| Alken to Provadia | 1,163.52 mi (1,872.50 km) |
| Alken to Radnevo | 1,138.86 mi (1,832.82 km) |
| Alken to Radomir | 1,010.52 mi (1,626.28 km) |
| Alken to Rakitovo | 1,079.95 mi (1,738.02 km) |
| Alken to Rakovski | 1,100.86 mi (1,771.67 km) |
| Alken to Razgrad | 1,111.90 mi (1,789.43 km) |
| Alken to Razlog | 1,060.82 mi (1,707.23 km) |
| Alken to Ruse | 1,077.38 mi (1,733.88 km) |
| Alken to Samokov | 1,043.51 mi (1,679.37 km) |
| Alken to Sandanski | 1,068.55 mi (1,719.66 km) |
| Alken to Sevlievo | 1,075.22 mi (1,730.39 km) |
| Alken to Shumen | 1,138.92 mi (1,832.92 km) |
| Alken to Silistra | 1,120.59 mi (1,803.41 km) |
| Alken to Sliven | 1,138.77 mi (1,832.67 km) |
| Alken to Smolyan | 1,122.06 mi (1,805.79 km) |
