 baht for each extension.
This program is expected to go into effect after the official announcement and will be available until September 30, 2021.
The STV will be granted to long-stay visitors who comply with the preventive and control measures of COVID-19 in force in Thailand at all times: An alternative local state quarantine (ALSQ) of 14 days upon the arrival (update before travelling). They must also justify their long-term residence by booking accommodation, rental agreement or ownership of a condominium.
Source: tatnews.org / September 2020