| Troisdorf to Smolyan | 1,049.54 mi (1,689.07 km) |
| Troisdorf to Sofia | 945.64 mi (1,521.86 km) |
| Troisdorf to Sopot | 1,002.26 mi (1,612.98 km) |
| Troisdorf to Sozopol | 1,128.99 mi (1,816.94 km) |
| Troisdorf to Sredets | 1,111.83 mi (1,789.31 km) |
| Troisdorf to Stamboliyski | 1,017.45 mi (1,637.43 km) |
| Troisdorf to Stara Zagora | 1,046.94 mi (1,684.89 km) |
| Troisdorf to Svilengrad | 1,098.31 mi (1,767.57 km) |
| Troisdorf to Svishtov | 984.33 mi (1,584.12 km) |
| Troisdorf to Targovishte | 1,049.09 mi (1,688.35 km) |
| Troisdorf to Teteven | 971.65 mi (1,563.72 km) |
| Troisdorf to Troyan | 990.61 mi (1,594.23 km) |
| Troisdorf to Tryavna | 1,022.04 mi (1,644.81 km) |
| Troisdorf to Tutrakan | 1,018.42 mi (1,638.99 km) |
| Troisdorf to Varna | 1,104.67 mi (1,777.80 km) |
