Welcome to flyertalk, praveen. I would avoid booking on Kingfisher for the foreseeable future unless you have no other reasonable alternatives.
One caveat about booking on Jetlite (S2) in your case is that they will not honor the baggage allowance for international passengers unless the entire trip is booked on the same PNR. So in your case, you may be asked to pay excess baggage charges if your checked luggage exceeds the domestic allowance (20 kg).
On the other hand, Kingfisher seems to honor the baggage allowance of the international carrier (though I have not read any recent reports of this).
I would give thought to train or car options for the relatively short trip BLR-CJB.