| Portsmouth to Solofra | 1,027.38 mi (1,653.42 km) |
| Portsmouth to Somma Lombardo | 571.97 mi (920.50 km) |
| Portsmouth to Somma Vesuviana | 1,010.85 mi (1,626.81 km) |
| Portsmouth to Sommacampagna | 664.23 mi (1,068.97 km) |
| Portsmouth to Sona | 662.16 mi (1,065.65 km) |
| Portsmouth to Sondrio | 594.38 mi (956.56 km) |
| Portsmouth to Sora | 939.09 mi (1,511.32 km) |
| Portsmouth to Sorbolo | 673.92 mi (1,084.57 km) |
| Portsmouth to Soresina | 632.15 mi (1,017.35 km) |
| Portsmouth to Sorisole | 604.64 mi (973.07 km) |
| Portsmouth to Sorrento | 1,021.28 mi (1,643.59 km) |
| Portsmouth to Sorso | 832.01 mi (1,338.99 km) |
| Portsmouth to Sortino | 1,231.55 mi (1,981.98 km) |
| Portsmouth to Soverato Marina | 1,198.62 mi (1,928.99 km) |
| Portsmouth to Sovicille | 777.03 mi (1,250.51 km) |
