| Ariano Irpino to Oria | 140.46 mi (226.05 km) |
| Ariano Irpino to Oristano | 351.83 mi (566.21 km) |
| Ariano Irpino to Orta Nova | 34.60 mi (55.68 km) |
| Ariano Irpino to Orte | 165.93 mi (267.04 km) |
| Ariano Irpino to Ortona | 90.02 mi (144.87 km) |
| Ariano Irpino to Orvieto | 187.43 mi (301.64 km) |
| Ariano Irpino to Orzinuovi | 391.46 mi (629.99 km) |
| Ariano Irpino to Osimo | 180.70 mi (290.81 km) |
| Ariano Irpino to Ospitaletto | 394.83 mi (635.41 km) |
| Ariano Irpino to Ostuni | 133.37 mi (214.63 km) |
| Ariano Irpino to Ottaviano | 38.13 mi (61.37 km) |
| Ariano Irpino to Ovada | 405.21 mi (652.13 km) |
| Ariano Irpino to Ozieri | 320.31 mi (515.49 km) |
| Ariano Irpino to Paceco | 257.35 mi (414.16 km) |
| Ariano Irpino to Pachino | 306.51 mi (493.27 km) |
