The airlines, which operates two daily flights between the national capital and the South East Asian nation with Boeing 777 aircraft, would operate the third one also with Boeing 777 plane from the winter schedule, a statement from the airline said.
The winter schedule is likely to come into effect from October 27 and continues till March 29 next year.
SIA had been operating 14 weekly flights from Delhi.
The airline currently operates 56 weekly flights from six cities, while SilkAir - the regional wing of SIA and also a full-service carrier - operates 42 weekly flights from eight cities in India.
"From October 27, Singapore Airlines and SilkAir will operate a total of 107 weekly flights to 11 destinations - Ahmedabad, Bangalore, Chennai, Coimbatore, Hyderabad, Kochi, Kolkata, Mumbai, New Delhi, Thiruvananthapuram and Visakhapatnam - in India," the statement said.