Efficient, well priced and useful for getting to or from the Vučedol Culture Museum if you don't have your own wheels. There's no central taxi stand so phone them for pick-up.
Osijek Airport is located 20km from Osijek on the road to Vukovar; it's a very minor airport with only a few Croatia Airlines flights to Dubrovnik and Zagreb.
The train station is to the east, at the opposite end of town to the bus station. Leave luggage at the train station's garderoba.
Vukovar's bus station has decent bus connections to nearby towns and to the capital as well as a couple of international services.
Buses arrive and depart from an unmarked car park at the bottom of Ilok's hill, an easy walk (back up the hill) to the museum.
The bus station lies just to the southwest of the town centre. You can leave your luggage at the garderoba.
From the train station it's a 1km walk straight up Frana Galovića to the Museum of the Krapina Neanderthal.
Osijek's bus station has good connections to local destinations and regular services to Zagreb.
Osijek's train station is located on Ulica Bartola Kašića, just south of the centre.