(Updated last June 1, 2018)
Securing Visas upon entry in Thailand
The VISA ON ARRIVAL allows passport holders of 21* countries to enter Thailand under this rule provided that they meet these requirements:
You must have a confirmed return ticket to show that they are flying out of Thailand within 15 days of entry, as appropriate. Open tickets do not qualify. Travelling overland out of Thailand by train, bus, etc to Cambodia, Laos, Malaysia (including en route to Singapore), Myanmar, etc is not accepted as proof of exiting Thailand.
You may be asked to show your flight ticket on entering Thailand. If you do not possess a flight ticket to show that you will be exiting Thailand within 15 days of entry you will be most likely refused entry.
However, persons who are not eligible to enter Thailand under the VISA ON ARRIVAL and VISA EXEMPTION RULE are advised to obtain visas with the Royal Thai Embassy prior to their visit.
* List of countries eligible for the Visa on Arrival:
List of Thailand’s Immigration Checkpoints which provide facilities for issuance of visa on arrival: