Sorry to ask this again but it's because I've read two different answers in threads here and I need to clear this up before I go ahead. I am planning on getting a SETV here in the UK before I arrive in Thailand this November. My question is do I NEED to book an onward journey BEFORE I arrive in Thailand ? If so do I book the flight just before the 60 days or just before the 90 days ? ( 60 + 30 day extension) I'm planning on going to Vietnam to obtain another SETV once my 60 + 30 days have expired.....
TLDR : Answer Summary
When applying for a Single Entry Tourist Visa (SETV) from the UK, proof of onward travel is generally not required by the Thai consulate. Upon arrival in Thailand, you will receive a 60-day stay, which can be extended for another 30 days. The 60 days begins on your date of arrival, and you must enter Thailand within the validity of the visa issued (typically within 3 months of application). While airlines may sometimes ask for onward travel confirmation, it is not a strict immigration requirement.