| Castelo Branco to Karlovo | 1,679.78 mi (2,703.35 km) |
| Castelo Branco to Karnobat | 1,790.04 mi (2,880.79 km) |
| Castelo Branco to Kavarna | 1,853.02 mi (2,982.15 km) |
| Castelo Branco to Kazanlak | 1,709.97 mi (2,751.93 km) |
| Castelo Branco to Knezha | 1,640.02 mi (2,639.35 km) |
| Castelo Branco to Kostinbrod | 1,598.46 mi (2,572.47 km) |
| Castelo Branco to Kozloduy | 1,621.99 mi (2,610.34 km) |
| Castelo Branco to Kyustendil | 1,573.62 mi (2,532.50 km) |
| Castelo Branco to Levski | 1,693.05 mi (2,724.70 km) |
| Castelo Branco to Lom | 1,597.22 mi (2,570.48 km) |
| Castelo Branco to Lovech | 1,673.00 mi (2,692.43 km) |
| Castelo Branco to Lukovit | 1,645.06 mi (2,647.47 km) |
| Castelo Branco to Lyaskovets | 1,723.46 mi (2,773.64 km) |
| Castelo Branco to Mezdra | 1,621.73 mi (2,609.92 km) |
| Castelo Branco to Momchilgrad | 1,718.53 mi (2,765.70 km) |
