Air India's new daily flight programme between and Delhi and Amritsar will commence later this month.
The carrier is due to take delivery of its 18th Boeing 787 Dreamliner aircraft enabling the service to commence on December 21.
By extending the Birmingham operation from four flights a week to daily services, the airline will offer more than 3,500 seats on the route each week.
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The move comes just 15 months after launching the Birmingham route which has carried more than 106,000 passengers.
Other recent additions to Birmingham's portfolio of routes and
Adding Wednesday, Friday and Sunday to its schedule, Air India's programme will see flights arriving from Amritsar and Delhi at 5pm daily and departing Birmingham for the return legs at 8.30pm.
Birmingham Airport chief executive Paul Kehoe said: "We are incredibly thankful to Air India for committing to daily services from Birmingham and adding more direct capacity to India from the Midlands.
"The West Midlands receives more foreign direct investment from India than any other region outside of London and Birmingham's 'visiting friends and relatives' (VFR) market grew by 71 per cent in 2013, now attracting more visitors from India than any English city other than London.
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"It's therefore hardly surprising that the route has been such a success since its inauguration in August last year as it allows people to travel from their local catchment area, rather than airports further away."
Vishwanath Panyam, Air India's assistant general manager, added: "The West Midlands is a diverse region and home to more than 200,000 British-Indian people so we are pleased to be able to not only serve this extensive VFR market but also give business travellers direct access to the whole of India via Delhi on the comfortable, quiet and state of the art Boeing-787 Dreamliner aircraft.
"I hope that the daily services will offer greater choice, flexibility and convenience and make the Birmingham flights even more appealing to local people."