| Helensburgh to Sesena | 1,100.49 mi (1,771.07 km) |
| Helensburgh to Sestao | 881.21 mi (1,418.17 km) |
| Helensburgh to Sevilla | 1,298.65 mi (2,089.98 km) |
| Helensburgh to Sevilla La Nueva | 1,083.10 mi (1,743.08 km) |
| Helensburgh to Silla | 1,167.60 mi (1,879.07 km) |
| Helensburgh to Silleda | 933.17 mi (1,501.78 km) |
| Helensburgh to Sitges | 1,062.97 mi (1,710.68 km) |
| Helensburgh to Socuellamos | 1,158.87 mi (1,865.02 km) |
| Helensburgh to Soller | 1,172.76 mi (1,887.37 km) |
| Helensburgh to Solsona | 1,008.40 mi (1,622.87 km) |
| Helensburgh to Son Servera | 1,191.51 mi (1,917.54 km) |
| Helensburgh to Sonseca | 1,127.93 mi (1,815.23 km) |
| Helensburgh to Sopelana | 876.45 mi (1,410.50 km) |
| Helensburgh to Soria | 989.80 mi (1,592.94 km) |
| Helensburgh to Suances | 869.95 mi (1,400.04 km) |
