I used to travel ChennaiGuwahati very frequently. Most of the time I used to travel with Indigo. I would say their on time accuracy is almost 99%. Their flight timing is superb for Guwahati. Morning 5AM filght is there and you will reach Guwahati around 8AM clock. For me this is too good timing. Daily they have flight for Guwahati also including return flight. Their service on board is awesome. The airhostage also has some standard. I just love Indigio airleines. The leg space is OK.
Friends prefer Indigo do not fly with Spicejet.