| Boston to Sestu | 1,038.75 mi (1,671.71 km) |
| Boston to Settimo Torinese | 645.57 mi (1,038.95 km) |
| Boston to Seveso | 652.21 mi (1,049.63 km) |
| Boston to Sezze | 999.45 mi (1,608.46 km) |
| Boston to Siano | 1,086.56 mi (1,748.66 km) |
| Boston to Siena | 845.83 mi (1,361.24 km) |
| Boston to Signa | 812.77 mi (1,308.03 km) |
| Boston to Silea | 748.86 mi (1,205.17 km) |
| Boston to Silvi Paese | 971.18 mi (1,562.96 km) |
| Boston to Sinalunga | 863.02 mi (1,388.90 km) |
| Boston to Siniscola | 970.33 mi (1,561.60 km) |
| Boston to Sinnai | 1,040.74 mi (1,674.92 km) |
| Boston to Siracusa | 1,323.06 mi (2,129.26 km) |
| Boston to Solaro | 652.30 mi (1,049.77 km) |
| Boston to Soliera | 754.25 mi (1,213.84 km) |
