| Illingen to Smolyan | 1,006.62 mi (1,620.00 km) |
| Illingen to Sofia | 904.03 mi (1,454.90 km) |
| Illingen to Sopot | 964.72 mi (1,552.56 km) |
| Illingen to Sozopol | 1,098.36 mi (1,767.64 km) |
| Illingen to Sredets | 1,079.57 mi (1,737.40 km) |
| Illingen to Stamboliyski | 976.66 mi (1,571.78 km) |
| Illingen to Stara Zagora | 1,010.89 mi (1,626.86 km) |
| Illingen to Svilengrad | 1,060.58 mi (1,706.83 km) |
| Illingen to Svishtov | 953.74 mi (1,534.90 km) |
| Illingen to Targovishte | 1,019.80 mi (1,641.21 km) |
| Illingen to Teteven | 934.08 mi (1,503.25 km) |
| Illingen to Troyan | 954.19 mi (1,535.62 km) |
| Illingen to Tryavna | 987.78 mi (1,589.68 km) |
| Illingen to Tutrakan | 993.63 mi (1,599.10 km) |
| Illingen to Varna | 1,078.59 mi (1,735.82 km) |
