| Southport to Smolyan | 1,521.13 mi (2,448.03 km) |
| Southport to Sofia | 1,417.34 mi (2,280.99 km) |
| Southport to Sopot | 1,474.05 mi (2,372.25 km) |
| Southport to Sozopol | 1,599.29 mi (2,573.81 km) |
| Southport to Sredets | 1,582.64 mi (2,547.01 km) |
| Southport to Stamboliyski | 1,489.24 mi (2,396.71 km) |
| Southport to Stara Zagora | 1,518.57 mi (2,443.91 km) |
| Southport to Svilengrad | 1,570.09 mi (2,526.81 km) |
| Southport to Svishtov | 1,454.87 mi (2,341.38 km) |
| Southport to Targovishte | 1,519.07 mi (2,444.70 km) |
| Southport to Teteven | 1,443.44 mi (2,323.00 km) |
| Southport to Troyan | 1,462.31 mi (2,353.36 km) |
| Southport to Tryavna | 1,493.41 mi (2,403.42 km) |
| Southport to Tutrakan | 1,486.52 mi (2,392.33 km) |
| Southport to Varna | 1,573.15 mi (2,531.74 km) |
