The partnership is effective from Monday, Qatar Airways said.
Qatar Airways currently operates to 13 cities in India from its Doha hub while the Tata-SIA run joint venture airline Vistara operates to 18 domestic destinations.
An interline arrangement refers to a pact to issue and accept tickets for flights that are operated by the partner airline. When selling an interline ticket, the operating airline's own flight numbers are used.
"This exciting new partnership with Vistara will bring enhanced connectivity and increased convenience to our passengers travelling within India on an expanding full-service premium carrier. The Indian market is very important to us. This new partnership expands Qatar Airways' presence in India and reinforces our commitment to this market," Qatar Airways Group Chief Executive Akbar Al Baker said.
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Qatar Airways in the past had initiated talks with Indian budget carrier IndiGo for a marketing tie-up, which later failed to yield any results.
Qatar Airways operates services from Doha to New Delhi, Kochi, Ahmedabad, Amritsar, Bengaluru, Mumbai, Kozhikode, Kolkata, Goa, Hyderabad, Chennai, Nagpur and Thiruvananthapuram in India.