Here are a few suggestions for your next trip from Koszalin

In 4 hours, you can reach Poznaň.

In 5 hours, you can reach Berlín, Vratislav.

In 6 hours, you can reach Varšava.

In 7 hours, you can reach Hamburk, Łódź.

In 8 hours, you can reach Krakov, Ostrava.

In 9 hours, you can reach Praha, Mnichov, Frankfurt nad Mohanem.

In 10+ hours, you can reach Paříž, Budapešť, Vídeň, Stockholm, Kodaň, Brusel, Amsterdam, Vilnius, Bratislava, Curych...