| Gourock to Karlovo | 1,601.25 mi (2,576.96 km) |
| Gourock to Karnobat | 1,680.29 mi (2,704.16 km) |
| Gourock to Kavarna | 1,691.98 mi (2,722.98 km) |
| Gourock to Kazanlak | 1,623.81 mi (2,613.27 km) |
| Gourock to Knezha | 1,533.63 mi (2,468.15 km) |
| Gourock to Kostinbrod | 1,536.24 mi (2,472.35 km) |
| Gourock to Kozloduy | 1,507.45 mi (2,426.00 km) |
| Gourock to Kyustendil | 1,544.33 mi (2,485.37 km) |
| Gourock to Levski | 1,577.88 mi (2,539.36 km) |
| Gourock to Lom | 1,487.64 mi (2,394.13 km) |
| Gourock to Lovech | 1,574.06 mi (2,533.21 km) |
| Gourock to Lukovit | 1,551.15 mi (2,496.34 km) |
| Gourock to Lyaskovets | 1,611.81 mi (2,593.95 km) |
| Gourock to Mezdra | 1,536.93 mi (2,473.46 km) |
| Gourock to Momchilgrad | 1,678.16 mi (2,700.74 km) |
