| Kouvola to Smolyan | 1,335.12 mi (2,148.66 km) |
| Kouvola to Sofia | 1,263.14 mi (2,032.84 km) |
| Kouvola to Sopot | 1,261.38 mi (2,030.00 km) |
| Kouvola to Sozopol | 1,275.55 mi (2,052.79 km) |
| Kouvola to Sredets | 1,279.64 mi (2,059.39 km) |
| Kouvola to Stamboliyski | 1,297.64 mi (2,088.35 km) |
| Kouvola to Stara Zagora | 1,274.48 mi (2,051.08 km) |
| Kouvola to Svilengrad | 1,319.95 mi (2,124.25 km) |
| Kouvola to Svishtov | 1,193.27 mi (1,920.38 km) |
| Kouvola to Targovishte | 1,217.30 mi (1,959.06 km) |
| Kouvola to Teteven | 1,244.46 mi (2,002.76 km) |
| Kouvola to Troyan | 1,245.38 mi (2,004.24 km) |
| Kouvola to Tryavna | 1,244.77 mi (2,003.27 km) |
| Kouvola to Tutrakan | 1,162.02 mi (1,870.10 km) |
| Kouvola to Varna | 1,220.63 mi (1,964.41 km) |
