Kaunas Bus Station is a 15 minute walk from the centre of the city, and around 5 minutes from the Akropolis shopping mall. From this bus station you can get to almost everywhere in Lithuania. p.s. there is only one bus station in Kaunas.
It is served by many bus companies. There is tourism information centre inside the station. Buses to Vilnius are frequent. Leaving every 15-20 minutes(during the daytime) and the ticket is around 20 LTL(6€). P.s. Train to Vilnius would be cheaper and faster.
Check local routes at www.autobusubilietai.lt. International routes at www.ecolines.net and www.luxexpress.lt.
Mon-Su: 06:00-20:30