highly unlikely that the airline is going to ask you for the onward travel proof when you hold a visa. They mostly ask people who want to enter Thailand visa-exempt
pretty HARSH requirements for the multi entry type TR visa. It's much easier to get the single entry Tourist visa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. Financial evidence, e.g. bank statements, proof of earnings, sponsorship letter (current balance not less than 200,000 THB for the past 6 months).
- Your recent official UK/Ireland bank statement shows your name, address, and a minimum closing balance of £5,000 (Do not send the screenshot) , proof of earnings (payslips) or sponsorship letter from your sponsor with official ID and their Bank Statements.
6. Proof of accommodation in Thailand, e.g. Accommodation bookings, invitation letters from family/friends in Thailand (of the first visit).
- Invitation letters from family/friends must be submitted with their respective official photo ID.
- Accommodation booking must have details of applicant name/ date (check in and check out)/ address and contact no. of your accommodation.
. . . .if you don't qualify for the multi entry 6-months Tourist Visa, then the other option is applying for the single entry 60-Days Tourist Visa. You will get stamped in for 60 days, then extend on immigration for 1900.- THB fee for extra 30 days. Before the 90 days are over, do a "border run", re-enter Thailand visa exempt. You will get stamped in for 30 days, which you can, too, extend once for 30 more days. Then do a second border run and re-entry, receive 30 days again. So your total can be maxxed out at 60+30+30+30+30 = 180 days = 6 months stay
it's the Immigration who confuses "visa" with "stay permit". They don't make any difference between the actually two technically different things. Immigration talks about "extending the visa" although they are just extending stay permits. The visa you entered with, has been made invalid upon entry, there is nothing left of said visa that can be extended
you seem not to hold a Non-Imm-O "visa" any more, but you are on a "1-year extension of stay permit" based on retirement. You have a "stay permit", not a "visa". Well it doesn't make any difference, you can fly one-way to Thailand, there is no need to show any onward travel proof to the airline that flies you to Thailand
there are no visa stickers in your passport if it got issued by the online E-visa system. It's a pdf document. You need to present the printed document if you want to get stamped in on it