Booking tickets for travel online is the biggest e-business currently and each and every (almost) operator has a online ticket booking portal or website.
Booking your ticket was never so easy as it is today. No need to travel to the agent and book your ticket book it online pay it online, print the ticket, pack the bags and you are ready to reach your destination.
Online bookings is not always successful and hence a note of caution is book early dont wait for the last minute.
Not all bus operators book tickets for all routes to and return. Pai travels still does not have a website (we atleast could not find one) but you could book a ticket of Pai travels from Pune to Belgaum only on Prassanna tours site.
Some sites do take an extra charge which is nominal but majority dont take any extra charge.
http://www.srsbooking.com/ – Belgaum to Bangalore
http://www.pvgtranslines.com/ – Belgaum to Pune, Mumbai & Bangalore
http://www.shantadurgatravels.com/ – Belgaum to Mumbai, Bangalore, Goa, Hyderabad, Goa, Pune
http://www.vrllogistics.in/newtrvl/ – All routes of VRL
http://ksrtc.in/ – All routes of KSRTC
http://www.redbus.in/ – All routes
http://www.kesinenitravels.com/ – Belgaum to Hyderabad
http://bustickets.makemytrip.com/ – All routes
http://www.hkbtours.in/ – Belgaum to Bangalore.
http://www.nationaltravels.in/ – Belgaum to Bangalore
http://www.ganeshtourists.com – Mangalore to Belgaum
http://www.konduskarsr.com/ – no direct bus to Belgaum only via Mumbai & Kolhapur
http://www.simplybus.com/ – All routes
http://184.108.40.206/purple/B2C/GetSchedulesB2C.aspx – Pai Travels Only Pune to Belgaum(no return ticket)
Hope this was of some use as holiday season is here….