| Caltanissetta to Oria | 282.81 mi (455.14 km) |
| Caltanissetta to Oristano | 338.86 mi (545.33 km) |
| Caltanissetta to Orta Nova | 279.56 mi (449.90 km) |
| Caltanissetta to Orte | 354.66 mi (570.77 km) |
| Caltanissetta to Ortona | 336.25 mi (541.14 km) |
| Caltanissetta to Orvieto | 375.63 mi (604.52 km) |
| Caltanissetta to Orzinuovi | 586.65 mi (944.12 km) |
| Caltanissetta to Osimo | 415.19 mi (668.18 km) |
| Caltanissetta to Ospitaletto | 594.02 mi (955.98 km) |
| Caltanissetta to Ostuni | 292.92 mi (471.41 km) |
| Caltanissetta to Ottaviano | 233.19 mi (375.29 km) |
| Caltanissetta to Ovada | 568.52 mi (914.95 km) |
| Caltanissetta to Ozieri | 345.49 mi (556.01 km) |
| Caltanissetta to Paceco | 89.39 mi (143.86 km) |
| Caltanissetta to Pachino | 78.26 mi (125.96 km) |
