By early June Cathay will have added 20 new India flights per week, chief executive Tony Tyler said.
Cathay's services to Mumbai and Delhi will both become daily from Feb 29 with the addition of three flights a week to each city.
The extra flights to Mumbai will continue on to Dubai.
Starting March 30, Cathay will add three more flights to Mumbai, giving it 10 a week to India's commercial hub.
It will also add a daily flight to Delhi, making a total of 14 flights per week to the capital.
On June 1 Cathay will begin four-times-a-week service to Chennai, India's fourth-largest city.
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