How can I transfer money from a US bank to a Thai bank to validate my 'O' visa extension?

With an international bank transfer, ask your Thai bank the details and tell these to you bank in the US. There are alternatives like Transferwise but it seems that it is cheaper but gives sometimes a national transfer in stead of the needed international. For further questions please check out this friendly group set up by one of our members. 3&hc_location=group