Can I apply for a 90-Day Non-Immigrant O Visa without a planned travel date?

You can apply for the 90-Day Non-Immigrant O Visa online; however, although you're asked for flight details during the application, taking that exact flight is not mandatory. It is important to note that the visa must be activated within 90 days of its issue date, which means you need to arrive in Thailand within that timeframe to get your 90-day stamp upon arrival. Additionally, travelers from certain countries may have alternatives such as a 60-day exemption followed by a 30-day extension.