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 Varsovie.

In 7 hours, you can reach Hambourg, Łódź.

In 8 hours, you can reach Cracovie, Ostrava.

In 9 hours, you can reach Prague, Munich, Francfort.

In 10+ hours, you can reach Paris, Budapest, Vienne, Stockholm, Copenhague, Bruxelles, Amsterdam, Vilnius, Bratislava, Zurich...