| Middelkerke to Olivenza | 988.53 mi (1,590.88 km) |
| Middelkerke to Olot | 622.21 mi (1,001.35 km) |
| Middelkerke to Onate | 614.28 mi (988.60 km) |
| Middelkerke to Onda | 789.40 mi (1,270.41 km) |
| Middelkerke to Onteniente | 870.16 mi (1,400.39 km) |
| Middelkerke to Orihuela | 923.49 mi (1,486.21 km) |
| Middelkerke to Osuna | 1,039.22 mi (1,672.46 km) |
| Middelkerke to Ourense | 791.70 mi (1,274.12 km) |
| Middelkerke to Oviedo | 675.24 mi (1,086.69 km) |
| Middelkerke to Paiporta | 827.20 mi (1,331.25 km) |
| Middelkerke to Pajara | 1,805.82 mi (2,906.18 km) |
| Middelkerke to Palafolls | 657.47 mi (1,058.09 km) |
| Middelkerke to Palafrugell | 640.51 mi (1,030.81 km) |
| Middelkerke to Palamos | 645.42 mi (1,038.71 km) |
| Middelkerke to Palencia | 722.40 mi (1,162.59 km) |
