| Ostend to Oignies | 52.38 mi (84.29 km) |
| Ostend to Oissel | 153.14 mi (246.46 km) |
| Ostend to Olivet | 236.73 mi (380.97 km) |
| Ostend to Ollioules | 575.26 mi (925.79 km) |
| Ostend to Olonne-sur-Mer | 387.70 mi (623.94 km) |
| Ostend to Oloron-Sainte-Marie | 578.90 mi (931.66 km) |
| Ostend to Onet Village | 474.23 mi (763.21 km) |
| Ostend to Onnaing | 65.04 mi (104.68 km) |
| Ostend to Orange | 497.48 mi (800.62 km) |
| Ostend to Orchies | 53.80 mi (86.57 km) |
| Ostend to Orleans | 234.03 mi (376.64 km) |
| Ostend to Orly | 173.07 mi (278.53 km) |
| Ostend to Ormesson-sur-Marne | 169.43 mi (272.68 km) |
| Ostend to Orsay | 177.65 mi (285.90 km) |
| Ostend to Orthez | 561.64 mi (903.88 km) |
