What is the best way to extend a 30-day tourist visa in Thailand for Australians?

There has never been a 45 day tourist visa for Australians it's always been 60 day tourist visa you apply for before coming to Thailand or 30 day visa exemption which is only a stamp in your passport its not a 30 visa the 45 days visa exempt ended 31st of march 2023 and why you would plan 40 day stay when the 45 days visa exempt was never going to be extended past 31st of march you have 3 options get 60 day paid visa prior to your departure at thia consulate or embassy or 30 day extension 1900baht thia immigration in thailand or overstay 10 days and pay the fine 500baht per day overstay and you will be flagged in your passport and in thai system as overstay not a good option as thai girls say upto you Chokh di

As already mentioned, you can get 30day extension here. However , it may save you time and money to get 60day tourist visa at the Royal Thai Embassy in Australia.

Go to immigration pay 1900 baht

Tourist visa is 60 days, it was never 30 or 45 days. You're talking about visa exempt which means no visa at all.

Go to your local immigration office when you're here and apply for 30 day extension.

You should also contact your airline and ask them what their policy is for people who travel to Thailand with no visa. Some airlines will require you to show a ticket that you are leaving Thailand within 30 days since you travel without visa.

30 days visa exemption* 1900 thb at immigration office gets u an extension 🤷🏻‍♂️