| Helensburgh to Arcos de Valdevez | 992.84 mi (1,597.82 km) |
| Helensburgh to Arcozelo | 1,048.62 mi (1,687.59 km) |
| Helensburgh to Arganil | 1,101.95 mi (1,773.42 km) |
| Helensburgh to Arouca | 1,054.11 mi (1,696.43 km) |
| Helensburgh to Arruda dos Vinhos | 1,193.56 mi (1,920.85 km) |
| Helensburgh to Aveiro | 1,077.57 mi (1,734.18 km) |
| Helensburgh to Aver-o-Mar | 1,025.83 mi (1,650.91 km) |
| Helensburgh to Aves | 1,019.83 mi (1,641.26 km) |
| Helensburgh to Azambuja | 1,186.36 mi (1,909.26 km) |
| Helensburgh to Baiao | 1,036.75 mi (1,668.49 km) |
| Helensburgh to Barcelos | 1,016.93 mi (1,636.59 km) |
| Helensburgh to Barreiro | 1,215.22 mi (1,955.70 km) |
| Helensburgh to Batalha | 1,145.95 mi (1,844.22 km) |
| Helensburgh to Beja | 1,251.03 mi (2,013.33 km) |
| Helensburgh to Belas | 1,209.37 mi (1,946.29 km) |
