wow so reactive! thank you so much 😊 maybe they dont know cos probably there most flights are domestic... i flew from utapao a couple of times but cant remember, although the airport is really small they have like 2gates 😆
when i did this in Jomtien (pattaya) immigration last March they also asked me proof of accommodation (they give you paper to be filled by your hotel or owner of condo/apartment with stamp and receipt of payment). i dont know if it s just at Jomtien or everywhere. i also noticed that in the afternoon is less crowded.