| Kotka to Smolyan | 1,308.16 mi (2,105.29 km) |
| Kotka to Sofia | 1,236.86 mi (1,990.53 km) |
| Kotka to Sopot | 1,234.44 mi (1,986.64 km) |
| Kotka to Sozopol | 1,247.54 mi (2,007.72 km) |
| Kotka to Sredets | 1,251.79 mi (2,014.56 km) |
| Kotka to Stamboliyski | 1,270.77 mi (2,045.11 km) |
| Kotka to Stara Zagora | 1,247.17 mi (2,007.12 km) |
| Kotka to Svilengrad | 1,292.43 mi (2,079.96 km) |
| Kotka to Svishtov | 1,166.10 mi (1,876.66 km) |
| Kotka to Targovishte | 1,189.65 mi (1,914.56 km) |
| Kotka to Teteven | 1,217.74 mi (1,959.77 km) |
| Kotka to Troyan | 1,218.46 mi (1,960.92 km) |
| Kotka to Tryavna | 1,217.52 mi (1,959.42 km) |
| Kotka to Tutrakan | 1,134.36 mi (1,825.58 km) |
| Kotka to Varna | 1,192.55 mi (1,919.23 km) |
