| Castalla to Popovo | 1,434.66 mi (2,308.86 km) |
| Castalla to Provadia | 1,494.27 mi (2,404.79 km) |
| Castalla to Radnevo | 1,416.01 mi (2,278.85 km) |
| Castalla to Radomir | 1,264.96 mi (2,035.76 km) |
| Castalla to Rakitovo | 1,320.63 mi (2,125.34 km) |
| Castalla to Rakovski | 1,366.55 mi (2,199.24 km) |
| Castalla to Razgrad | 1,449.75 mi (2,333.15 km) |
| Castalla to Razlog | 1,288.71 mi (2,073.98 km) |
| Castalla to Ruse | 1,423.43 mi (2,290.80 km) |
| Castalla to Samokov | 1,294.75 mi (2,083.69 km) |
| Castalla to Sandanski | 1,278.56 mi (2,057.64 km) |
| Castalla to Sevlievo | 1,376.80 mi (2,215.75 km) |
| Castalla to Shumen | 1,469.49 mi (2,364.91 km) |
| Castalla to Silistra | 1,490.01 mi (2,397.95 km) |
| Castalla to Sliven | 1,437.22 mi (2,312.98 km) |
