The journey from Khanna to Kochi spans about 2700 km. The most practical way to travel is by train, usually involving a connection at Delhi. You will cross the entire length of India. Expect a travel time of approximately 50 to 54 hours.
Total Distance: 2700 km by road, 2300 km air distance.
This is a very long journey; plan accordingly.
October to March for pleasant weather.