Here are a few suggestions for your next trip from Słupsk

In 5 hours, you can reach Warsaw, Poznań.

In 6 hours, you can reach Berlin, Łódź, Wrocław.

In 7 hours, you can reach Kraków.

In 8 hours, you can reach Hamburg.

In 9 hours, you can reach Ostrava.

In 10+ hours, you can reach Paris, Budapest, Vienna, Stockholm, Prague, Copenhagen, Brussels, Amsterdam, Vilnius, Bratislava...