Can I enter Thailand without a visa and extend my stay for 30 days after arrival?

If you arrive in Thailand without a visa, you are permitted to stay for up to 30 days under the visa-exempt rule. However, it is crucial to have proof of onward travel, as some airlines may require it before boarding your flight. After entering, you can apply for a 30-day extension at immigration for a fee of 1,900 baht. The extension adds to your initial stay, meaning if you arrive on the 1st and extend on the 2nd, your total stay should be 59 days (30 days initial + 30 days extension). Consider having a flexible return ticket and confirming the latest entry requirements, including the possible necessity for a Thai Pass.