| Boiro to Smolyan | 1,712.28 mi (2,755.65 km) |
| Boiro to Sofia | 1,627.16 mi (2,618.65 km) |
| Boiro to Sopot | 1,698.57 mi (2,733.59 km) |
| Boiro to Sozopol | 1,848.74 mi (2,975.26 km) |
| Boiro to Sredets | 1,824.92 mi (2,936.93 km) |
| Boiro to Stamboliyski | 1,695.24 mi (2,728.23 km) |
| Boiro to Stara Zagora | 1,746.50 mi (2,810.72 km) |
| Boiro to Svilengrad | 1,784.41 mi (2,871.73 km) |
| Boiro to Svishtov | 1,715.95 mi (2,761.55 km) |
| Boiro to Targovishte | 1,781.38 mi (2,866.86 km) |
| Boiro to Teteven | 1,670.95 mi (2,689.14 km) |
| Boiro to Troyan | 1,693.75 mi (2,725.83 km) |
| Boiro to Tryavna | 1,732.88 mi (2,788.79 km) |
| Boiro to Tutrakan | 1,773.23 mi (2,853.74 km) |
| Boiro to Varna | 1,847.65 mi (2,973.51 km) |
