Amritsar-Dehradun Express Amritsar Dehradun
4163 Sangam Express Allahabad Dehradun
9019 Bandra-Dehradun Express Bandra Terminus (Mumbai), Nizamuddin (Delhi) Dehradun
Bus
Delux, Volvo, Semi-deluxe and ordinary Uttarakhand State buses depart every hour from ISBT, Kashmere Gate in New Delhi. There is also an overnight deluxe A/C service run by Uttarakhand Tourism. It is a six to seven hour journey from Delhi. However, the bus station is located about 5-6 km from the centre of the town. If you are coming from Delhi side the trains will generally be more convenient.
Car
Dehradun is in principle a 5 hour drive from Delhi, but unless you leave Delhi very early in the morning, you will encounter traffic that makes the trip significantly longer. The town is on NH 72A (Chhutmalpur to Dehradun). The road is two-laned, but not very wide. There may be many slow-moving vehicles at harvest times, and pilgrims walking on the road in late July and early August
