I am planning a six-night Bangkok and Chiang Mai trip for late November, entering at Suvarnabhumi and leaving on a confirmed return flight. I am anxious about choosing an eVisa when an exemption might apply, so I want to compare the passport, arrival airport, hotel confirmations, onward ticket and intended activities against the rule in force on my travel date.
Decide in this order: identify the passport actually used, entry point, dates, length, purpose and residence, then compare the current exemption, visa and any arrival route on an official page. Keep a checklist of passport validity and blank-page conditions if stated, return or onward booking, accommodation, funds and any application documents requested; apply only through the official channel if a visa is required. Recheck shortly before departure because lists, entry points, fees and stay conditions can change, and do not treat a travel blog or an approval as an entry guarantee: https://www.thaievisa.go.th/.