Formerly PolskiBus, Flixbus have enjoyed great success in recent years, thanks to their investment in a modern fleet of luxury red coaches which come with convenient connections, free coffee and free (generally good) WiFi. They now offer connections with 174 destinations in Poland and, more recently, the rest of the Flixbus network in Europe. Coaches depart from Gdańsk Główny Bus Station (Dworzec PKS). Check their website for routes and timetable.