| Castalla to Karlovo | 1,359.64 mi (2,188.13 km) |
| Castalla to Karnobat | 1,470.12 mi (2,365.92 km) |
| Castalla to Kavarna | 1,540.25 mi (2,478.80 km) |
| Castalla to Kazanlak | 1,389.64 mi (2,236.41 km) |
| Castalla to Knezha | 1,328.14 mi (2,137.43 km) |
| Castalla to Kostinbrod | 1,280.00 mi (2,059.96 km) |
| Castalla to Kozloduy | 1,313.10 mi (2,113.23 km) |
| Castalla to Kyustendil | 1,250.04 mi (2,011.74 km) |
| Castalla to Levski | 1,379.66 mi (2,220.35 km) |
| Castalla to Lom | 1,288.99 mi (2,074.43 km) |
| Castalla to Lovech | 1,357.45 mi (2,184.60 km) |
| Castalla to Lukovit | 1,330.20 mi (2,140.76 km) |
| Castalla to Lyaskovets | 1,407.54 mi (2,265.22 km) |
| Castalla to Mezdra | 1,306.47 mi (2,102.55 km) |
| Castalla to Momchilgrad | 1,388.89 mi (2,235.21 km) |
