| Twickenham to Smolyan | 1,361.85 mi (2,191.69 km) |
| Twickenham to Sofia | 1,259.13 mi (2,026.38 km) |
| Twickenham to Sopot | 1,319.18 mi (2,123.02 km) |
| Twickenham to Sozopol | 1,450.68 mi (2,334.64 km) |
| Twickenham to Sredets | 1,432.53 mi (2,305.44 km) |
| Twickenham to Stamboliyski | 1,331.70 mi (2,143.16 km) |
| Twickenham to Stara Zagora | 1,365.02 mi (2,196.79 km) |
| Twickenham to Svilengrad | 1,415.15 mi (2,277.47 km) |
| Twickenham to Svishtov | 1,305.89 mi (2,101.63 km) |
| Twickenham to Targovishte | 1,371.44 mi (2,207.13 km) |
| Twickenham to Teteven | 1,288.52 mi (2,073.68 km) |
| Twickenham to Troyan | 1,308.37 mi (2,105.62 km) |
| Twickenham to Tryavna | 1,341.36 mi (2,158.71 km) |
| Twickenham to Tutrakan | 1,342.86 mi (2,161.12 km) |
| Twickenham to Varna | 1,428.65 mi (2,299.19 km) |
