I am booking my flights regularly from ixigo.com only. this site provides THE CHEAPEST rate for flight for any routes in all over the India. I have booked like, pune to ahmedabad and return, pune to chennai and return, pune to bangalore and return for all routes. They have citrus cashback facility, so you will get the cheapest rate ever compared to any other online flight booking site or partner. only minus point is, it takes lots of days like 1-2-3 weeks for cashback to be credited in your account. other that that they are not cheaters atleast so nothing to worry for your cashback.
They provides good deals on hotel booking as well as on holiday package booking also. they have train and bus booking facilities also. So this is basically last stop for any of your booking related to travel or holiday.
Best option to choose. Try it once, you will come to know.
Very fast site, and cust support is good one too.