Bus travel from National park Krka to Lucerne in Switzerland, how to! As there is no direct end to end bus, you will have first to travel from Krka to Sibenik, which can be done from Skradin where there is local buses driving, from Sibenik you then have bus to Lucerne, during summer the bus drives daily, during winter season not every day. timetable from Sibenik to Lucerne you can see below. If you need to travel in the off peak season and the departure days does not match your schedule, you can travel from NP Krka or Sibenik to Zagreb, and then catch the daily bus to Lucerne from there on.