If immigrations made me book a return flight at the airport (because I’m here too long), Is it possible to renew my 30 day visa exempt in person or no? (USA passport)
TLDR : Answer Summary
When applying for a 30-day extension of a visa exempt entry stamp in Thailand, it's essential to note that the decision lies with the immigration officer you encounter. If you're currently on a 30-day visa exempt entry and seek an extension, approval isn't guaranteed and, if denied, you may receive a 7-day stamp. Additionally, proof of 20,000 baht in cash, onward travel, and accommodation may be requested upon entry, though these do not directly affect the extension process.