| Castano Primo to Popovo | 872.99 mi (1,404.95 km) |
| Castano Primo to Provadia | 934.17 mi (1,503.41 km) |
| Castano Primo to Radnevo | 881.39 mi (1,418.46 km) |
| Castano Primo to Radomir | 733.07 mi (1,179.77 km) |
| Castano Primo to Rakitovo | 801.52 mi (1,289.91 km) |
| Castano Primo to Rakovski | 835.46 mi (1,344.54 km) |
| Castano Primo to Razgrad | 883.27 mi (1,421.48 km) |
| Castano Primo to Razlog | 775.22 mi (1,247.60 km) |
| Castano Primo to Ruse | 850.99 mi (1,369.54 km) |
| Castano Primo to Samokov | 767.19 mi (1,234.67 km) |
| Castano Primo to Sandanski | 775.74 mi (1,248.44 km) |
| Castano Primo to Sevlievo | 825.54 mi (1,328.58 km) |
| Castano Primo to Shumen | 908.08 mi (1,461.41 km) |
| Castano Primo to Silistra | 909.51 mi (1,463.72 km) |
| Castano Primo to Sliven | 891.64 mi (1,434.95 km) |
