| Rhondda to Karlovo | 1,452.33 mi (2,337.29 km) |
| Rhondda to Karnobat | 1,543.74 mi (2,484.41 km) |
| Rhondda to Kavarna | 1,570.46 mi (2,527.40 km) |
| Rhondda to Kazanlak | 1,478.09 mi (2,378.76 km) |
| Rhondda to Knezha | 1,388.82 mi (2,235.09 km) |
| Rhondda to Kostinbrod | 1,379.48 mi (2,220.05 km) |
| Rhondda to Kozloduy | 1,363.46 mi (2,194.27 km) |
| Rhondda to Kyustendil | 1,379.27 mi (2,219.72 km) |
| Rhondda to Levski | 1,437.87 mi (2,314.03 km) |
| Rhondda to Lom | 1,341.13 mi (2,158.34 km) |
| Rhondda to Lovech | 1,429.34 mi (2,300.29 km) |
| Rhondda to Lukovit | 1,403.83 mi (2,259.24 km) |
| Rhondda to Lyaskovets | 1,472.53 mi (2,369.81 km) |
| Rhondda to Mezdra | 1,386.33 mi (2,231.09 km) |
| Rhondda to Momchilgrad | 1,522.75 mi (2,450.62 km) |
