| Sluis to Olivenza | 1,009.22 mi (1,624.18 km) |
| Sluis to Olot | 631.97 mi (1,017.05 km) |
| Sluis to Onate | 632.91 mi (1,018.56 km) |
| Sluis to Onda | 803.24 mi (1,292.69 km) |
| Sluis to Onteniente | 884.10 mi (1,422.81 km) |
| Sluis to Orihuela | 937.63 mi (1,508.97 km) |
| Sluis to Osuna | 1,057.55 mi (1,701.97 km) |
| Sluis to Ourense | 814.93 mi (1,311.50 km) |
| Sluis to Oviedo | 697.75 mi (1,122.93 km) |
| Sluis to Paiporta | 841.08 mi (1,353.59 km) |
| Sluis to Pajara | 1,827.14 mi (2,940.49 km) |
| Sluis to Palafolls | 666.68 mi (1,072.91 km) |
| Sluis to Palafrugell | 648.93 mi (1,044.36 km) |
| Sluis to Palamos | 653.91 mi (1,052.36 km) |
| Sluis to Palencia | 742.76 mi (1,195.36 km) |
