| Helensburgh to Cernavoda | 1,637.28 mi (2,634.95 km) |
| Helensburgh to Chitila | 1,553.59 mi (2,500.27 km) |
| Helensburgh to Cisnadie | 1,431.62 mi (2,303.96 km) |
| Helensburgh to Cluj-Napoca | 1,364.51 mi (2,195.97 km) |
| Helensburgh to Codlea | 1,480.13 mi (2,382.04 km) |
| Helensburgh to Comanesti | 1,486.01 mi (2,391.51 km) |
| Helensburgh to Comarnic | 1,507.07 mi (2,425.39 km) |
| Helensburgh to Constanta | 1,667.41 mi (2,683.44 km) |
| Helensburgh to Corabia | 1,534.18 mi (2,469.02 km) |
| Helensburgh to Costesti | 1,505.75 mi (2,423.27 km) |
| Helensburgh to Covasna | 1,501.06 mi (2,415.72 km) |
| Helensburgh to Craiova | 1,482.83 mi (2,386.39 km) |
| Helensburgh to Cristuru Secuiesc | 1,438.96 mi (2,315.78 km) |
| Helensburgh to Cugir | 1,396.85 mi (2,248.01 km) |
| Helensburgh to Cumpana | 1,666.98 mi (2,682.75 km) |
