Narcotics suppression police searched the area about 6pm on Monday after a tip-off that a quantity of drugs stuffed in a female child doll would be delivered to a customer there.
Pol Lt Col Kom Chetkhunthod, chief of the Chiang Mai narcotics suppression unit, said a black carrybag containing a doll was found left in a shelter at the airport's parking lot.
A cavity in the doll's chest contained 198 orange and two green methamphetamine pills.
It was the first known case of drugs being delivered in a doll, amid warnings that "Angel Child dolls", or luk thep, a current fad in Thailand, might be used by air passengers to transport drugs.
However, the doll found on Monday looked more like an ordinary doll than an Angel Child.'