Thanks for letting me join.
Am a visa newbie (as such) and on my first ever 60 day visa.
Question is if I want to extend by another 30 making it 90 days (will be in Bangkok more than likely) I need my passport and what else?
I have googled this and getting mixed reports.
At the moment I do not have a flight out of Thailand booked. Would I need to show a ticket or proof of a flight out at the 90 day period?
Thanks in advance.
TLDR : Answer Summary
To extend your 60-day visa to 90 days in Thailand, you will need your passport and possibly other documents like a passport photo and a completed application form. The fee for the extension is around 1900 baht. You may be advised to use a smaller immigration office for quicker service. Regarding flight proof, it's unclear, so it's best to check the specific requirements at the time of your application.