| Boadilla del Monte to Smolyan | 1,485.57 mi (2,390.80 km) |
| Boadilla del Monte to Sofia | 1,409.37 mi (2,268.17 km) |
| Boadilla del Monte to Sopot | 1,481.59 mi (2,384.38 km) |
| Boadilla del Monte to Sozopol | 1,632.60 mi (2,627.41 km) |
| Boadilla del Monte to Sredets | 1,607.68 mi (2,587.31 km) |
| Boadilla del Monte to Stamboliyski | 1,473.27 mi (2,371.00 km) |
| Boadilla del Monte to Stara Zagora | 1,528.39 mi (2,459.70 km) |
| Boadilla del Monte to Svilengrad | 1,561.04 mi (2,512.25 km) |
| Boadilla del Monte to Svishtov | 1,508.65 mi (2,427.94 km) |
| Boadilla del Monte to Targovishte | 1,571.58 mi (2,529.21 km) |
| Boadilla del Monte to Teteven | 1,456.07 mi (2,343.31 km) |
| Boadilla del Monte to Troyan | 1,478.93 mi (2,380.11 km) |
| Boadilla del Monte to Tryavna | 1,518.59 mi (2,443.94 km) |
| Boadilla del Monte to Tutrakan | 1,570.95 mi (2,528.20 km) |
| Boadilla del Monte to Varna | 1,638.71 mi (2,637.24 km) |
