| Porsgrunn to Solofra | 1,282.75 mi (2,064.38 km) |
| Porsgrunn to Somma Lombardo | 929.03 mi (1,495.13 km) |
| Porsgrunn to Somma Vesuviana | 1,277.07 mi (2,055.24 km) |
| Porsgrunn to Sommacampagna | 948.85 mi (1,527.02 km) |
| Porsgrunn to Sona | 946.51 mi (1,523.27 km) |
| Porsgrunn to Sondrio | 894.50 mi (1,439.56 km) |
| Porsgrunn to Sora | 1,213.88 mi (1,953.55 km) |
| Porsgrunn to Sorbolo | 986.40 mi (1,587.46 km) |
| Porsgrunn to Soresina | 955.52 mi (1,537.76 km) |
| Porsgrunn to Sorisole | 924.34 mi (1,487.58 km) |
| Porsgrunn to Sorrento | 1,293.39 mi (2,081.51 km) |
| Porsgrunn to Sorso | 1,266.56 mi (2,038.33 km) |
| Porsgrunn to Sortino | 1,535.10 mi (2,470.50 km) |
| Porsgrunn to Soverato Marina | 1,443.73 mi (2,323.46 km) |
| Porsgrunn to Sovicille | 1,095.82 mi (1,763.55 km) |
