| Diest to Olivenza | 1,034.68 mi (1,665.15 km) |
| Diest to Olot | 620.14 mi (998.02 km) |
| Diest to Onate | 651.65 mi (1,048.73 km) |
| Diest to Onda | 803.39 mi (1,292.93 km) |
| Diest to Onteniente | 884.13 mi (1,422.87 km) |
| Diest to Orihuela | 938.14 mi (1,509.79 km) |
| Diest to Osuna | 1,073.03 mi (1,726.87 km) |
| Diest to Ourense | 853.32 mi (1,373.28 km) |
| Diest to Oviedo | 733.01 mi (1,179.67 km) |
| Diest to Paiporta | 841.13 mi (1,353.67 km) |
| Diest to Pajara | 1,854.08 mi (2,983.85 km) |
| Diest to Palafolls | 652.84 mi (1,050.65 km) |
| Diest to Palafrugell | 632.85 mi (1,018.47 km) |
| Diest to Palamos | 637.98 mi (1,026.73 km) |
| Diest to Palencia | 767.88 mi (1,235.79 km) |
