Coimbatore to Delhi is a flight of approximately 3-5 hours. The flight would cost you somewhere between Rs.2500-7000. Once you are in Delhi you can take a bus from Manali which would take around 15 hours to reach. The bus tickets would cost you between Rs.750-1800. Other option can be you can opt for a train till Delhi. Train will take almost 40 hours to reach Delhi and then from Delhi you need to take a bus to Manali. The train tickets would be between Rs.750-3200. You even have an option of catching a flight to Chandigarh. It would take around 4 hours to reach Chandigarh. The flight tickets will be somewhere between Rs.3600-8000. Once you are in Chandigarh you can opt for a road trip via bus. The tickets are somewhere between Rs.750-1800. It will take almost 20 hours to reach Manali from Coimbatore.