| Boulogne-sur-Mer to Devnya | 1,320.24 mi (2,124.72 km) |
| Boulogne-sur-Mer to Dimitrovgrad | 1,282.68 mi (2,064.27 km) |
| Boulogne-sur-Mer to Dobrich | 1,318.92 mi (2,122.59 km) |
| Boulogne-sur-Mer to Dospat | 1,240.44 mi (1,996.30 km) |
| Boulogne-sur-Mer to Dupnitsa | 1,171.85 mi (1,885.90 km) |
| Boulogne-sur-Mer to Elhovo | 1,318.25 mi (2,121.51 km) |
| Boulogne-sur-Mer to Etropole | 1,184.84 mi (1,906.82 km) |
| Boulogne-sur-Mer to Gabrovo | 1,239.07 mi (1,994.09 km) |
| Boulogne-sur-Mer to Gorna Oryahovitsa | 1,244.24 mi (2,002.41 km) |
| Boulogne-sur-Mer to Gotse Delchev | 1,226.44 mi (1,973.76 km) |
| Boulogne-sur-Mer to Harmanli | 1,299.87 mi (2,091.94 km) |
| Boulogne-sur-Mer to Haskovo | 1,286.06 mi (2,069.72 km) |
| Boulogne-sur-Mer to Ihtiman | 1,193.24 mi (1,920.34 km) |
| Boulogne-sur-Mer to Isperih | 1,270.79 mi (2,045.14 km) |
| Boulogne-sur-Mer to Kardzhali | 1,289.53 mi (2,075.29 km) |
