What are the visa options and requirements for staying in Thailand for 3 to 4 months as an Australian citizen?

60 day visa exemption stamp on arrival, 30 day extension for ฿1,900 THB at your local Soromor (immigration office)…that gives you 90 days 3 months

Border Bounce to neighboring county or wherever for an additional 60 day visa exemption stamp on arrival back into Thailand…you now have 5 months in Thailand…but wait there’s more…you can also get another 30 day extension for ฿1,900 THB at your local sotomor(immigration office)

This will get you 180 days or 6 months in total

For the haters…life happens and plans change that’s why I put the additional 30 day extension in my response

Oops ,up to 9 months

Get a multiple entry tourist visa ,you can get up to 90 days from that

Don't really need visa..

Australian passport gives you 60 days and you can get 30 day extension..than do border run and get same again

You can stay 4 months by simply doing a border run. Visas are for longer stays and not worth getting if you only want to stay for 3-4 months.

Completely depends on your nationality. Without that crucial bit of information we can’t help you.