Do I need proof of an outbound flight when entering Thailand on a Non-O visa for retirement?

When flying into Thailand on a Non-O visa for retirement, it is generally not required to provide proof of an outbound flight. Most responses indicate that travelers with a Non-O visa can enter Thailand without an onward ticket. However, there are exceptions where airline staff may request proof, particularly if they perceive potential immigration issues. It's advisable to check with the airline prior to travel.