Here are a few suggestions for your next trip from Koper

In 3 hours, you can reach Ljubljana.

In 4 hours, you can reach Rijeka, Kranj, Celje.

In 5 hours, you can reach Zagreb, Maribor.

In 6 hours, you can reach Sesvete.

In 7 hours, you can reach Milan, Graz.

In 8 hours, you can reach Rome, Turin.

In 9 hours, you can reach Vienna, Munich, Naples, Linz, Genoa.

In 10+ hours, you can reach Berlin, Paris, Budapest, Prague, Bratislava, Zürich, Schaan, Hamburg, Brno, Geneva...