| Castelldefels to Octeville | 602.62 mi (969.83 km) |
| Castelldefels to Oignies | 636.78 mi (1,024.79 km) |
| Castelldefels to Oissel | 558.67 mi (899.09 km) |
| Castelldefels to Olivet | 454.92 mi (732.12 km) |
| Castelldefels to Ollioules | 236.04 mi (379.87 km) |
| Castelldefels to Olonne-sur-Mer | 408.20 mi (656.93 km) |
| Castelldefels to Oloron-Sainte-Marie | 186.95 mi (300.86 km) |
| Castelldefels to Onet Village | 215.47 mi (346.77 km) |
| Castelldefels to Onnaing | 634.07 mi (1,020.43 km) |
| Castelldefels to Orange | 244.28 mi (393.13 km) |
| Castelldefels to Orchies | 638.18 mi (1,027.06 km) |
| Castelldefels to Orleans | 457.58 mi (736.41 km) |
| Castelldefels to Orly | 516.10 mi (830.59 km) |
| Castelldefels to Ormesson-sur-Marne | 519.32 mi (835.77 km) |
| Castelldefels to Orsay | 512.64 mi (825.02 km) |
