Do I need to prepare any documents for the 60-day Visa Exemption when arriving in Thailand from Vietnam with a European passport?

If you hold a European passport and are arriving in Thailand from Vietnam under the 60-day Visa Exemption, generally, no specific documents are required. However, you might be asked by your airline for proof of onward travel (a ticket out of Thailand within the 60 days). Some travelers have also mentioned the possibility of being asked about proof of funds and accommodation, but this is rare and usually not requested by immigration. Most experiences indicate that the immigration process is straightforward, often only requiring you to state your intended length of stay.