| Kouvola to Karlovo | 1,261.67 mi (2,030.47 km) |
| Kouvola to Karnobat | 1,259.96 mi (2,027.70 km) |
| Kouvola to Kavarna | 1,206.51 mi (1,941.70 km) |
| Kouvola to Kazanlak | 1,262.22 mi (2,031.35 km) |
| Kouvola to Knezha | 1,204.91 mi (1,939.11 km) |
| Kouvola to Kostinbrod | 1,255.65 mi (2,020.78 km) |
| Kouvola to Kozloduy | 1,186.79 mi (1,909.96 km) |
| Kouvola to Kyustendil | 1,295.05 mi (2,084.18 km) |
| Kouvola to Levski | 1,210.98 mi (1,948.88 km) |
| Kouvola to Lom | 1,186.17 mi (1,908.96 km) |
| Kouvola to Lovech | 1,228.03 mi (1,976.33 km) |
| Kouvola to Lukovit | 1,225.28 mi (1,971.89 km) |
| Kouvola to Lyaskovets | 1,228.34 mi (1,976.82 km) |
| Kouvola to Mezdra | 1,230.54 mi (1,980.36 km) |
| Kouvola to Momchilgrad | 1,337.00 mi (2,151.70 km) |
