| Helensburgh to Cocentaina | 1,209.55 mi (1,946.59 km) |
| Helensburgh to Coin | 1,336.95 mi (2,151.61 km) |
| Helensburgh to Colindres | 873.80 mi (1,406.24 km) |
| Helensburgh to Collado-Villalba | 1,063.39 mi (1,711.36 km) |
| Helensburgh to Colmenar Viejo | 1,062.02 mi (1,709.15 km) |
| Helensburgh to Colmenarejo | 1,068.39 mi (1,719.40 km) |
| Helensburgh to Conil de la Frontera | 1,366.05 mi (2,198.45 km) |
| Helensburgh to Consuegra | 1,144.98 mi (1,842.66 km) |
| Helensburgh to Corbera de Llobregat | 1,052.31 mi (1,693.53 km) |
| Helensburgh to Cordoba | 1,252.81 mi (2,016.20 km) |
| Helensburgh to Coria del Rio | 1,295.79 mi (2,085.38 km) |
| Helensburgh to Crevillente | 1,240.93 mi (1,997.09 km) |
| Helensburgh to Cuarte de Huerva | 1,011.87 mi (1,628.44 km) |
| Helensburgh to Cubellas | 1,062.96 mi (1,710.67 km) |
| Helensburgh to Cuellar | 1,010.02 mi (1,625.48 km) |
