You can take a flight from Trivandrum to Delhi which will take around 3-4 hours to reach. The cost would be somewhere between Rs.4800-9000. Once you reach Delhi you can take a bus to Manali which will take around 15 hours to reach. The cost of the tickets would be somewhere between Rs.750-1800. You can even take a train to Delhi. It will almost 2 days to reach Delhi. The tickets would cost you between Rs.250-3500. You can take a flight to Chandigarh it will take almost 7 hours to reach Chandigarh. The cost would be somewhere between Rs.7000-10000. Once you reach Chandigarh you can take a bus to Manali which will take 10 hours to reach. The cost of the bus ticket would be Rs.700-1400. Best travel plan for Trivandrum to Manalii is via flight mode.