| Oudenburg to Oria | 1,016.64 mi (1,636.12 km) |
| Oudenburg to Oristano | 824.23 mi (1,326.47 km) |
| Oudenburg to Orta Nova | 909.67 mi (1,463.97 km) |
| Oudenburg to Orte | 747.17 mi (1,202.45 km) |
| Oudenburg to Ortona | 812.73 mi (1,307.97 km) |
| Oudenburg to Orvieto | 724.57 mi (1,166.09 km) |
| Oudenburg to Orzinuovi | 510.66 mi (821.83 km) |
| Oudenburg to Osimo | 722.51 mi (1,162.76 km) |
| Oudenburg to Ospitaletto | 506.10 mi (814.49 km) |
| Oudenburg to Ostuni | 1,002.44 mi (1,613.26 km) |
| Oudenburg to Ottaviano | 899.46 mi (1,447.54 km) |
| Oudenburg to Ovada | 521.96 mi (840.02 km) |
| Oudenburg to Ozieri | 786.49 mi (1,265.73 km) |
| Oudenburg to Paceco | 1,024.00 mi (1,647.97 km) |
| Oudenburg to Pachino | 1,163.36 mi (1,872.24 km) |
