You can reach Mumbai to Delhi via flight or train. You can opt for a flight to Delhi which will cost you around Rs.3000-19000. It will take somewhere between 2-7 hours to reach Delhi. Once you reach Delhi you can take a bus to Manali which will take 15 hours to reach Manali. The cost would be somewhere around Rs.750-1800. You can even take a train to Delhi from Mumbai. It would take around 15 hours to reach Delhi The train tickets would cost you somewhere between Rs.250-2500. Once you reach Delhi you can take a bus to Manali. You can also take a flight to Chandigarh which will take about 3-5 hours to reach. Once you reach Chandigarh you can take a bus to Manali which will take 10 hours to reach. The ticket of the bus ranges from Rs.700-1400. Mumbai to Manali via air is the best option to reach.