| Helensburgh to Collegno | 926.11 mi (1,490.42 km) |
| Helensburgh to Cologno al Serio | 953.73 mi (1,534.88 km) |
| Helensburgh to Cologno Monzese | 945.02 mi (1,520.86 km) |
| Helensburgh to Colorno | 1,009.59 mi (1,624.78 km) |
| Helensburgh to Comacchio | 1,074.85 mi (1,729.81 km) |
| Helensburgh to Comiso | 1,594.76 mi (2,566.52 km) |
| Helensburgh to Como | 923.76 mi (1,486.64 km) |
| Helensburgh to Concordia Sagittaria | 1,037.96 mi (1,670.44 km) |
| Helensburgh to Concorezzo | 943.16 mi (1,517.87 km) |
| Helensburgh to Conegliano | 1,014.39 mi (1,632.50 km) |
| Helensburgh to Conselice | 1,074.64 mi (1,729.47 km) |
| Helensburgh to Conselve | 1,036.24 mi (1,667.66 km) |
| Helensburgh to Conversano | 1,430.95 mi (2,302.89 km) |
| Helensburgh to Copertino | 1,498.84 mi (2,412.15 km) |
| Helensburgh to Copparo | 1,053.46 mi (1,695.38 km) |
