| Helensburgh to Cabestany | 982.63 mi (1,581.39 km) |
| Helensburgh to Cabries | 976.93 mi (1,572.22 km) |
| Helensburgh to Cachan | 580.60 mi (934.38 km) |
| Helensburgh to Caen | 506.36 mi (814.91 km) |
| Helensburgh to Cagnes-sur-Mer | 1,001.23 mi (1,611.32 km) |
| Helensburgh to Cahors | 843.81 mi (1,357.99 km) |
| Helensburgh to Calais | 442.36 mi (711.91 km) |
| Helensburgh to Caluire-et-Cuire | 818.65 mi (1,317.48 km) |
| Helensburgh to Cambrai | 520.97 mi (838.42 km) |
| Helensburgh to Canet-en-Roussillon | 981.98 mi (1,580.35 km) |
| Helensburgh to Cannes | 1,005.07 mi (1,617.51 km) |
| Helensburgh to Canteleu | 513.44 mi (826.30 km) |
| Helensburgh to Capbreton | 867.32 mi (1,395.82 km) |
| Helensburgh to Carcassonne | 938.77 mi (1,510.80 km) |
| Helensburgh to Carmaux | 880.56 mi (1,417.13 km) |
