| Castalla to Octeville | 763.62 mi (1,228.93 km) |
| Castalla to Oignies | 839.66 mi (1,351.29 km) |
| Castalla to Oissel | 747.52 mi (1,203.01 km) |
| Castalla to Olivet | 653.15 mi (1,051.15 km) |
| Castalla to Ollioules | 462.86 mi (744.90 km) |
| Castalla to Olonne-sur-Mer | 551.40 mi (887.40 km) |
| Castalla to Oloron-Sainte-Marie | 317.67 mi (511.25 km) |
| Castalla to Onet Village | 432.83 mi (696.58 km) |
| Castalla to Onnaing | 841.05 mi (1,353.54 km) |
| Castalla to Orange | 476.58 mi (766.98 km) |
| Castalla to Orchies | 842.72 mi (1,356.23 km) |
| Castalla to Orleans | 655.84 mi (1,055.47 km) |
| Castalla to Orly | 717.47 mi (1,154.65 km) |
| Castalla to Ormesson-sur-Marne | 721.85 mi (1,161.70 km) |
| Castalla to Orsay | 712.28 mi (1,146.30 km) |
