Here are a few suggestions for your next trip from Koszalin

In 4 hours, you can reach Posen.

In 5 hours, you can reach Berlino, Breslavia.

In 6 hours, you can reach Varsavia.

In 7 hours, you can reach Amburgo, Łódź.

In 8 hours, you can reach Cracovia, Ostrava.

In 9 hours, you can reach Praga, Monaco, Francoforte sul Meno.

In 10+ hours, you can reach Parigi, Budapest, Vienna, Stoccolma, Copenaghen, Bruxelles, Amsterdam, Vilnius, Bratislava, Zurigo...