Hello everyone, when applying for a non-immigrant O retirement visa through Thai embassy in London, the section which asks to provide flight details can the flight details be one way or does it have to be a return ticket.

Thank you in advance for contributing any advice. 🙏

I would like to apply for a non-O e-Visa based on being over 50 (Los Angeles) and have a couple of questions. First, does anyone have an estimate for how long that usually takes to be processed? Second, is it necessary to purchase a flight before applying? I ask the latter because I would prefer to apply now even though I don't plan to go to Thailand until possibly as late as mid October and since I don't know exactly when I prefer to wait to book a flight. If you're wondering (quite reasonably) why I don't just wait until I know when I can go, that depends on the answer to the first question. If it is a long process, I may not be in a place where I can easily apply online with all the documentation I need. I guess a third, related question, is what happens if you apply for a visa with one flight's details and then change your flight?