| Kouvola to Devnya | 1,220.12 mi (1,963.59 km) |
| Kouvola to Dimitrovgrad | 1,301.03 mi (2,093.80 km) |
| Kouvola to Dobrich | 1,196.32 mi (1,925.29 km) |
| Kouvola to Dospat | 1,332.13 mi (2,143.85 km) |
| Kouvola to Dupnitsa | 1,294.07 mi (2,082.61 km) |
| Kouvola to Elhovo | 1,292.15 mi (2,079.52 km) |
| Kouvola to Etropole | 1,251.16 mi (2,013.54 km) |
| Kouvola to Gabrovo | 1,245.08 mi (2,003.77 km) |
| Kouvola to Gorna Oryahovitsa | 1,226.06 mi (1,973.16 km) |
| Kouvola to Gotse Delchev | 1,339.45 mi (2,155.63 km) |
| Kouvola to Harmanli | 1,308.70 mi (2,106.15 km) |
| Kouvola to Haskovo | 1,309.14 mi (2,106.85 km) |
| Kouvola to Ihtiman | 1,279.14 mi (2,058.57 km) |
| Kouvola to Isperih | 1,185.06 mi (1,907.17 km) |
| Kouvola to Kardzhali | 1,329.03 mi (2,138.87 km) |
