| Helensburgh to Carmona | 1,282.35 mi (2,063.75 km) |
| Helensburgh to Cartagena | 1,284.30 mi (2,066.88 km) |
| Helensburgh to Cartama | 1,333.87 mi (2,146.65 km) |
| Helensburgh to Cartaya | 1,299.21 mi (2,090.88 km) |
| Helensburgh to Caspe | 1,043.13 mi (1,678.76 km) |
| Helensburgh to Cassa de la Selva | 1,033.83 mi (1,663.79 km) |
| Helensburgh to Castalla | 1,218.03 mi (1,960.23 km) |
| Helensburgh to Castellbisbal | 1,048.96 mi (1,688.14 km) |
| Helensburgh to Castelldefels | 1,062.05 mi (1,709.21 km) |
| Helensburgh to Castello de Ampurias | 1,012.48 mi (1,629.43 km) |
| Helensburgh to Castellon de la Plana | 1,128.27 mi (1,815.77 km) |
| Helensburgh to Castilleja de la Cuesta | 1,288.89 mi (2,074.27 km) |
| Helensburgh to Catarroja | 1,164.84 mi (1,874.63 km) |
| Helensburgh to Catral | 1,247.07 mi (2,006.97 km) |
| Helensburgh to Caudete | 1,208.49 mi (1,944.87 km) |
