| Illertissen to Smolyan | 847.43 mi (1,363.81 km) |
| Illertissen to Sofia | 745.12 mi (1,199.15 km) |
| Illertissen to Sopot | 806.59 mi (1,298.09 km) |
| Illertissen to Sozopol | 942.19 mi (1,516.30 km) |
| Illertissen to Sredets | 922.85 mi (1,485.19 km) |
| Illertissen to Stamboliyski | 817.82 mi (1,316.15 km) |
| Illertissen to Stara Zagora | 853.09 mi (1,372.92 km) |
| Illertissen to Svilengrad | 902.29 mi (1,452.09 km) |
| Illertissen to Svishtov | 797.93 mi (1,284.14 km) |
| Illertissen to Targovishte | 864.34 mi (1,391.01 km) |
| Illertissen to Teteven | 775.99 mi (1,248.84 km) |
| Illertissen to Troyan | 796.39 mi (1,281.66 km) |
| Illertissen to Tryavna | 830.57 mi (1,336.67 km) |
| Illertissen to Tutrakan | 840.31 mi (1,352.34 km) |
| Illertissen to Varna | 924.37 mi (1,487.63 km) |
