| Alenquer to Sestu | 968.47 mi (1,558.61 km) |
| Alenquer to Settimo Torinese | 955.19 mi (1,537.22 km) |
| Alenquer to Seveso | 1,029.74 mi (1,657.21 km) |
| Alenquer to Sezze | 1,173.08 mi (1,887.90 km) |
| Alenquer to Siano | 1,258.31 mi (2,025.05 km) |
| Alenquer to Siena | 1,095.30 mi (1,762.72 km) |
| Alenquer to Signa | 1,089.24 mi (1,752.96 km) |
| Alenquer to Silea | 1,175.50 mi (1,891.78 km) |
| Alenquer to Silvi Paese | 1,229.81 mi (1,979.19 km) |
| Alenquer to Sinalunga | 1,114.30 mi (1,793.29 km) |
| Alenquer to Siniscola | 996.84 mi (1,604.26 km) |
| Alenquer to Sinnai | 974.38 mi (1,568.12 km) |
| Alenquer to Siracusa | 1,325.29 mi (2,132.85 km) |
| Alenquer to Solaro | 1,026.64 mi (1,652.23 km) |
| Alenquer to Soliera | 1,094.82 mi (1,761.94 km) |
