Serbia in detail
Belgrade Nikola Tesla Airport A taxi to central Belgrade (18km) should cost around 1800RSD. Local bus 72 (89RSD to 150RSD) and A1 minibus (300RSD) connect the airport to town.
Niš Constantine the Great Airport Public bus 34A (60RSD, 10 minutes) will take you to town. A cab should cost around 400RSD.