| Castellon de la Plana to Karlovo | 1,297.39 mi (2,087.95 km) |
| Castellon de la Plana to Karnobat | 1,407.99 mi (2,265.94 km) |
| Castellon de la Plana to Kavarna | 1,475.11 mi (2,373.96 km) |
| Castellon de la Plana to Kazanlak | 1,327.54 mi (2,136.47 km) |
| Castellon de la Plana to Knezha | 1,262.15 mi (2,031.23 km) |
| Castellon de la Plana to Kostinbrod | 1,216.78 mi (1,958.22 km) |
| Castellon de la Plana to Kozloduy | 1,245.83 mi (2,004.97 km) |
| Castellon de la Plana to Kyustendil | 1,189.19 mi (1,913.81 km) |
| Castellon de la Plana to Levski | 1,314.44 mi (2,115.39 km) |
| Castellon de la Plana to Lom | 1,221.39 mi (1,965.64 km) |
| Castellon de la Plana to Lovech | 1,293.11 mi (2,081.06 km) |
| Castellon de la Plana to Lukovit | 1,265.50 mi (2,036.62 km) |
| Castellon de la Plana to Lyaskovets | 1,343.48 mi (2,162.12 km) |
| Castellon de la Plana to Mezdra | 1,241.88 mi (1,998.61 km) |
| Castellon de la Plana to Momchilgrad | 1,331.41 mi (2,142.70 km) |
