| Troisdorf to Karlovo | 1,004.76 mi (1,617.01 km) |
| Troisdorf to Karnobat | 1,091.02 mi (1,755.83 km) |
| Troisdorf to Kavarna | 1,113.19 mi (1,791.50 km) |
| Troisdorf to Kazanlak | 1,029.05 mi (1,656.10 km) |
| Troisdorf to Knezha | 938.98 mi (1,511.14 km) |
| Troisdorf to Kostinbrod | 935.98 mi (1,506.32 km) |
| Troisdorf to Kozloduy | 913.12 mi (1,469.53 km) |
| Troisdorf to Kyustendil | 941.19 mi (1,514.70 km) |
| Troisdorf to Levski | 986.13 mi (1,587.02 km) |
| Troisdorf to Lom | 891.88 mi (1,435.35 km) |
| Troisdorf to Lovech | 979.63 mi (1,576.56 km) |
| Troisdorf to Lukovit | 955.26 mi (1,537.34 km) |
| Troisdorf to Lyaskovets | 1,020.62 mi (1,642.53 km) |
| Troisdorf to Mezdra | 939.37 mi (1,511.77 km) |
| Troisdorf to Momchilgrad | 1,078.99 mi (1,736.47 km) |
