The charge will reportedly go towards developing attractions and covering accident insurance for foreigners unable to pay costs themselves.
Part of the fee will be used to "take care of tourists", Tourism Authority of Thailand governor Yuthasak Supasorn told Reuters.
"We’ve encountered times when insurance didn’t have coverage for tourists… which became our burden to take care of them," he said, adding that funds would also be used to upgrade tourism infrastructure.
The new fee will be priced in with airline tickets and is part of the government’s sustainable tourism plans, government spokesperson Thanakorn Wangboonkongchana said.