The Eivissa Island has services of public bus that cover all the paths. There are several companies dedicated to this purpose. The intercity stop The city of Ibiza is located on Avenida de Isidoro Macabich, 44.
The Schedule Winter are daytime, between 6 and 11:30 p.m., approximately. In summer the schedule is extended with the service of Discobus, which runs all night in some lines. Also the frequencies multiply in these months.
I leave you a website where you can find particular information of each line. www.ibizabus.com
The tariffs of the island’s buses range between € 1.45 and € 1.80. You can buy a bonobus It will save you around 30% on each trip.