| Slovenj Gradec to Oerlinghausen | 474.86 mi (764.21 km) |
| Slovenj Gradec to Oestrich-Winkel | 404.96 mi (651.73 km) |
| Slovenj Gradec to Offenburg | 359.83 mi (579.08 km) |
| Slovenj Gradec to Oftersheim | 359.59 mi (578.70 km) |
| Slovenj Gradec to Ohrdruf | 358.15 mi (576.38 km) |
| Slovenj Gradec to Ohringen | 318.40 mi (512.42 km) |
| Slovenj Gradec to Olbernhau | 298.10 mi (479.74 km) |
| Slovenj Gradec to Olching | 211.29 mi (340.04 km) |
| Slovenj Gradec to Oldenburg | 550.60 mi (886.10 km) |
| Slovenj Gradec to Oldenburg in Holstein | 568.85 mi (915.48 km) |
| Slovenj Gradec to Olfen | 500.07 mi (804.79 km) |
| Slovenj Gradec to Olpe | 453.36 mi (729.61 km) |
| Slovenj Gradec to Olsberg | 448.54 mi (721.85 km) |
| Slovenj Gradec to Oranienburg | 439.25 mi (706.91 km) |
| Slovenj Gradec to Ortenberg | 383.03 mi (616.43 km) |
