| Helensburgh to Castrovillari | 1,468.79 mi (2,363.78 km) |
| Helensburgh to Catania | 1,574.40 mi (2,533.76 km) |
| Helensburgh to Catanzaro | 1,533.55 mi (2,468.01 km) |
| Helensburgh to Cattolica | 1,131.69 mi (1,821.27 km) |
| Helensburgh to Cava de' Tirreni | 1,374.36 mi (2,211.83 km) |
| Helensburgh to Cavallino | 1,500.68 mi (2,415.11 km) |
| Helensburgh to Cavarzere | 1,047.94 mi (1,686.49 km) |
| Helensburgh to Cave | 1,259.68 mi (2,027.27 km) |
| Helensburgh to Cavriago | 1,027.00 mi (1,652.80 km) |
| Helensburgh to Cavriglia | 1,121.08 mi (1,804.20 km) |
| Helensburgh to Cazzago San Martino | 963.08 mi (1,549.92 km) |
| Helensburgh to Ceccano | 1,285.39 mi (2,068.64 km) |
| Helensburgh to Cecina | 1,106.17 mi (1,780.21 km) |
| Helensburgh to Cefalu | 1,513.72 mi (2,436.10 km) |
| Helensburgh to Ceglie Messapico | 1,460.43 mi (2,350.34 km) |
