| Helensburgh to Santarem | 1,173.61 mi (1,888.74 km) |
| Helensburgh to Santiago do Cacem | 1,257.12 mi (2,023.13 km) |
| Helensburgh to Santo Andre | 1,255.17 mi (2,020.01 km) |
| Helensburgh to Santo Tirso | 1,028.34 mi (1,654.95 km) |
| Helensburgh to Sao Bras de Alportel | 1,311.77 mi (2,111.09 km) |
| Helensburgh to Sao Felix da Marinha | 1,049.97 mi (1,689.76 km) |
| Helensburgh to Sao Joao da Madeira | 1,058.33 mi (1,703.22 km) |
| Helensburgh to Sao Joao de Ver | 1,054.90 mi (1,697.70 km) |
| Helensburgh to Sao Mamede de Infesta | 1,038.44 mi (1,671.22 km) |
| Helensburgh to Sao Pedro do Sul | 1,065.54 mi (1,714.82 km) |
| Helensburgh to Satao | 1,064.66 mi (1,713.40 km) |
| Helensburgh to Seia | 1,085.86 mi (1,747.53 km) |
| Helensburgh to Senhora da Hora | 1,039.79 mi (1,673.38 km) |
| Helensburgh to Serpa | 1,255.66 mi (2,020.79 km) |
| Helensburgh to Serta | 1,130.92 mi (1,820.04 km) |
