| Portici to Olivenza | 1,145.57 mi (1,843.62 km) |
| Portici to Olot | 619.97 mi (997.75 km) |
| Portici to Onate | 873.38 mi (1,405.57 km) |
| Portici to Onda | 769.96 mi (1,239.13 km) |
| Portici to Onteniente | 804.14 mi (1,294.15 km) |
| Portici to Orihuela | 836.03 mi (1,345.46 km) |
| Portici to Osuna | 1,070.09 mi (1,722.14 km) |
| Portici to Ourense | 1,149.13 mi (1,849.35 km) |
| Portici to Oviedo | 1,047.12 mi (1,685.18 km) |
| Portici to Paiporta | 784.73 mi (1,262.90 km) |
| Portici to Pajara | 1,821.24 mi (2,931.01 km) |
| Portici to Palafolls | 604.53 mi (972.90 km) |
| Portici to Palafrugell | 584.12 mi (940.05 km) |
| Portici to Palamos | 585.58 mi (942.40 km) |
| Portici to Palencia | 979.43 mi (1,576.25 km) |
