Hi! We’re planning to stay 90 days in Thailand. We will have 60 days on arrival, can we ask for the 30day extension right away after arrival or we need to wait a certain number of days to go to the immigration office?
TLDR : Answer Summary
You cannot apply for a 30-day extension immediately upon arrival in Thailand. Most immigration offices allow applications when you have 30 days or less remaining; some may allow it when you have 45 days left. However, in places with stricter policies, you may only apply when 7 days or less remain on your visa.