The bus company in San Sebastian is called «Dbus«
You can choose two different ways of payment:
1) The regular ticket costs 1.65€ and you pay it once on the bus. Using the MUGI card each bus ride costs 0,91€.
2) With a Lurralde bus card
The buses that you will use the most will be:
Line 5 (Benta Berri) From the University to the Center of the city, every 6 minutes until 22:30.
Line 24 (Altza-Antiguo) To Gros and Amara, every 30 minutes at fifteen to the hour and fifteen after the hour until 19:45.
Line 25 (Añorga) To the center of the city every 20 minutes until 22:00.
Line 27 (Intxaurrondo-Antiguo-Gros) To Amara and Egia, every 30 minutes on the hour, and on the half hour until 19:30.
Line 33 (Larratxo-Intxaurrondo-Antiguo-Berio) To Gros through the Center of the city every 30 minutes until 22:00.
Line 40 (Gros- Antiguo- Igara) To Gros through the Center every 30 minutes until 22.00.