Here are a few suggestions for your next trip from Koper

In 3 hours, you can reach Ljubljana, Rijeka.

In 4 hours, you can reach Kranj, Celje.

In 5 hours, you can reach Maribor.

In 6 hours, you can reach Zagreb, Graz.

In 7 hours, you can reach Milaan.

In 8 hours, you can reach Rome, Turijn.

In 9 hours, you can reach Wenen, München, Linz.

In 10+ hours, you can reach Berlijn, Parijs, Boedapest, Warschau, Stockholm, Praag, Brussel, Amsterdam, Bratislava, Zürich...