| Waltham to Karlovo | 4,591.71 mi (7,389.64 km) |
| Waltham to Karnobat | 4,680.13 mi (7,531.94 km) |
| Waltham to Kavarna | 4,699.78 mi (7,563.56 km) |
| Waltham to Kazanlak | 4,616.92 mi (7,430.21 km) |
| Waltham to Knezha | 4,527.17 mi (7,285.78 km) |
| Waltham to Kostinbrod | 4,519.60 mi (7,273.59 km) |
| Waltham to Kozloduy | 4,501.51 mi (7,244.48 km) |
| Waltham to Kyustendil | 4,519.21 mi (7,272.97 km) |
| Waltham to Levski | 4,575.05 mi (7,362.83 km) |
| Waltham to Lom | 4,479.73 mi (7,209.42 km) |
| Waltham to Lovech | 4,567.80 mi (7,351.16 km) |
| Waltham to Lukovit | 4,542.79 mi (7,310.91 km) |
| Waltham to Lyaskovets | 4,609.60 mi (7,418.43 km) |
| Waltham to Mezdra | 4,525.84 mi (7,283.63 km) |
| Waltham to Momchilgrad | 4,662.90 mi (7,504.22 km) |
