"Srilankan Airlines has observed a drop in traffic between Chennai and Colombo due to recent developments in Tamil Nadu, hence it was decided to reduce its frequency of flights to Chennai from 28 to 14 per week," a statement from the airline said today.
Revised schedule involves two daily flights in the morning and evening, the airline said.
Meanwhile, the ministry of external affairs said it had lodged "strong protests" with the Indian government on the incidents of assaults on Buddhists in Tamil Nadu.
The attacks came ahead of a crucial vote at the ongoing UNHRC session in Geneva where a US-backed resolution is expected to be adopted on Sri Lanka's accountability and reconciliation progress since the end of the three-decade long civil war in 2009.