| Slovenj Gradec to Orbetello | 339.64 mi (546.60 km) |
| Slovenj Gradec to Oria | 434.43 mi (699.14 km) |
| Slovenj Gradec to Oristano | 560.75 mi (902.44 km) |
| Slovenj Gradec to Orta Nova | 359.18 mi (578.05 km) |
| Slovenj Gradec to Orte | 309.62 mi (498.28 km) |
| Slovenj Gradec to Ortona | 289.33 mi (465.63 km) |
| Slovenj Gradec to Orvieto | 299.84 mi (482.54 km) |
| Slovenj Gradec to Orzinuovi | 258.74 mi (416.40 km) |
| Slovenj Gradec to Osimo | 223.14 mi (359.10 km) |
| Slovenj Gradec to Ospitaletto | 248.96 mi (400.66 km) |
| Slovenj Gradec to Ostuni | 418.22 mi (673.06 km) |
| Slovenj Gradec to Ottaviano | 392.18 mi (631.15 km) |
| Slovenj Gradec to Ovada | 336.76 mi (541.95 km) |
| Slovenj Gradec to Ozieri | 509.70 mi (820.29 km) |
| Slovenj Gradec to Paceco | 603.04 mi (970.50 km) |
