The journey from Chadayamangalam to Patna is a massive 2500 km trek across India. You must reach Kollam Junction for rail connectivity. This route takes you from the southern tip of India to the heart of Bihar. Given the distance, flying is highly recommended for time efficiency. Patna is a historic city on the banks of the Ganges.
Total Distance: 2500 km by road, 2100 km air distance.
This is a long journey; plan for multiple train changes.
October to March for pleasant weather.