| Slovenj Gradec to Oberkirch | 354.95 mi (571.23 km) |
| Slovenj Gradec to Obernburg am Main | 357.31 mi (575.03 km) |
| Slovenj Gradec to Obernkirchen | 479.34 mi (771.42 km) |
| Slovenj Gradec to Oberschleissheim | 203.61 mi (327.67 km) |
| Slovenj Gradec to Oberstdorf | 234.70 mi (377.72 km) |
| Slovenj Gradec to Obertraubling | 217.03 mi (349.28 km) |
| Slovenj Gradec to Obertshausen | 377.75 mi (607.92 km) |
| Slovenj Gradec to Oberursel | 392.51 mi (631.68 km) |
| Slovenj Gradec to Ochsenfurt | 317.08 mi (510.30 km) |
| Slovenj Gradec to Ochsenhausen | 263.53 mi (424.11 km) |
| Slovenj Gradec to Ochtrup | 529.43 mi (852.04 km) |
| Slovenj Gradec to Odenthal | 478.24 mi (769.66 km) |
| Slovenj Gradec to Oelde | 482.56 mi (776.61 km) |
| Slovenj Gradec to Oelsnitz | 301.09 mi (484.55 km) |
| Slovenj Gradec to Oer-Erkenschwick | 500.78 mi (805.93 km) |
