| Sint-Pieters-Leeuw to Olivenza | 1,001.99 mi (1,612.54 km) |
| Sint-Pieters-Leeuw to Olot | 600.11 mi (965.78 km) |
| Sint-Pieters-Leeuw to Onate | 620.51 mi (998.61 km) |
| Sint-Pieters-Leeuw to Onda | 778.70 mi (1,253.20 km) |
| Sint-Pieters-Leeuw to Onteniente | 859.57 mi (1,383.34 km) |
| Sint-Pieters-Leeuw to Orihuela | 913.44 mi (1,470.04 km) |
| Sint-Pieters-Leeuw to Osuna | 1,043.23 mi (1,678.91 km) |
| Sint-Pieters-Leeuw to Ourense | 817.64 mi (1,315.87 km) |
| Sint-Pieters-Leeuw to Oviedo | 697.87 mi (1,123.11 km) |
| Sint-Pieters-Leeuw to Paiporta | 816.52 mi (1,314.07 km) |
| Sint-Pieters-Leeuw to Pajara | 1,821.22 mi (2,930.97 km) |
| Sint-Pieters-Leeuw to Palafolls | 633.75 mi (1,019.93 km) |
| Sint-Pieters-Leeuw to Palafrugell | 614.74 mi (989.34 km) |
| Sint-Pieters-Leeuw to Palamos | 619.81 mi (997.50 km) |
| Sint-Pieters-Leeuw to Palencia | 735.11 mi (1,183.04 km) |
