Recently I came across Jagson Airlines website.
Jagson flies to Shimla, Dharamshala(Guggal Airport of kangra) and Kullu Manali.
Actually Jagson is main flier in HP.
Here is their website and more info:
Delhi Jagson Airlines ltd.
3rd Floor,Vandana Building,
11-Tolstoy Marg, New Delhi-110001
23721593, 23721594, 23328579,23328580,
Delhi airport Jagson Airlines ltd.
191 Airport,Terminal - 1B, Palam Airport,
Fare and time schedule is also published on the website.