| Boadilla del Monte to Sestu | 691.40 mi (1,112.70 km) |
| Boadilla del Monte to Settimo Torinese | 673.82 mi (1,084.42 km) |
| Boadilla del Monte to Seveso | 748.97 mi (1,205.35 km) |
| Boadilla del Monte to Sezze | 885.85 mi (1,425.63 km) |
| Boadilla del Monte to Siano | 972.65 mi (1,565.34 km) |
| Boadilla del Monte to Siena | 806.65 mi (1,298.17 km) |
| Boadilla del Monte to Signa | 801.11 mi (1,289.26 km) |
| Boadilla del Monte to Silea | 891.53 mi (1,434.79 km) |
| Boadilla del Monte to Silvi Paese | 941.19 mi (1,514.70 km) |
| Boadilla del Monte to Sinalunga | 825.56 mi (1,328.62 km) |
| Boadilla del Monte to Siniscola | 712.51 mi (1,146.67 km) |
| Boadilla del Monte to Sinnai | 697.21 mi (1,122.05 km) |
| Boadilla del Monte to Siracusa | 1,055.91 mi (1,699.32 km) |
| Boadilla del Monte to Solaro | 745.81 mi (1,200.26 km) |
| Boadilla del Monte to Soliera | 808.83 mi (1,301.68 km) |
