| Caerphilly to Karlovo | 1,443.38 mi (2,322.90 km) |
| Caerphilly to Karnobat | 1,534.82 mi (2,470.06 km) |
| Caerphilly to Kavarna | 1,561.60 mi (2,513.15 km) |
| Caerphilly to Kazanlak | 1,469.15 mi (2,364.37 km) |
| Caerphilly to Knezha | 1,379.89 mi (2,220.71 km) |
| Caerphilly to Kostinbrod | 1,370.52 mi (2,205.65 km) |
| Caerphilly to Kozloduy | 1,354.53 mi (2,179.90 km) |
| Caerphilly to Kyustendil | 1,370.32 mi (2,205.31 km) |
| Caerphilly to Levski | 1,428.95 mi (2,299.67 km) |
| Caerphilly to Lom | 1,332.20 mi (2,143.96 km) |
| Caerphilly to Lovech | 1,420.40 mi (2,285.92 km) |
| Caerphilly to Lukovit | 1,394.89 mi (2,244.85 km) |
| Caerphilly to Lyaskovets | 1,463.61 mi (2,355.45 km) |
| Caerphilly to Mezdra | 1,377.39 mi (2,216.70 km) |
| Caerphilly to Momchilgrad | 1,513.79 mi (2,436.22 km) |
