| Seinajoki to Smolyan | 1,467.33 mi (2,361.43 km) |
| Seinajoki to Sofia | 1,388.34 mi (2,234.32 km) |
| Seinajoki to Sopot | 1,393.80 mi (2,243.10 km) |
| Seinajoki to Sozopol | 1,421.50 mi (2,287.69 km) |
| Seinajoki to Sredets | 1,423.42 mi (2,290.77 km) |
| Seinajoki to Stamboliyski | 1,429.01 mi (2,299.78 km) |
| Seinajoki to Stara Zagora | 1,411.23 mi (2,271.16 km) |
| Seinajoki to Svilengrad | 1,459.14 mi (2,348.25 km) |
| Seinajoki to Svishtov | 1,328.68 mi (2,138.31 km) |
| Seinajoki to Targovishte | 1,358.58 mi (2,186.42 km) |
| Seinajoki to Teteven | 1,374.43 mi (2,211.94 km) |
| Seinajoki to Troyan | 1,377.62 mi (2,217.07 km) |
| Seinajoki to Tryavna | 1,380.85 mi (2,222.27 km) |
| Seinajoki to Tutrakan | 1,303.68 mi (2,098.07 km) |
| Seinajoki to Varna | 1,367.85 mi (2,201.35 km) |
