| Hoeilaart to Oignies | 67.77 mi (109.07 km) |
| Hoeilaart to Oissel | 179.17 mi (288.35 km) |
| Hoeilaart to Olivet | 231.45 mi (372.48 km) |
| Hoeilaart to Ollioules | 530.97 mi (854.52 km) |
| Hoeilaart to Olonne-sur-Mer | 407.84 mi (656.35 km) |
| Hoeilaart to Oloron-Sainte-Marie | 574.94 mi (925.27 km) |
| Hoeilaart to Onet Village | 450.77 mi (725.45 km) |
| Hoeilaart to Onnaing | 46.24 mi (74.41 km) |
| Hoeilaart to Orange | 458.26 mi (737.49 km) |
| Hoeilaart to Orchies | 57.26 mi (92.15 km) |
| Hoeilaart to Orleans | 228.93 mi (368.43 km) |
| Hoeilaart to Orly | 167.63 mi (269.77 km) |
| Hoeilaart to Ormesson-sur-Marne | 161.65 mi (260.16 km) |
| Hoeilaart to Orsay | 175.45 mi (282.36 km) |
| Hoeilaart to Orthez | 559.59 mi (900.57 km) |
