| Upminster to Carmona | 1,014.88 mi (1,633.29 km) |
| Upminster to Cartagena | 966.12 mi (1,554.81 km) |
| Upminster to Cartama | 1,053.22 mi (1,694.99 km) |
| Upminster to Cartaya | 1,050.27 mi (1,690.25 km) |
| Upminster to Caspe | 713.34 mi (1,148.00 km) |
| Upminster to Cassa de la Selva | 679.22 mi (1,093.10 km) |
| Upminster to Castalla | 896.49 mi (1,442.76 km) |
| Upminster to Castellbisbal | 701.18 mi (1,128.45 km) |
| Upminster to Castelldefels | 714.67 mi (1,150.15 km) |
| Upminster to Castello de Ampurias | 655.94 mi (1,055.64 km) |
| Upminster to Castellon de la Plana | 799.70 mi (1,287.00 km) |
| Upminster to Castilleja de la Cuesta | 1,026.37 mi (1,651.78 km) |
| Upminster to Catarroja | 840.28 mi (1,352.29 km) |
| Upminster to Catral | 927.01 mi (1,491.88 km) |
| Upminster to Caudete | 889.96 mi (1,432.25 km) |
