Length of permitted stay is determined by your passport nationality, not where you are coming from, unless you have a 60 day tourist visa already granted by a Thai embassy/consulate.

It doesn't matter that she came from the USA or have legal residency there. Visas and extensions are based on passport nationality. She won't qualify for extensions since she entered on a Vietnam passport.

@Brandon ***********

no idea why the OP interpreted your simple clarification request so negatively that he would call you a dick. Your question seems absolutely normally phrased to me and completely reasonable.

@Raffaele ***********

you misunderstood. You can't get two 30 days extensions back to back. In other words, you can't do 45+30+30 in one entry to Thailand because you can't get the second 30 day extension within 1 entry. Once you leave and come back, it starts all over with your initial entry plus one extension.There's no look back, beyond the usual caveat that immigration always has the right to look at your stay history in deciding whether to grant extensions.

Set up a company with minimum 2 million baht capital, hire 4 Thai employees to qualify for a work permit, and get your Non-B visa. Before you ask about lawyers and accountants, make sure you understand the basic requirements.

@Jessica ********

you don't qualify for visa on arrival Your nationality instead qualifies for 45 day visa exempt entry where you just show up and don't need to buy a visa on arrival

You can extend the tourist visa one time for 30 additional days.

There are not multiple terminals at Suvarnabhumi. Not like LAX or JFK. Just one big giant terminal. Won't matter which airline you take. You exit international baggage claim at the same place and go to the departures level where all airlines do their check-ins.

@Michael ******

there is no 45 day visa. There is either a 60 day tourist visa or a 45 day visa exempt entry (no visa granted) starting 1st October.

While no one wants to pay more than necessary, I doubt many people who have the $1 million USD assets and half million to invest in Thai government bonds, or who meet the other wealthy individual qualification criteria would be overly concerned about 7000 baht as they likely make that much in income in a few hours every day, and easily spend that much daily in their everyday lives.