| Helensburgh to Coswig | 751.65 mi (1,209.67 km) |
| Helensburgh to Cottbus | 826.96 mi (1,330.86 km) |
| Helensburgh to Crailsheim | 779.92 mi (1,255.17 km) |
| Helensburgh to Cremlingen | 673.30 mi (1,083.57 km) |
| Helensburgh to Crimmitschau | 788.33 mi (1,268.69 km) |
| Helensburgh to Cuxhaven | 552.37 mi (888.95 km) |
| Helensburgh to Dachau | 866.62 mi (1,394.69 km) |
| Helensburgh to Dallgow-Doberitz | 754.22 mi (1,213.80 km) |
| Helensburgh to Damme | 573.82 mi (923.48 km) |
| Helensburgh to Darmstadt | 698.63 mi (1,124.34 km) |
| Helensburgh to Dassel | 653.56 mi (1,051.80 km) |
| Helensburgh to Datteln | 576.10 mi (927.14 km) |
| Helensburgh to Dautphe | 650.97 mi (1,047.64 km) |
| Helensburgh to Deggendorf | 891.79 mi (1,435.19 km) |
| Helensburgh to Delbruck | 614.61 mi (989.12 km) |
