Customs Department Deputy Director-General Yuttana Yimgarund and National Park, Wildlife and Plant Conservation Department Deputy Director-General Sermyot Sommun jointly told a news conference ofn the seizure.
Mr Yuttana said a Vietnamese couple -- Pham Ngoc Tuan and his wife Pham thi Kim Chi--were arrested.
The authorities confiscated 27 pieces of African ivory weighing 105 kg, with a street value of Bt16 million.
Mr Yuttana said that the authorities at Suvarnabhumi Airport noticed irregularity in four pieces of baggage as the X-ray scanner showed elephant tusk-like objects.
Forestry officials were called in to inspect the four bags and found ivory shipped from the Angolan capital of Luanda which travelled by Ethiopian Airlines to Suvarnabhumi Airport, with a final destination in Siem Reap, Cambodia.
The couple said they were paid Bt50,000 for the shipment.