Flights, trains and buses are not available directly to Manali from Gurgaon. You have to choose train directly to Chandigarh and then choose bus for the Manali destination. The total time taken in travel is around 15 hours. The distance between Manali from Gurgaon is 577 Km. You can also go through New Delhi and Ambala Cantt. All these paths are taking similar times that you can choose according to your convenience.
