The options for transferring funds is discussed extensively in "banking , finance .." forum.
MANY folk use WISE.
You can easily compare various methods on your cell in couple of minutes.
Keep in mind can also depend upon country you are transferring from.
Here is one thread USA specific.
For the OP it's not to significant as it's a one time transfer.
Bank to Bank may be easy option
https://aseannow.com/topic/1212742-money-transfer-from-us-to-thailand/