| Boortmeerbeek to Oignies | 77.43 mi (124.61 km) |
| Boortmeerbeek to Oissel | 191.08 mi (307.51 km) |
| Boortmeerbeek to Olivet | 246.56 mi (396.80 km) |
| Boortmeerbeek to Ollioules | 545.28 mi (877.54 km) |
| Boortmeerbeek to Olonne-sur-Mer | 421.35 mi (678.10 km) |
| Boortmeerbeek to Oloron-Sainte-Marie | 590.28 mi (949.97 km) |
| Boortmeerbeek to Onet Village | 466.32 mi (750.46 km) |
| Boortmeerbeek to Onnaing | 59.08 mi (95.08 km) |
| Boortmeerbeek to Orange | 473.08 mi (761.35 km) |
| Boortmeerbeek to Orchies | 67.68 mi (108.92 km) |
| Boortmeerbeek to Orleans | 244.02 mi (392.72 km) |
| Boortmeerbeek to Orly | 182.51 mi (293.71 km) |
| Boortmeerbeek to Ormesson-sur-Marne | 176.64 mi (284.28 km) |
| Boortmeerbeek to Orsay | 190.16 mi (306.03 km) |
| Boortmeerbeek to Orthez | 574.86 mi (925.14 km) |
