| Alfter to Popovo | 1,034.65 mi (1,665.11 km) |
| Alfter to Provadia | 1,090.28 mi (1,754.64 km) |
| Alfter to Radnevo | 1,067.25 mi (1,717.58 km) |
| Alfter to Radomir | 940.98 mi (1,514.37 km) |
| Alfter to Rakitovo | 1,010.16 mi (1,625.69 km) |
| Alfter to Rakovski | 1,029.94 mi (1,657.53 km) |
| Alfter to Razgrad | 1,038.76 mi (1,671.72 km) |
| Alfter to Razlog | 991.75 mi (1,596.07 km) |
| Alfter to Ruse | 1,004.24 mi (1,616.16 km) |
| Alfter to Samokov | 973.71 mi (1,567.03 km) |
| Alfter to Sandanski | 1,000.13 mi (1,609.56 km) |
| Alfter to Sevlievo | 1,003.33 mi (1,614.71 km) |
| Alfter to Shumen | 1,065.82 mi (1,715.27 km) |
| Alfter to Silistra | 1,046.72 mi (1,684.53 km) |
| Alfter to Sliven | 1,066.51 mi (1,716.39 km) |
