Can I return to Thailand on the same day after a short visit to Siem Reap without an overnight stay?

The possibility of returning to Thailand on the same day after a brief trip to Siem Reap depends on the immigration rules in place. Some commenters noted that airlines may enforce an overnight stay requirement for flights from Thailand to Siem Reap, and travelers might be asked to provide proof of accommodation and onward travel. While it's technically possible to return the same day, the consensus is that travelers should verify current airline and immigration policies before making arrangements.