The journey from Rajnagar to Chennai covers approximately 2100 km. The most practical way is to take a train from Darbhanga to Chennai Central. Alternatively, you can fly from Darbhanga to Chennai with a layover. This is a long-distance journey, so plan your transit in advance.
Total Distance: 2100 km driving distance, 1700 km straight-line air distance.
Carry enough food and water for this long journey.
November to February for pleasant weather in Chennai.