UPDATE 30 Mar 2020: Thailand has banned entry for all non-resident foreigners. Find the exceptions of this rule and required documents when flying to Thailand.
With reference to The declaration of state of emergency in Thailand on 25 March 2020, the Civil Aviation Authority of Thailand issued a travel advisory to passengers traveling to Thailand as follows:
Categories of foreign persons permitted to enter Thailand:
(1) exempted by the Prime Minister or Permanent Secretary of Ministry of Foreign Affairs (MFA)
(2) carriers of necessary cargoes, but required prompt exit after the mission is completed
(3) pilots and crew members of the flight entering Thailand with clear schedules
(4) on diplomatic or consular missions, under international organizations, government representatives, or of international agencies with MFA permission, and their families, with a certificate of entry issued by MFA and a 72-hour Fit to Fly health certificate
(5) acquire a work permit or granted permission to work from Thai government agencies with a 72-hour Fit to Fly health certificate
(6) Thai nationals with certificate of entry to the Kingdom issued by Royal Thai Embassy or Royal Thai Consulate in their country of residence certifying that they are Thais returning to Thailand, and a Fit to Fly Health Certificate.
Those who are allowed to enter Thailand are required to present a valid Health Certificate certifying that the passenger is “Fit-to-Fly” issued no more than 72 hours before traveling.
In addition, passengers are required to fill the T8 Health Form issued under the Communicable Disease Act B.E. 2558 (2015) and present to Disease Control Officers at the quarantine office in their destination airport in Thailand.
You can download AOT App on your mobile phone and complete the T8 Form with your personal information including name, nationality, passport number, active mobile phone number and active e-mail address. The data will be stored for 14 days from the arrival date. This is to allow Thai health officials to contact the travellers in case of an emergency.