| Boulogne-sur-Mer to Popovo | 1,258.64 mi (2,025.59 km) |
| Boulogne-sur-Mer to Provadia | 1,315.79 mi (2,117.56 km) |
| Boulogne-sur-Mer to Radnevo | 1,286.47 mi (2,070.37 km) |
| Boulogne-sur-Mer to Radomir | 1,153.13 mi (1,855.79 km) |
| Boulogne-sur-Mer to Rakitovo | 1,222.97 mi (1,968.19 km) |
| Boulogne-sur-Mer to Rakovski | 1,246.71 mi (2,006.38 km) |
| Boulogne-sur-Mer to Razgrad | 1,263.93 mi (2,034.10 km) |
| Boulogne-sur-Mer to Razlog | 1,202.09 mi (1,934.58 km) |
| Boulogne-sur-Mer to Ruse | 1,229.49 mi (1,978.67 km) |
| Boulogne-sur-Mer to Samokov | 1,186.67 mi (1,909.76 km) |
| Boulogne-sur-Mer to Sandanski | 1,208.20 mi (1,944.41 km) |
| Boulogne-sur-Mer to Sevlievo | 1,223.71 mi (1,969.36 km) |
| Boulogne-sur-Mer to Shumen | 1,290.83 mi (2,077.38 km) |
| Boulogne-sur-Mer to Silistra | 1,274.98 mi (2,051.88 km) |
| Boulogne-sur-Mer to Sliven | 1,288.16 mi (2,073.09 km) |
