| Niederkassel to Settimo Torinese | 394.14 mi (634.31 km) |
| Niederkassel to Seveso | 370.29 mi (595.92 km) |
| Niederkassel to Sezze | 704.93 mi (1,134.48 km) |
| Niederkassel to Siano | 783.15 mi (1,260.36 km) |
| Niederkassel to Siena | 555.93 mi (894.69 km) |
| Niederkassel to Signa | 521.78 mi (839.72 km) |
| Niederkassel to Silea | 430.89 mi (693.45 km) |
| Niederkassel to Silvi Paese | 661.84 mi (1,065.13 km) |
| Niederkassel to Sinalunga | 569.58 mi (916.65 km) |
| Niederkassel to Siniscola | 719.13 mi (1,157.32 km) |
| Niederkassel to Sinnai | 802.47 mi (1,291.45 km) |
| Niederkassel to Siracusa | 1,033.27 mi (1,662.89 km) |
| Niederkassel to Solaro | 371.56 mi (597.96 km) |
| Niederkassel to Soliera | 457.04 mi (735.54 km) |
| Niederkassel to Solofra | 784.75 mi (1,262.94 km) |
