APSRTC is one of the most reliable bus services plying within and outside of Andhra Pradesh. Their buses connect passengers from AP to neighboring states like Karnataka, Tamil Nadu, Orissa, Maharashtra, Goa and the union territory of Pondicherry. Bus tickets reservation for APSRTC is not available online as of now. APSRTC bus booking can be done through any of their certified agents.
Online bus tickets reservations facilities can be achieve on redBus site
Every one can book bus tickets online for reliable private bus operators like Dhanunjaya Travels, Diwakar Travels, Kesineni Travels and Sree Kaleswari Travels  among many other bus operators that ply on various routes.
For online booking visit below given link
for online redBus.in