Travel by Car: The driving distance between Dusseldorf and Mostar is 1.620 km, with estimated travel time of 15 hours. Fastest route goes via highway in Croatia, Slovenia and Austria where tool fees apply. The route also goes via highway in Germany but there is free of charge.
Alternative ways of travelling from Mostar to Düsseldorf:
Travel by train: From Mostar there is a possibility to travel by train to Zagreb (via Sarajevo), and then continue with international train to Dusseldorf (the train goes via Munchen). Travelling by train in Bosnia and Herzegovina and Croatia is relatively slow, so travelling time in total is much longer compared to travel by bus or car. More information about travelling by trains in Bosnia and Herzegovina you can see here.
Travel by plane: There is no direct flight from Mostar to Dusseldorf, but there is an option to fly from Split in Croatia to Cologne in Germany.
Map with buses from Mostar: