| Cave to Olivenza | 1,075.76 mi (1,731.27 km) |
| Cave to Olot | 536.54 mi (863.48 km) |
| Cave to Onate | 786.27 mi (1,265.37 km) |
| Cave to Onda | 700.39 mi (1,127.17 km) |
| Cave to Onteniente | 741.80 mi (1,193.81 km) |
| Cave to Orihuela | 777.99 mi (1,252.05 km) |
| Cave to Osuna | 1,009.64 mi (1,624.85 km) |
| Cave to Ourense | 1,064.49 mi (1,713.13 km) |
| Cave to Oviedo | 959.11 mi (1,543.53 km) |
| Cave to Paiporta | 718.58 mi (1,156.44 km) |
| Cave to Pajara | 1,777.82 mi (2,861.13 km) |
| Cave to Palafolls | 524.74 mi (844.49 km) |
| Cave to Palafrugell | 502.49 mi (808.67 km) |
| Cave to Palamos | 504.48 mi (811.89 km) |
| Cave to Palencia | 896.56 mi (1,442.88 km) |
