| Castelfidardo to Popovo | 636.27 mi (1,023.98 km) |
| Castelfidardo to Provadia | 697.50 mi (1,122.51 km) |
| Castelfidardo to Radnevo | 631.68 mi (1,016.59 km) |
| Castelfidardo to Radomir | 479.06 mi (770.97 km) |
| Castelfidardo to Rakitovo | 544.16 mi (875.73 km) |
| Castelfidardo to Rakovski | 583.41 mi (938.90 km) |
| Castelfidardo to Razgrad | 649.44 mi (1,045.17 km) |
| Castelfidardo to Razlog | 515.32 mi (829.33 km) |
| Castelfidardo to Ruse | 620.29 mi (998.26 km) |
| Castelfidardo to Samokov | 512.23 mi (824.35 km) |
| Castelfidardo to Sandanski | 512.52 mi (824.82 km) |
| Castelfidardo to Sevlievo | 582.49 mi (937.43 km) |
| Castelfidardo to Shumen | 671.74 mi (1,081.06 km) |
| Castelfidardo to Silistra | 684.72 mi (1,101.95 km) |
| Castelfidardo to Sliven | 646.99 mi (1,041.23 km) |
