Do I need to show an onward ticket if I have a 60-day ticket but no TR visa for travel to Thailand?

If you are entering Thailand on a visa exemption without a TR visa, you may be required to provide proof of onward travel before boarding your flight. Airlines often refuse boarding to passengers without evidence of exit plans for the 30-day period of stay. However, once in Thailand, immigration may not ask for your exit plans when you choose to extend your stay.