Buying a bus ticket in Chile can be difficult, unless you know the correct place to go. And going to the bus station in small towns in Chile may not work, as they have varying hours of operation. Luckily, there is a new company started in January 2015:
Unlike the other bus websites such as Thaebus.cl or Turbus.cl, Recorrido.cl allows the input of your Passport number, instead of the Chilean RUT number. Recorrido also allows you to pay for a bus ticket through Paypal.
One thing to remember is that you do need to be able to print your ticket to bring with you to where the bus picks you up, (which may look to you like the middle of the road)! Remember this, because they will not accept electronic tickets.
The other way that works is to go to the station during their operating hours and purchase a ticket there. In Santiago, this worked for me at Alameda Station. I was able to select my seat, and purchase the ticket with my credit card.
There you go! If you know of another way to purchase bus tickets in Chile, please leave a comment below!