| Horndean to Smolyan | 1,376.77 mi (2,215.70 km) |
| Horndean to Sofia | 1,274.73 mi (2,051.48 km) |
| Horndean to Sopot | 1,336.12 mi (2,150.28 km) |
| Horndean to Sozopol | 1,469.90 mi (2,365.58 km) |
| Horndean to Sredets | 1,451.20 mi (2,335.49 km) |
| Horndean to Stamboliyski | 1,347.46 mi (2,168.52 km) |
| Horndean to Stara Zagora | 1,382.43 mi (2,224.80 km) |
| Horndean to Svilengrad | 1,431.89 mi (2,304.41 km) |
| Horndean to Svishtov | 1,325.24 mi (2,132.76 km) |
| Horndean to Targovishte | 1,391.18 mi (2,238.88 km) |
| Horndean to Teteven | 1,305.50 mi (2,101.00 km) |
| Horndean to Troyan | 1,325.72 mi (2,133.55 km) |
| Horndean to Tryavna | 1,359.42 mi (2,187.78 km) |
| Horndean to Tutrakan | 1,364.09 mi (2,195.29 km) |
| Horndean to Varna | 1,449.43 mi (2,332.63 km) |
