Here are a few suggestions for your next trip from Trieste

In 3 hours, you can reach Lubiana, Fiume.

In 4 hours, you can reach Milano, Kranj.

In 5 hours, you can reach Maribor.

In 6 hours, you can reach Roma, Zagabria.

In 7 hours, you can reach Graz, Napoli, Linz.

In 8 hours, you can reach Vienna, Zurigo, Monaco.

In 9 hours, you can reach Bratislava, Brno, Ginevra, Lione, Basilea.

In 10+ hours, you can reach Berlino, Parigi, Bucarest, Budapest, Varsavia, Stoccolma, Praga, Bruxelles, Amsterdam, Schaan...