| Helensburgh to Karlovo | 1,599.92 mi (2,574.83 km) |
| Helensburgh to Karnobat | 1,678.70 mi (2,701.61 km) |
| Helensburgh to Kavarna | 1,690.12 mi (2,719.99 km) |
| Helensburgh to Kazanlak | 1,622.42 mi (2,611.03 km) |
| Helensburgh to Knezha | 1,532.25 mi (2,465.92 km) |
| Helensburgh to Kostinbrod | 1,535.09 mi (2,470.48 km) |
| Helensburgh to Kozloduy | 1,506.05 mi (2,423.76 km) |
| Helensburgh to Kyustendil | 1,543.34 mi (2,483.76 km) |
| Helensburgh to Levski | 1,576.39 mi (2,536.96 km) |
| Helensburgh to Lom | 1,486.31 mi (2,391.98 km) |
| Helensburgh to Lovech | 1,572.66 mi (2,530.96 km) |
| Helensburgh to Lukovit | 1,549.81 mi (2,494.17 km) |
| Helensburgh to Lyaskovets | 1,610.29 mi (2,591.52 km) |
| Helensburgh to Mezdra | 1,535.66 mi (2,471.40 km) |
| Helensburgh to Momchilgrad | 1,676.93 mi (2,698.76 km) |
