Bir-Billing is considered as the paragliding capital of the country and is supposedly the 2nd highest paragliding destination in Asia.
In this post one can find how a trip can be taken to Bir-Billing for 2 nights and 3 days starting from Delhi and I hope that this is informative enough.
The cheapest and the best way to reach Bir from Delhi are the Himachal Road Transport Corporation Volvo Buses that ply between Delhi ISBT Kashmere Gate and Bir, Himachal Pradesh.
My friend Barasha and I took a bus to Bir from Delhi ISBT which cost us around 1200INR each. We started from Delhi in the evening at around 7pm and reached Bir at around 7.30am the next day after a long 13 hour journey. (For people who have motion sickness, it is a good idea to carry a sickness bag and/or have a motion sickness medicine). The HRTC bus drops you in Bir main market, however, one can chose to alight at Chougan, which is a popular place for people to stay, has cheap accommodation.