Hanoi authorities arrested a Philippine passenger for carrying 3.6 kilograms of cocaine at Noi Bai International Airport on Saturday.
Custom officers at the airport said scanners found 18 packs of white powder in the suitcase of Kamacho Sillo Emmanul, 38, after he arrived on a flight from Singapore at 11:50 a.m.
They said the packs were hidden in socks.
The passenger had started his journey in Sao Paulo, Brazil, before transferring in Singapore and landing in Hanoi. .
Subsequent tests showed the white powder was cocaine weighing a total of 3.6 kilograms.
The passenger was handed over to local anti-narcotics police for investigation.
Vietnam has some of the world's toughest drug laws. According to its Penal Code, those convicted of smuggling 100 grams of heroin or cocaine or 300 grams of other drugs can be sentenced to death.
On August 20, a 31-year-old Thai woman was sentenced to death after a Ho Chi Minh City court found her guilty of smuggling nearly two kilograms of cocaine from Brazil to Vietnam last October.
A day earlier, the HCMC court also sentenced Ejiogu Benjamin Ikechukwu, 31, a Nigerian man, to death for smuggling more than 3.4 kilograms of methamphetamine from Qatar into Vietnam in June last year.
In October 2012, Vietnam sentenced a 61-year-old Filipina to death after she was caught smuggling five kilograms (11 pounds) of methamphetamine into the country.
Four months earlier, a HCMC court handed down the death penalty to a 23-year-old female student from Thailand for trafficking three kilograms of methamphetamine from Benin to Vietnam.