Here are a few suggestions for your next trip from Koszalin

In 4 hours, you can reach Poznań.

In 5 hours, you can reach Berlin, Wrocław.

In 6 hours, you can reach Warszawa.

In 7 hours, you can reach Hamburg, Łódź.

In 8 hours, you can reach Kraków, Ostrawa.

In 9 hours, you can reach Praga, Monachium, Frankfurt nad Menem.

In 10+ hours, you can reach Paryż, Budapeszt, Wiedeń, Sztokholm, Kopenhaga, Bruksela, Amsterdam, Wilno, Bratysława, Zurych...