It is a good idea to travel to Karnataka, keeping in mind that it is often overlooked in favour of other popular destinations such as Kerala, Goa and Tamil Nadu. You can get domestic flight offers to Bangalore which is a popular place in Karnataka but a lot similar to Delhi. I have seen musafir india portal, domestic flight section giving very relevant information regarding domestic flight offers.
If you want to stay clear of a metropolitan city, then you can consider going to places like Coorg, Gokarna, Hampi, Mangalore, Badami, Agumbe, Karwar, Jog Falls, and several others.
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