Düsseldorf Airport, known as Düsseldorf International Airport until March 2013, is an international airport serving Düsseldorf and Rhine-Ruhr area, the capital of the German state of North Rhine-Westphalia and the largest urban aggression of Germany. It is about 7 kilometres north of downtown Düsseldorf and some 30 kilometres southwest of Essen and about 15 kilometres south of Duisburg in the Rhine-Ruhr area, Germany's largest metropolitan area.