Warsaw's main bus station, Dworzec PKS Zachodni, 10 minutes from Central Station on Bus 127 or 130, serves most long-distance routes, both domestic and international. Domestic buses headed east leave from Dworzec PKS Stadion on the east bank of the Vistula. The private long-distance bus service Polski Bus, which goes to most major destinations within Poland, arrives and departs from Jana Pawła II Station, between Central Station and the Holiday Inn. Polski Bus also has a stop at the airport. Polski Bus tickets can be bought only online (the website is available in English); book earlier for better prices.
Polski Bus. www.polskibus.com/en/index.htm.