Here are a few suggestions for your next trip from Keulen

In 2 hours, you can reach Brussel.

In 3 hours, you can reach Amsterdam, Antwerpen.

In 4 hours, you can reach Parijs, Luxemburg, Hamburg, Rotterdam.

In 5 hours, you can reach Londen, Berlijn, Zürich, Esch-sur-Alzette.

In 7 hours, you can reach Schaan, Vaduz.

In 8 hours, you can reach Wenen, Praag, Birmingham, Marseille, Genève.

In 9 hours, you can reach Kopenhagen, Bratislava, Milaan, Århus.

In 10+ hours, you can reach Madrid, Rome, Boekarest, Boedapest, Warschau, Stockholm, Dublin, Zagreb, Ljubljana, Monaco...