| Hoeilaart to Novi di Modena | 503.33 mi (810.02 km) |
| Hoeilaart to Novi Ligure | 460.81 mi (741.60 km) |
| Hoeilaart to Nuoro | 759.03 mi (1,221.55 km) |
| Hoeilaart to Occhiobello | 520.99 mi (838.45 km) |
| Hoeilaart to Oderzo | 504.35 mi (811.67 km) |
| Hoeilaart to Oggiono | 410.87 mi (661.23 km) |
| Hoeilaart to Olbia | 721.97 mi (1,161.90 km) |
| Hoeilaart to Oleggio | 405.16 mi (652.04 km) |
| Hoeilaart to Olgiate Comasco | 401.54 mi (646.22 km) |
| Hoeilaart to Olgiate Olona | 408.69 mi (657.72 km) |
| Hoeilaart to Omegna | 383.09 mi (616.52 km) |
| Hoeilaart to Opera | 431.57 mi (694.55 km) |
| Hoeilaart to Oppeano | 488.43 mi (786.05 km) |
| Hoeilaart to Orbassano | 422.50 mi (679.95 km) |
| Hoeilaart to Orbetello | 657.83 mi (1,058.67 km) |
