Hello, I want apply for a STV and on the online page they need a flight umber. But I didn't booked yet because I want go back to Thailand soon as possible, but I don't know how long I have to wait for the visa. Have anyone experience in this? I am now on Austria
TLDR : Answer Summary
To apply for the Special Tourist Visa (STV) for Thailand, you must have a booked flight and confirmed accommodations for at least three months along with health insurance. Although you may not have a flight booked yet, it is advisable to choose a flight that you expect to take, as confirmed flights are necessary for the Thailand Pass requirement.