| Oud-Heverlee to Olivenza | 1,015.98 mi (1,635.07 km) |
| Oud-Heverlee to Olot | 606.56 mi (976.17 km) |
| Oud-Heverlee to Onate | 633.47 mi (1,019.48 km) |
| Oud-Heverlee to Onda | 787.81 mi (1,267.87 km) |
| Oud-Heverlee to Onteniente | 868.62 mi (1,397.91 km) |
| Oud-Heverlee to Orihuela | 922.58 mi (1,484.74 km) |
| Oud-Heverlee to Osuna | 1,055.39 mi (1,698.49 km) |
| Oud-Heverlee to Ourense | 833.74 mi (1,341.77 km) |
| Oud-Heverlee to Oviedo | 713.56 mi (1,148.36 km) |
| Oud-Heverlee to Paiporta | 825.60 mi (1,328.67 km) |
| Oud-Heverlee to Pajara | 1,835.34 mi (2,953.70 km) |
| Oud-Heverlee to Palafolls | 639.70 mi (1,029.50 km) |
| Oud-Heverlee to Palafrugell | 620.15 mi (998.03 km) |
| Oud-Heverlee to Palamos | 625.26 mi (1,006.25 km) |
| Oud-Heverlee to Palencia | 749.14 mi (1,205.63 km) |
