| Boussu to Provadia | 1,218.04 mi (1,960.24 km) |
| Boussu to Radnevo | 1,189.29 mi (1,913.97 km) |
| Boussu to Radomir | 1,056.90 mi (1,700.92 km) |
| Boussu to Rakitovo | 1,126.68 mi (1,813.22 km) |
| Boussu to Rakovski | 1,149.83 mi (1,850.48 km) |
| Boussu to Razgrad | 1,166.20 mi (1,876.81 km) |
| Boussu to Razlog | 1,106.20 mi (1,780.26 km) |
| Boussu to Ruse | 1,131.74 mi (1,821.36 km) |
| Boussu to Samokov | 1,090.33 mi (1,754.72 km) |
| Boussu to Sandanski | 1,112.71 mi (1,790.74 km) |
| Boussu to Sevlievo | 1,126.37 mi (1,812.72 km) |
| Boussu to Shumen | 1,193.10 mi (1,920.11 km) |
| Boussu to Silistra | 1,177.15 mi (1,894.44 km) |
| Boussu to Sliven | 1,190.70 mi (1,916.25 km) |
| Boussu to Smolyan | 1,168.75 mi (1,880.92 km) |
