| Sonneberg to Smolyan | 885.91 mi (1,425.73 km) |
| Sonneberg to Sofia | 781.61 mi (1,257.88 km) |
| Sonneberg to Sopot | 834.65 mi (1,343.25 km) |
| Sonneberg to Sozopol | 956.50 mi (1,539.34 km) |
| Sonneberg to Sredets | 940.29 mi (1,513.25 km) |
| Sonneberg to Stamboliyski | 852.25 mi (1,371.57 km) |
| Sonneberg to Stara Zagora | 878.06 mi (1,413.10 km) |
| Sonneberg to Svilengrad | 930.36 mi (1,497.27 km) |
| Sonneberg to Svishtov | 812.33 mi (1,307.32 km) |
| Sonneberg to Targovishte | 876.15 mi (1,410.02 km) |
| Sonneberg to Teteven | 804.24 mi (1,294.30 km) |
| Sonneberg to Troyan | 822.26 mi (1,323.30 km) |
| Sonneberg to Tryavna | 852.08 mi (1,371.29 km) |
| Sonneberg to Tutrakan | 843.46 mi (1,357.42 km) |
| Sonneberg to Varna | 930.05 mi (1,496.77 km) |
