| Port Huron to Sestu | 4,516.91 mi (7,269.26 km) |
| Port Huron to Settimo Torinese | 4,230.32 mi (6,808.04 km) |
| Port Huron to Seveso | 4,266.16 mi (6,865.71 km) |
| Port Huron to Sezze | 4,592.81 mi (7,391.42 km) |
| Port Huron to Siano | 4,689.23 mi (7,546.59 km) |
| Port Huron to Siena | 4,446.78 mi (7,156.40 km) |
| Port Huron to Signa | 4,418.59 mi (7,111.04 km) |
| Port Huron to Silea | 4,391.19 mi (7,066.94 km) |
| Port Huron to Silvi Paese | 4,591.43 mi (7,389.19 km) |
| Port Huron to Sinalunga | 4,467.26 mi (7,189.36 km) |
| Port Huron to Siniscola | 4,490.52 mi (7,226.79 km) |
| Port Huron to Sinnai | 4,521.56 mi (7,276.75 km) |
| Port Huron to Siracusa | 4,876.65 mi (7,848.21 km) |
| Port Huron to Solaro | 4,265.10 mi (6,864.02 km) |
| Port Huron to Soliera | 4,373.30 mi (7,038.14 km) |
