| Ganshoren to Oignies | 64.12 mi (103.19 km) |
| Ganshoren to Oissel | 177.54 mi (285.72 km) |
| Ganshoren to Olivet | 234.20 mi (376.91 km) |
| Ganshoren to Ollioules | 538.72 mi (866.98 km) |
| Ganshoren to Olonne-sur-Mer | 407.94 mi (656.52 km) |
| Ganshoren to Oloron-Sainte-Marie | 578.28 mi (930.66 km) |
| Ganshoren to Onet Village | 456.26 mi (734.28 km) |
| Ganshoren to Onnaing | 45.68 mi (73.52 km) |
| Ganshoren to Orange | 465.45 mi (749.08 km) |
| Ganshoren to Orchies | 54.21 mi (87.25 km) |
| Ganshoren to Orleans | 231.64 mi (372.80 km) |
| Ganshoren to Orly | 169.90 mi (273.44 km) |
| Ganshoren to Ormesson-sur-Marne | 164.17 mi (264.20 km) |
| Ganshoren to Orsay | 177.39 mi (285.48 km) |
| Ganshoren to Orthez | 562.69 mi (905.57 km) |
