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 Varșovia.

In 7 hours, you can reach Hamburg, Łódź.

In 8 hours, you can reach Cracovia, Ostrava.

In 9 hours, you can reach Praga, München, Frankfurt pe Main.

In 10+ hours, you can reach Paris, Budapesta, Viena, Stockholm, Copenhaga, Bruxelles, Amsterdam, Vilnius, Bratislava, Zürich...