Here are a few suggestions for your next trip from Trieste

In 3 hours, you can reach Ljubljana, Rijeka.

In 4 hours, you can reach Milan, Kranj.

In 5 hours, you can reach Maribor.

In 6 hours, you can reach Rome, Zagreb.

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

In 8 hours, you can reach Vienna, Zürich, Munich.

In 9 hours, you can reach Bratislava, Brno, Genève, Lyon, Basel.

In 10+ hours, you can reach Berlin, Paris, Bucharest, Budapest, Warsaw, Stockholm, Prague, Brussels, Amsterdam, Schaan...