The Ministry of Public Health has removed the People’s Republic of China (including Hong Kong and Macao Special Administrative Regions) and the Republic of Korea from the list of dangerous communicable disease areas for COVID-19 outside the Kingdom of Thailand.
The announcement on the removal was published in the Royal Gazette on 15 May 2020 and took effect on 16 May 2020. It stated that the two countries had shown their effectiveness in preventing and containing the COVID-19 outbreak.
However, this does not mean that visitors from the two countries will be able to visit Thailand anytime soon. Under the current Declaration of an Emergency Situation in all areas of the Kingdom of Thailand, the closure of entry/access points (land, sea and air) to Thailand remains in place until 31 May 2020.
The Civil Aviation Authority of Thailand (CAAT) on 16 May 2020 also issued its fifth notification extending a ban on all international passenger flights to Thailand until the end of June 2020.
Source: https://thailand.prd.go.th/ewt_news.php?nid=9516&filename=index&fbclid=IwAR3gOGv05x1EVpfQeijiq2xU7WLHv19dc5Gg503civgcXUuv_n8ydz2qZKs