| Upminster to Cehegin | 935.53 mi (1,505.59 km) |
| Upminster to Cervello | 706.59 mi (1,137.14 km) |
| Upminster to Cervera | 685.03 mi (1,102.44 km) |
| Upminster to Ceuti | 934.09 mi (1,503.27 km) |
| Upminster to Cheste | 835.58 mi (1,344.74 km) |
| Upminster to Chiclana de la Frontera | 1,092.29 mi (1,757.87 km) |
| Upminster to Chipiona | 1,075.30 mi (1,730.52 km) |
| Upminster to Chiva | 836.25 mi (1,345.81 km) |
| Upminster to Churriana de la Vega | 1,013.45 mi (1,630.99 km) |
| Upminster to Ciempozuelos | 808.84 mi (1,301.70 km) |
| Upminster to Cieza | 923.64 mi (1,486.45 km) |
| Upminster to Cisterniga | 725.17 mi (1,167.04 km) |
| Upminster to Ciudad de Melilla | 1,135.49 mi (1,827.39 km) |
| Upminster to Ciudad Real | 891.62 mi (1,434.92 km) |
| Upminster to Ciudad-Rodrigo | 823.29 mi (1,324.96 km) |
