Travel by Car: The driving distance between Ljubljana and Mostar following fastest route is 575 km, within the estimated travel time of 6 hours. Recommended route goes in Croatia via highway where tool fees apply. There is also possibility to travel with local roads, but travel time will be much longer.
Travel by Bus: Timetable and price tickets for buses from Ljubljana to Mostar you can check here. Alternatively it is possible to travel via Sarajevo or Zagreb in Croatia.
Alternative ways of travelling from Mostar to Ljubljana:
Travel by train: From Mostar there is a train to Sarajevo, which have several international connection e.g. to Zagreb in Croatia. From Zagreb in Croatia there is a direct train to Ljubljana, Slovenia. More information about train in Bosnia and Herzegovina you can check here.
Travel by plane: There is no direct flight.
Map with buses from Mostar: