sorry but the nativity is strong in this one. Previously it cost nothing to enter on visa exempt. Now it will. The USA it's $21, EU and UK about £10. The departure tax in the UK is always a target at the budget.
at least I tried to be helpful as there is not much info out there. But some say Dec 24, others first quarter 25 and other June 25. So Siam Legal info is similar to others.
Aldo the fee, it has not yet been announced so there could be a fee.
But you need to DYOR. Sorry for using capital but it's an acronym
oh good, UK, USA and EU charge. Remember the UK already has a tourist/departure tax and those have NOTHING to do with the ETA. So it is not unreasonable to expect the ETA will not be free for long.
While announced in June, the Thai Ministry of Foreign Affairs (MFA) reported on August 23, 2024, that they were accelerating plans to implement the ETA system. It is expected to go online in December 2024 and be fully rolled out and mandatory for all travelers in June 2025.