| Castel San Giorgio to Olivenza | 1,164.34 mi (1,873.82 km) |
| Castel San Giorgio to Olot | 638.84 mi (1,028.11 km) |
| Castel San Giorgio to Onate | 892.13 mi (1,435.75 km) |
| Castel San Giorgio to Onda | 788.75 mi (1,269.37 km) |
| Castel San Giorgio to Onteniente | 822.64 mi (1,323.92 km) |
| Castel San Giorgio to Orihuela | 854.28 mi (1,374.84 km) |
| Castel San Giorgio to Osuna | 1,088.43 mi (1,751.66 km) |
| Castel San Giorgio to Ourense | 1,168.00 mi (1,879.71 km) |
| Castel San Giorgio to Oviedo | 1,065.84 mi (1,715.30 km) |
| Castel San Giorgio to Paiporta | 803.41 mi (1,292.96 km) |
| Castel San Giorgio to Pajara | 1,838.17 mi (2,958.25 km) |
| Castel San Giorgio to Palafolls | 623.46 mi (1,003.37 km) |
| Castel San Giorgio to Palafrugell | 603.03 mi (970.48 km) |
| Castel San Giorgio to Palamos | 604.49 mi (972.83 km) |
| Castel San Giorgio to Palencia | 998.34 mi (1,606.67 km) |
