| Port Glasgow to Karlovo | 1,596.20 mi (2,568.83 km) |
| Port Glasgow to Karnobat | 1,675.21 mi (2,695.99 km) |
| Port Glasgow to Kavarna | 1,686.89 mi (2,714.79 km) |
| Port Glasgow to Kazanlak | 1,618.75 mi (2,605.13 km) |
| Port Glasgow to Knezha | 1,528.58 mi (2,460.01 km) |
| Port Glasgow to Kostinbrod | 1,531.21 mi (2,464.25 km) |
| Port Glasgow to Kozloduy | 1,502.39 mi (2,417.86 km) |
| Port Glasgow to Kyustendil | 1,539.33 mi (2,477.31 km) |
| Port Glasgow to Levski | 1,572.81 mi (2,531.20 km) |
| Port Glasgow to Lom | 1,482.59 mi (2,386.00 km) |
| Port Glasgow to Lovech | 1,569.00 mi (2,525.06 km) |
| Port Glasgow to Lukovit | 1,546.10 mi (2,488.20 km) |
| Port Glasgow to Lyaskovets | 1,606.74 mi (2,585.79 km) |
| Port Glasgow to Mezdra | 1,531.89 mi (2,465.34 km) |
| Port Glasgow to Momchilgrad | 1,673.12 mi (2,692.63 km) |
