| Seaham to Smolyan | 1,494.02 mi (2,404.39 km) |
| Seaham to Sofia | 1,389.76 mi (2,236.60 km) |
| Seaham to Sopot | 1,443.05 mi (2,322.36 km) |
| Seaham to Sozopol | 1,562.26 mi (2,514.21 km) |
| Seaham to Sredets | 1,546.94 mi (2,489.56 km) |
| Seaham to Stamboliyski | 1,460.63 mi (2,350.66 km) |
| Seaham to Stara Zagora | 1,486.17 mi (2,391.76 km) |
| Seaham to Svilengrad | 1,538.66 mi (2,476.24 km) |
| Seaham to Svishtov | 1,418.87 mi (2,283.45 km) |
| Seaham to Targovishte | 1,481.62 mi (2,384.43 km) |
| Seaham to Teteven | 1,412.66 mi (2,273.46 km) |
| Seaham to Troyan | 1,430.54 mi (2,302.23 km) |
| Seaham to Tryavna | 1,459.82 mi (2,349.36 km) |
| Seaham to Tutrakan | 1,446.10 mi (2,327.27 km) |
| Seaham to Varna | 1,532.94 mi (2,467.02 km) |
