| Broxbourne to Smolyan | 1,356.57 mi (2,183.19 km) |
| Broxbourne to Sofia | 1,253.53 mi (2,017.36 km) |
| Broxbourne to Sopot | 1,312.80 mi (2,112.75 km) |
| Broxbourne to Sozopol | 1,442.97 mi (2,322.24 km) |
| Broxbourne to Sredets | 1,425.14 mi (2,293.54 km) |
| Broxbourne to Stamboliyski | 1,325.97 mi (2,133.94 km) |
| Broxbourne to Stara Zagora | 1,358.36 mi (2,186.07 km) |
| Broxbourne to Svilengrad | 1,408.84 mi (2,267.31 km) |
| Broxbourne to Svishtov | 1,298.18 mi (2,089.23 km) |
| Broxbourne to Targovishte | 1,363.49 mi (2,194.32 km) |
| Broxbourne to Teteven | 1,282.14 mi (2,063.41 km) |
| Broxbourne to Troyan | 1,301.77 mi (2,095.00 km) |
| Broxbourne to Tryavna | 1,334.35 mi (2,147.43 km) |
| Broxbourne to Tutrakan | 1,334.07 mi (2,146.98 km) |
| Broxbourne to Varna | 1,420.08 mi (2,285.40 km) |
