| Halstead to Smolyan | 1,335.47 mi (2,149.23 km) |
| Halstead to Sofia | 1,232.15 mi (1,982.95 km) |
| Halstead to Sopot | 1,290.67 mi (2,077.13 km) |
| Halstead to Sozopol | 1,419.59 mi (2,284.61 km) |
| Halstead to Sredets | 1,402.04 mi (2,256.36 km) |
| Halstead to Stamboliyski | 1,304.45 mi (2,099.30 km) |
| Halstead to Stara Zagora | 1,335.95 mi (2,150.01 km) |
| Halstead to Svilengrad | 1,386.74 mi (2,231.74 km) |
| Halstead to Svishtov | 1,274.83 mi (2,051.64 km) |
| Halstead to Targovishte | 1,339.90 mi (2,156.35 km) |
| Halstead to Teteven | 1,260.01 mi (2,027.79 km) |
| Halstead to Troyan | 1,279.43 mi (2,059.05 km) |
| Halstead to Tryavna | 1,311.62 mi (2,110.85 km) |
| Halstead to Tutrakan | 1,309.76 mi (2,107.86 km) |
| Halstead to Varna | 1,395.94 mi (2,246.55 km) |
