Do I need a return ticket to enter Thailand as a tourist?

Now I did that last year, at Vietnam check-in they were adamant that an onward ticket was presented before boarding to Vietnam also.

It's not necessarily a return but rather a trip out, For me arriving from USA leaving in less than 60 days to Vietnam

It's in the rules and has been for many years

Can you read about at the airport? They’ve been turning lots of people away that didn’t have return tickets or didn’t do their tdak there arrival online don’t take no chance.

It’s a good precaution

Proof of leaving might be asked for by airline, it doesn't have to be return ticket.

The departure field of the TDAC form is not mandatory, it can be left empty, and your return flight will not be a problem at the Immigration in case they ask. . .

HOWEVER, it might be a problem with your airline. Many airlines will ask you for an onward travel proof out of Thailand within the first 60 days you will get stamped in. They won't allow you to board the flight unless you show either a fake onwardticket (which I do NOT recommend!) or a cheap budget airline one-way flight ticket for example from Hat Yai to Kuala Lumpur that can be had for $40 Dollar. It doesn't have to be a return ticket.

You should contact your airline by email (do not call!) and ask them on their stance, then you will get some reply you can print out and take to the check-in just in case the check-in staff has a different opinion

U probably wont get boarded when u check in in airport

A question mostly for your airline

Im coming not come?

For tourist yes