| Helensburgh to Benavente | 1,192.72 mi (1,919.50 km) |
| Helensburgh to Bombarral | 1,174.78 mi (1,890.62 km) |
| Helensburgh to Bougado | 1,028.77 mi (1,655.65 km) |
| Helensburgh to Braga | 1,013.15 mi (1,630.51 km) |
| Helensburgh to Braganca | 986.00 mi (1,586.81 km) |
| Helensburgh to Cabeceiras de Basto | 1,011.51 mi (1,627.87 km) |
| Helensburgh to Cacem | 1,210.00 mi (1,947.30 km) |
| Helensburgh to Cadaval | 1,176.72 mi (1,893.75 km) |
| Helensburgh to Caldas da Rainha | 1,165.12 mi (1,875.07 km) |
| Helensburgh to Calheta | 1,716.29 mi (2,762.10 km) |
| Helensburgh to Camara de Lobos | 1,715.21 mi (2,760.36 km) |
| Helensburgh to Canico | 1,716.71 mi (2,762.77 km) |
| Helensburgh to Cantanhede | 1,096.80 mi (1,765.13 km) |
| Helensburgh to Carregal do Sal | 1,086.84 mi (1,749.10 km) |
| Helensburgh to Cartaxo | 1,180.05 mi (1,899.10 km) |
