The airline is a member of Cathay Pacific Group.
"We are satisfied with the passenger load from Kolkata. The average passenger load from here to Hong Kong is 80 to 85 per cent. So we have decided to add another flight from today," Cathay Pacific and Dragonair GM (South Asia, Middle East and Africa) Charlie Stewart-Cox said.
He said the carrier was operating an Airbus A-320 aircraft from the city, which according to him, was apt for the sector.
Cathay Pacific also operates two cargo freighters from Kolkata, he added.