The capacity upgrades will be phased in from March, the airlines said.
Growing passenger demand and additional aircraft joining the fleet have prompted the capacity hike, part of the Doha-based airline's aggressive expansion strategy to offer consumers more choice.
The airline said that its daily Bengaluru (Bangalore) services will be upgraded from a narrow-body Airbus A320 aircraft to a wide-body A330, marking the first anniversary of the route's launch.
The expansion includes three additional weekly flights to Kuala Lumpur, making it a double daily operation and two extra services deployed to the Tanzanian capital Dar Es Salaam, also doubling its frequency.
Flights in the Gulf will increase with three extra weekly services to the Omani capital Muscat with capacity rising to 24 flights each week.
In Europe, where Qatar Airways is concentrating much of its expansion over the next two months with new route launches to Bucharest, Budapest, Brussels and Stuttgart, the airline has also earmarked a number of capacity increases to and from existing destinations in its network.
The double daily Paris route will rise to 16 weekly services with an extra two flights a week, while Geneva capacity will increase to daily following the introduction of two new weekly flights.
News of the European additions follow the recent announcement that Qatar Airways' Copenhagen route will go daily with one extra flight a week, and the introduction of a wide body Airbus A330 on the daily Barcelona services.
Qatar Airways Chief Executive Officer Akbar Al Baker said: "With an average of more than one new aircraft being introduced into the fleet every month, Qatar Airways is looking to deploy the new capacity on existing routes while, at the same time launch new routes to join our ever-growing international network".
From Europe and Africa to the Middle East and Asia, our network will see more capacity, improved schedules and, more importantly, more choice for our large passenger base and new clientele.
There will be further route expansion announcements over the next few weeks.