Hey Abhinav, If you fly from Bali to India, the cheapest tickets will cost you on an average Rs.15,000 round trip if you are traveling from Kochi. It also depends on how much in advance you book your tickets. The hotels will cost you an average of Rs.4000 for a night whereas a home stay will cost you around Rs.3500 a night. Also, expect to spend anywhere between 800 to 3000 a day on local transport and other activities.
It will cost you around 50-60 thousand for a 5-6 day trip to Bali. Usually flights are expensive . If you get good deal on flights , it can turn out to be reasonable deal
Hotel : 20000 for 5 night
Sightseeing and food : 10000