| Preston to Olivares | 1,141.06 mi (1,836.36 km) |
| Preston to Olivenza | 1,061.98 mi (1,709.09 km) |
| Preston to Olot | 834.54 mi (1,343.06 km) |
| Preston to Onate | 741.19 mi (1,192.82 km) |
| Preston to Onda | 960.01 mi (1,544.99 km) |
| Preston to Onteniente | 1,036.74 mi (1,668.47 km) |
| Preston to Orihuela | 1,086.11 mi (1,747.93 km) |
| Preston to Osuna | 1,147.55 mi (1,846.81 km) |
| Preston to Ourense | 823.93 mi (1,325.99 km) |
| Preston to Oviedo | 732.57 mi (1,178.96 km) |
| Preston to Paiporta | 995.96 mi (1,602.84 km) |
| Preston to Pajara | 1,848.05 mi (2,974.14 km) |
| Preston to Palafolls | 872.25 mi (1,403.75 km) |
| Preston to Palafrugell | 861.43 mi (1,386.33 km) |
| Preston to Palamos | 865.69 mi (1,393.19 km) |
