| Gloucester to Smolyan | 1,448.50 mi (2,331.14 km) |
| Gloucester to Sofia | 1,345.77 mi (2,165.81 km) |
| Gloucester to Sopot | 1,405.75 mi (2,262.34 km) |
| Gloucester to Sozopol | 1,536.93 mi (2,473.44 km) |
| Gloucester to Sredets | 1,518.88 mi (2,444.39 km) |
| Gloucester to Stamboliyski | 1,418.33 mi (2,282.59 km) |
| Gloucester to Stara Zagora | 1,451.54 mi (2,336.03 km) |
| Gloucester to Svilengrad | 1,501.73 mi (2,416.80 km) |
| Gloucester to Svishtov | 1,392.13 mi (2,240.42 km) |
| Gloucester to Targovishte | 1,457.60 mi (2,345.77 km) |
| Gloucester to Teteven | 1,375.09 mi (2,212.99 km) |
| Gloucester to Troyan | 1,394.90 mi (2,244.88 km) |
| Gloucester to Tryavna | 1,427.81 mi (2,297.83 km) |
| Gloucester to Tutrakan | 1,428.64 mi (2,299.18 km) |
| Gloucester to Varna | 1,514.54 mi (2,437.42 km) |
