| Willebroek to Oignies | 72.83 mi (117.21 km) |
| Willebroek to Oissel | 187.54 mi (301.81 km) |
| Willebroek to Olivet | 247.42 mi (398.18 km) |
| Willebroek to Ollioules | 552.10 mi (888.52 km) |
| Willebroek to Olonne-sur-Mer | 419.30 mi (674.81 km) |
| Willebroek to Oloron-Sainte-Marie | 591.71 mi (952.26 km) |
| Willebroek to Onet Village | 470.24 mi (756.78 km) |
| Willebroek to Onnaing | 57.71 mi (92.87 km) |
| Willebroek to Orange | 479.15 mi (771.11 km) |
| Willebroek to Orchies | 63.86 mi (102.78 km) |
| Willebroek to Orleans | 244.85 mi (394.04 km) |
| Willebroek to Orly | 182.94 mi (294.41 km) |
| Willebroek to Ormesson-sur-Marne | 177.33 mi (285.38 km) |
| Willebroek to Orsay | 190.23 mi (306.15 km) |
| Willebroek to Orthez | 576.01 mi (926.99 km) |
