Here are a few suggestions for your next trip from Köln-Mülheim

In 2 hours, you can reach Köln, Düsseldorf, Essen, Liège, Frankfurt am Main, Nijmegen, Leuven, Dortmund, Arnhem.

In 3 hours, you can reach Brussels, Amsterdam, Antwerpen, Utrecht, Stuttgart, Eindhoven, Anderlecht, Tilburg, Schaerbeek, Namur...

In 4 hours, you can reach Luxembourg, Paris, Rotterdam, Hamburg, The Hague, Gent, Charleroi, Strasbourg.