What is the best way to transfer 800,000 baht from the US to a Thai bank for a visa?

I use wise transfer

Wise TRX - “Funds for long term stay in Thailand” cited reason so the TRX shows as international Transfer when the bank statement used for Non-o extension.

I used Bangkok Bank’s SWiFT code and wire transferred it from my American bank. Fast, easy, and secure.

Blockchain

Routing numbers are a US system for US transfers, just like IBAN is a European system. It isn't used in Thailand. For international transfers, you need the SWIFT code and the bank account number.

I’m sure you mean 800 K baht(8000 K won’t work) and swift transfer is easy

I just went through today when I used Wise. It seemed that if you did a wire transfer it needed to go to Wise's JP Morgan account then to your account as a domestic transfer. I wasn't sure if that would show it as a domestic or international transfer, so I went with the transfer directly from my bank, fees sucked compared to wire transfer but I felt better about it showing as an international transfer. If you go straight from your bank, you need the swift code for whatever bank you are transferring to. My research showed that after the $25 fee from Navy Federal credit union, the possible charges from your Thai bank and a less than favorable exchange rate, Wise was the way to go. At least with Wise you know what you are getting upfront. Also, it's 800,000 baht for a visa.

you mean 800,000, right?

Cash to open the account