CTM Point is the public transport company operating in Cagliari and in the surrounding municipalities . Tickets may be purchased at tobacconists, at newsstands and at CTM points. You can buy the ticket on board with a supplement of 0,50 EUR. Children under 6 travel free.
CTM BusFinder is the free app you can install on your smart phone.
In a part of Cagliari the Metrocagliari is available.
A ticket is valid for 90 minutes (2 hours with Metrocagliari). Daily tickets are valid until midnight.