| Oud-Heverlee to Novi di Modena | 501.55 mi (807.17 km) |
| Oud-Heverlee to Novi Ligure | 460.99 mi (741.89 km) |
| Oud-Heverlee to Nuoro | 760.47 mi (1,223.86 km) |
| Oud-Heverlee to Occhiobello | 518.67 mi (834.72 km) |
| Oud-Heverlee to Oderzo | 500.71 mi (805.81 km) |
| Oud-Heverlee to Oggiono | 409.77 mi (659.46 km) |
| Oud-Heverlee to Olbia | 723.14 mi (1,163.78 km) |
| Oud-Heverlee to Oleggio | 404.94 mi (651.68 km) |
| Oud-Heverlee to Olgiate Comasco | 400.83 mi (645.07 km) |
| Oud-Heverlee to Olgiate Olona | 408.18 mi (656.91 km) |
| Oud-Heverlee to Omegna | 382.90 mi (616.22 km) |
| Oud-Heverlee to Opera | 430.92 mi (693.50 km) |
| Oud-Heverlee to Oppeano | 486.12 mi (782.33 km) |
| Oud-Heverlee to Orbassano | 423.82 mi (682.08 km) |
| Oud-Heverlee to Orbetello | 657.25 mi (1,057.75 km) |
