| Guadarrama to Solofra | 989.39 mi (1,592.28 km) |
| Guadarrama to Somma Lombardo | 730.26 mi (1,175.25 km) |
| Guadarrama to Somma Vesuviana | 967.65 mi (1,557.27 km) |
| Guadarrama to Sommacampagna | 820.48 mi (1,320.43 km) |
| Guadarrama to Sona | 820.43 mi (1,320.36 km) |
| Guadarrama to Sondrio | 795.25 mi (1,279.83 km) |
| Guadarrama to Sora | 921.72 mi (1,483.36 km) |
| Guadarrama to Sorbolo | 790.45 mi (1,272.11 km) |
| Guadarrama to Soresina | 772.30 mi (1,242.90 km) |
| Guadarrama to Sorisole | 774.24 mi (1,246.02 km) |
| Guadarrama to Sorrento | 966.04 mi (1,554.69 km) |
| Guadarrama to Sorso | 662.60 mi (1,066.35 km) |
| Guadarrama to Sortino | 1,053.79 mi (1,695.92 km) |
| Guadarrama to Soverato Marina | 1,103.51 mi (1,775.93 km) |
| Guadarrama to Sovicille | 806.16 mi (1,297.39 km) |
