During summer season there is a daily bus from Split to Bern, during winter season the bus runs several times weekly. From Split the bus departure from the main bus station, which is next to the ferry port and the train station in the centre of town. The bus travel time is about 22 hours. If you wish to travel outside of the main season, and the weekly departures does not match your travel plans, you can take bus from Split to Zagreb, from there on you have daily bus to Bern, you can see timetable for that bus here.