There was a total of 7.2 million air passengers in October, down 23.3% against October 2019, according to statistics from the Civil Aviation Authority of Vietnam.
Domestic passengers dropped 0.8% between the periods.
Vietnamese carriers only served 3.5 million passengers in October, falling by 20% against pre-pandemic levels.
Vietnam reopened its borders to foreign tourists in mid-March this year.
Aviation officials expect the number of international passengers going through Vietnamese airports this year to reach 10 million, or around 24% of pre-pandemic levels.
They expect the number of air passengers to increase during the year-end tourism season and the Lunar New Year holiday.