| Middle Island to Smolyan | 4,763.92 mi (7,666.79 km) |
| Middle Island to Sofia | 4,661.76 mi (7,502.38 km) |
| Middle Island to Sopot | 4,722.20 mi (7,599.65 km) |
| Middle Island to Sozopol | 4,851.76 mi (7,808.16 km) |
| Middle Island to Sredets | 4,834.40 mi (7,780.22 km) |
| Middle Island to Stamboliyski | 4,734.44 mi (7,619.34 km) |
| Middle Island to Stara Zagora | 4,767.93 mi (7,673.24 km) |
| Middle Island to Svilengrad | 4,818.18 mi (7,754.11 km) |
| Middle Island to Svishtov | 4,707.07 mi (7,575.29 km) |
| Middle Island to Targovishte | 4,771.84 mi (7,679.53 km) |
| Middle Island to Teteven | 4,691.55 mi (7,550.31 km) |
| Middle Island to Troyan | 4,711.31 mi (7,582.13 km) |
| Middle Island to Tryavna | 4,743.91 mi (7,634.59 km) |
| Middle Island to Tutrakan | 4,739.97 mi (7,628.24 km) |
| Middle Island to Varna | 4,826.57 mi (7,767.61 km) |
