Here are a few suggestions for your next trip from Koper

In 3 hours, you can reach Liubliana, 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 Milán.

In 8 hours, you can reach Roma, Turín.

In 9 hours, you can reach Viena, Múnich, Linz.

In 10+ hours, you can reach Berlín, París, Budapest, Varsovia, Estocolmo, Praga, Bruselas, Ámsterdam, Bratislava, Zúrich...