| Onex to Carmona | 851.30 mi (1,370.03 km) |
| Onex to Cartagena | 695.31 mi (1,119.00 km) |
| Onex to Cartama | 856.97 mi (1,379.15 km) |
| Onex to Cartaya | 916.94 mi (1,475.67 km) |
| Onex to Caspe | 458.86 mi (738.46 km) |
| Onex to Cassa de la Selva | 337.12 mi (542.54 km) |
| Onex to Castalla | 627.28 mi (1,009.50 km) |
| Onex to Castellbisbal | 384.42 mi (618.67 km) |
| Onex to Castelldefels | 396.29 mi (637.77 km) |
| Onex to Castello de Ampurias | 309.76 mi (498.51 km) |
| Onex to Castellon de la Plana | 528.13 mi (849.95 km) |
| Onex to Castilleja de la Cuesta | 870.78 mi (1,401.39 km) |
| Onex to Catarroja | 572.48 mi (921.31 km) |
| Onex to Catral | 656.97 mi (1,057.29 km) |
| Onex to Caudete | 630.00 mi (1,013.89 km) |
