| Upminster to Cadiz | 1,086.51 mi (1,748.56 km) |
| Upminster to Calafell | 718.20 mi (1,155.84 km) |
| Upminster to Calahorra | 647.93 mi (1,042.74 km) |
| Upminster to Calasparra | 925.53 mi (1,489.49 km) |
| Upminster to Calatayud | 710.76 mi (1,143.86 km) |
| Upminster to Caldas de Montbuy | 691.55 mi (1,112.94 km) |
| Upminster to Caldas de Reyes | 745.53 mi (1,199.81 km) |
| Upminster to Calella | 696.09 mi (1,120.26 km) |
| Upminster to Callosa de Segura | 929.77 mi (1,496.31 km) |
| Upminster to Calpe | 892.10 mi (1,435.69 km) |
| Upminster to Calvia | 835.48 mi (1,344.57 km) |
| Upminster to Camas | 1,024.87 mi (1,649.38 km) |
| Upminster to Cambados | 755.85 mi (1,216.43 km) |
| Upminster to Cambre | 697.37 mi (1,122.31 km) |
| Upminster to Cambrils | 725.70 mi (1,167.91 km) |
