The journey from Manali to Surat covers about 1700 km. The most practical way is to take a bus to Delhi and then a train or flight to Surat. Expect a total travel time of 40 to 45 hours by train.
Total Distance: 1700 km by road, 1400 km air distance.
Take the Paschim Express from Delhi for a direct train connection to Surat.
October to March for pleasant weather.