| Willebroek to Olivenza | 1,020.59 mi (1,642.48 km) |
| Willebroek to Olot | 620.24 mi (998.17 km) |
| Willebroek to Onate | 639.73 mi (1,029.55 km) |
| Willebroek to Onda | 798.90 mi (1,285.70 km) |
| Willebroek to Onteniente | 879.76 mi (1,415.84 km) |
| Willebroek to Orihuela | 933.63 mi (1,502.53 km) |
| Willebroek to Osuna | 1,062.76 mi (1,710.34 km) |
| Willebroek to Ourense | 834.36 mi (1,342.78 km) |
| Willebroek to Oviedo | 715.08 mi (1,150.82 km) |
| Willebroek to Paiporta | 836.72 mi (1,346.57 km) |
| Willebroek to Pajara | 1,839.70 mi (2,960.72 km) |
| Willebroek to Palafolls | 653.82 mi (1,052.21 km) |
| Willebroek to Palafrugell | 634.72 mi (1,021.48 km) |
| Willebroek to Palamos | 639.80 mi (1,029.65 km) |
| Willebroek to Palencia | 753.71 mi (1,212.99 km) |
