Travel by car: the driving distance between Paris and Mostar is 1850 km which equals a travelling time of approximately 17 hours. There is option to go via route trough Italy or Germany. Driving distance in both option is approximately the same, but in Germany highway is free of charge.
Alternative ways of travelling from Paris to Sarajevo:
Travel by train: on this route it is possible to travel by train; it is necessary to change trains in Munich and then in Zagreb to Mostar. More info on trains in Bosnia can be found here.
Travel by plane: there are no direct flights on this route.
Map with buses from Mostar: