| Boulogne-Billancourt to Karlovo | 1,163.82 mi (1,872.99 km) |
| Boulogne-Billancourt to Karnobat | 1,261.05 mi (2,029.46 km) |
| Boulogne-Billancourt to Kavarna | 1,296.55 mi (2,086.59 km) |
| Boulogne-Billancourt to Kazanlak | 1,191.03 mi (1,916.77 km) |
| Boulogne-Billancourt to Knezha | 1,103.63 mi (1,776.12 km) |
| Boulogne-Billancourt to Kostinbrod | 1,087.69 mi (1,750.46 km) |
| Boulogne-Billancourt to Kozloduy | 1,079.19 mi (1,736.79 km) |
| Boulogne-Billancourt to Kyustendil | 1,083.16 mi (1,743.18 km) |
| Boulogne-Billancourt to Levski | 1,154.72 mi (1,858.35 km) |
| Boulogne-Billancourt to Lom | 1,055.75 mi (1,699.07 km) |
| Boulogne-Billancourt to Lovech | 1,143.56 mi (1,840.38 km) |
| Boulogne-Billancourt to Lukovit | 1,116.94 mi (1,797.54 km) |
| Boulogne-Billancourt to Lyaskovets | 1,189.28 mi (1,913.95 km) |
| Boulogne-Billancourt to Mezdra | 1,097.85 mi (1,766.82 km) |
| Boulogne-Billancourt to Momchilgrad | 1,229.88 mi (1,979.30 km) |
