Futsalroos claim silver in AFF Championship
The defending title-holders stormed home to take the decider 6-0 and claim a record 10th crown.
The Australians arrived at Malawati Stadium in Shah Alam, Malaysia full of confidence after a rousing extra-time win over Vietnam in the semi-finals.
But two early goals, against a side retaining numerous players from their FIFA Futsal World Cup campaign, meant the Futsalroos were always chasing the game.
Thailand took a deserved lead after five minutes with a well-worked team goal finished by Piyapan Ratana.
Still reeling from conceding the opener, the Aussies quickly found themselves two behind barely a minute later after Thailand were allowed to easily press on goal.
The Futsalroos managed to prevent any further scoring before the break but were finding it difficult to settle into the match and fashion any chances of their own.
Chasing the game in the second-half was always going to be a difficult task against one of Asia's futsal powerhouses.
The Futsalroos continued to play the attacking style that had marked their run to the final but Thailand proved to have too much precision on the day.
Thailand scored four unanswered goals in the second half to complete the rout.