Most of the flights are from HCMC and Hanoi to Vinh, Thanh Hoa, Hai Phong, Da Nang, and Hue, the airline said.
In all there will 9,200 flights with 1.9 million seats between January 1 and February 5.
Vietnam Airlines had earlier announced three additions in August and December for Tet in late January.
Other carriers like Vietjet, Bamboo Airways and Vietravel Airlines have also added flights.
Data from the Civil Aviation Authority of Vietnam showed that more than 90% of seats on flights from HCMC to central and northern destinations between January 14-21 had been booked as of January 12.
Many people from the central provinces of Thanh Hoa, Nghe An and Quang Binh work in the southern city and return to their hometown to celebrate Tet with their family.