We have three routes from Manali to Chandigarh. The best route is via national highway 3, which is the fastest. The distance between the places by this route is 343 kms. You should reach your destination in 9 hours.
The best season to visit Chandigarh is autumn, i.e., from mid-August to November, when the weather is neither very warm nor cold. It is a pleasant and favorable for a city tour. Winters, i.e. November to February are extreme in Chandigarh as thick fog settles in the air, and the temperature goes down to sub-zero level. However, it is also season for the much awaited Chandigarh carnival held every year in the month of Novemeber. Another festival in the winter season is the Festival of Gardens held in February. This festival is ac three-day event which is filled with various dances, music and various other activities that highlight the cities culture. During the summers i.e.,from mid-March to June months, the heat is scorching as the temperature rises above the 40 degree C. Monsoon showers do bring some relief in the month of July, bringing down the temperatures though the humidity levels remain high.
There are two alternative routes. One route is via NH3 and NH 154. This route is about 290 kms but due to roadblocks,, often takes more time. The third route is via NH3 and Una - Jahu - Nerchowk Rd. This is the longest route of the three. It is about 360 kms and takes 10 hours to cover the distance.
The roads like any other mountain terrain are steep and full of curves. However, with professional cab services there is nothing to worry about. Book a cab and enjoy your road trip.