Hi,

You are Indian? why you thinking too-much?
Sure Air-India is cheaper than other from India. but i thing Air-India is no direct service from Chennai.
check http://www.airindiaexpress.in/

Air Arabia is cheaper also , I thing 8000-12000 INR.

or you can choose Qatar Airways

http://www.qatarairways.com/qa/en/homepage.page#

the cost will depends on the date. in this session i thing it will come Qatar airways 20000-30000 INR.

or emirates
http://www.emirates.com/