All PID tickets can be acquired in the following way
A list of tickets with their respective prices can be found in a following article.
Ticket vending machines are installed at all metro stations and at selected surface transit stops. Choose a ticket by pressing the respective button. By pressing the button repeatedly you can buy more tickets at once. If you want to buy a discounted ticket or a ticket for luggage or a dog, press the DISCOUNTED button prior to making your selection. When you are finished, insert the correct amount of money and take your tickets and change.
The vending machines accept only coins, not banknotes. Some busy places (e.g. Airport, Main train station) are equipped with machines that accept cards as well.
If you don’t have the necessary ticket when entering the bus, you can purchase it without extra charge directly from the driver. The easiest way to purchase a ticket is to tell the driver the name of your destination stop. A ticket purchased from a suburban bus driver does not need to be validated, it is valid immediately. Do not forget to take your ticket from the driver and to keep it for your entire trip for a potential ticket inspection. It is possible to transfer to another line with the purchased ticket, but only within the ticket’s time and zone validity.
This applies only to suburban lines, on urban lines the purchase is charged by a higher price.
You can buy tickets for Prague integrated transport in a mobile app “PID Lítačka” which is available for download in Google/Apple Store. You pay for the ticket via credit/debit card. Before you use the ticket, you need to activate it in the application. The validity of the ticket starts two minutes after the validation. Since then you can use the ticket, so remember to activate the ticket in advance.