| Boom to Provadia | 1,206.88 mi (1,942.29 km) |
| Boom to Radnevo | 1,182.15 mi (1,902.48 km) |
| Boom to Radomir | 1,053.47 mi (1,695.39 km) |
| Boom to Rakitovo | 1,122.94 mi (1,807.20 km) |
| Boom to Rakovski | 1,144.05 mi (1,841.17 km) |
| Boom to Razgrad | 1,155.26 mi (1,859.22 km) |
| Boom to Razlog | 1,103.66 mi (1,776.17 km) |
| Boom to Ruse | 1,120.75 mi (1,803.67 km) |
| Boom to Samokov | 1,086.51 mi (1,748.56 km) |
| Boom to Sandanski | 1,111.23 mi (1,788.36 km) |
| Boom to Sevlievo | 1,118.53 mi (1,800.10 km) |
| Boom to Shumen | 1,182.29 mi (1,902.71 km) |
| Boom to Silistra | 1,163.88 mi (1,873.08 km) |
| Boom to Sliven | 1,182.11 mi (1,902.42 km) |
| Boom to Smolyan | 1,165.05 mi (1,874.97 km) |
