How can I enter Thailand to live there without an onward ticket?

You don’t need an onward ticket at any time

If you plan to live here you get the proper visa such as Non-O or Non-OA with the proper long stay visa you do not need onward travel ticket.

Get the correct visa before entering. Simple.

Brazil is a better choice for you

Qatar Airways does allow booking one-way flights to Thailand. However, entry to Thailand with a 90-day non-retirement O visa depends on Thailand's immigration rules, which you should verify with the relevant authorities.

Have you ever BEEN to Thailand ?

Yes or no, no matter. Google "How do I retire to Thailand ?"

Just buy a refundable airplane ticket. Don't use those sites that generate fake tickets. Thai immigration is unlikely to check it. Who does check are the airlines and they're going to detect a fake ticket.

Why? Much more to do in the U.S.A. Thailand is boring after few months!!

Apply for a Non Imm O visa if you're 50 or over. Or buy cheap onward travel within your allowed stay

Assuming you are actually above the age of 50....

Apply for Non-O visa before arriving.

You will need it to open a bank account.

Which you will need, along with 800k thb put into it, to apply for a year long extension of stay.

If you want to live there you should apply for non O visa online

helpless

Travelling the globe for a few years and not sure how to enter a country....

Buy an air or train or bus ticket to malaysia or Cambodia or Laos or Myanmar...

just get a bus ticket to Laos. you can get one pretty cheap.

There's also a website where you can get an outgoing air ticket for very inexpensively. that way when you pass immigration you will have proof that you will be moving on. make sure you have Cash with you when you come in as well around $500 USD .

You apply for a 90 day Non-O visa before you travel to Thailand. You can then open a bank account and apply for a 12 month extension of stay

If outside Thailand you should apply for a non-O visa through the closest Thai consulate near you. There are financial requirements, which the Thai Immigration page will outline. The advantage to applying outside the country is it is easier to secure a bank account n Thailand with a non-O visa than it is without it. Then you can leave, facilitate the bank transfers and whatnot, and then apply for the 12 month visa. The initial visa will only be for 90 days. Or, you can fly over, get into the country on a visa waiver that could change from 60-30 days any day now, and apply for the retirement visa once you are here. You can also work with any number of visa agencies that will help facilitate the whole process and Greece the wheels for about $1500, visa fee included. If help with relocations, travel booking, and medical tourism. I am American, from Oregon and California, and I’ve lived here in Thailand for just about 13 years. PM me if you want any help or advice.

What visa will you have ?