| Porsgrunn to Sestu | 1,369.44 mi (2,203.90 km) |
| Porsgrunn to Settimo Torinese | 969.49 mi (1,560.24 km) |
| Porsgrunn to Seveso | 931.14 mi (1,498.53 km) |
| Porsgrunn to Sezze | 1,225.72 mi (1,972.60 km) |
| Porsgrunn to Siano | 1,283.70 mi (2,065.91 km) |
| Porsgrunn to Siena | 1,093.66 mi (1,760.08 km) |
| Porsgrunn to Signa | 1,060.99 mi (1,707.50 km) |
| Porsgrunn to Silea | 936.25 mi (1,506.76 km) |
| Porsgrunn to Silvi Paese | 1,159.99 mi (1,866.83 km) |
| Porsgrunn to Sinalunga | 1,101.87 mi (1,773.29 km) |
| Porsgrunn to Siniscola | 1,281.08 mi (2,061.70 km) |
| Porsgrunn to Sinnai | 1,369.13 mi (2,203.40 km) |
| Porsgrunn to Siracusa | 1,543.58 mi (2,484.15 km) |
| Porsgrunn to Solaro | 933.16 mi (1,501.78 km) |
| Porsgrunn to Soliera | 994.69 mi (1,600.81 km) |
