
DSI chief Pol Colonel Phaisit Wongmuang said Wirapol is expected to arrive at Suvarnabhumi Airport at 10pm or 11pm.
He said the fugitive declined to appeal against an extradition ruling by a court in California.
He is wanted in Thailand on charges of fraud, sexual harassment against a juvenile, and money laundering.
Efforts to extradite Luang Pu Nenkham have been ongoing since last year after a request to do so was made by the DSI to the Office of the Attorney General.
The Office of the Attorney General worked closely with US authorities until the court in California permitted the extradition.
Thailand and the US have a criminal extradition treaty.