| Boortmeerbeek to Provadia | 1,196.49 mi (1,925.56 km) |
| Boortmeerbeek to Radnevo | 1,171.47 mi (1,885.31 km) |
| Boortmeerbeek to Radomir | 1,042.59 mi (1,677.89 km) |
| Boortmeerbeek to Rakitovo | 1,112.09 mi (1,789.73 km) |
| Boortmeerbeek to Rakovski | 1,133.30 mi (1,823.87 km) |
| Boortmeerbeek to Razgrad | 1,144.85 mi (1,842.46 km) |
| Boortmeerbeek to Razlog | 1,092.75 mi (1,758.61 km) |
| Boortmeerbeek to Ruse | 1,110.34 mi (1,786.92 km) |
| Boortmeerbeek to Samokov | 1,075.65 mi (1,731.10 km) |
| Boortmeerbeek to Sandanski | 1,100.29 mi (1,770.74 km) |
| Boortmeerbeek to Sevlievo | 1,107.90 mi (1,782.99 km) |
| Boortmeerbeek to Shumen | 1,171.87 mi (1,885.95 km) |
| Boortmeerbeek to Silistra | 1,153.66 mi (1,856.64 km) |
| Boortmeerbeek to Sliven | 1,171.53 mi (1,885.40 km) |
| Boortmeerbeek to Smolyan | 1,154.20 mi (1,857.50 km) |
