A woman passenger was arrested on arrival at Phuket airport and charged with smuggling cocaine worth about 10 million baht on Wednesday night.
Police said on Thursday that Weerawan Saengwichian, 27, was taken into custody after 2.3 kilogrammes of cocaine were found in her luggage when her flight from Dubai arrived about 7.30pm on Wednesday.
Customs officials had been tipped off about an attempt to smuggle the drug into the country.
At the airport, her two bags were X-rayed and suspicious content detected in one of the bags.
An inspection revealed a false bottom hiding packaged cocaine.
Ms Weerawan was a native of Bangkok and had travelled from Istanbul via Dubai, where she boarded an Emirates flight to Phuket.