| Civitavecchia to Olivenza | 1,019.90 mi (1,641.36 km) |
| Civitavecchia to Olot | 476.82 mi (767.37 km) |
| Civitavecchia to Onate | 725.43 mi (1,167.47 km) |
| Civitavecchia to Onda | 645.29 mi (1,038.49 km) |
| Civitavecchia to Onteniente | 689.66 mi (1,109.91 km) |
| Civitavecchia to Orihuela | 727.68 mi (1,171.09 km) |
| Civitavecchia to Osuna | 957.66 mi (1,541.20 km) |
| Civitavecchia to Ourense | 1,004.06 mi (1,615.87 km) |
| Civitavecchia to Oviedo | 898.07 mi (1,445.30 km) |
| Civitavecchia to Paiporta | 664.85 mi (1,069.97 km) |
| Civitavecchia to Pajara | 1,732.51 mi (2,788.20 km) |
| Civitavecchia to Palafolls | 466.23 mi (750.32 km) |
| Civitavecchia to Palafrugell | 443.40 mi (713.59 km) |
| Civitavecchia to Palamos | 445.57 mi (717.08 km) |
| Civitavecchia to Palencia | 836.63 mi (1,346.42 km) |
