Kolkata is the capital of West Bengal. To reach it from Khatra, you can take a bus to Bankura and then a train to Kolkata (Howrah/Sealdah). The distance is approximately 250 km. The journey takes about 6 to 8 hours.
Total Distance: 250 km driving distance, 200 km air distance.
Trains from Bankura are very reliable.
October to March.