| Hardenberg to Smolyan | 1,134.37 mi (1,825.60 km) |
| Hardenberg to Sofia | 1,030.07 mi (1,657.74 km) |
| Hardenberg to Sopot | 1,082.37 mi (1,741.90 km) |
| Hardenberg to Sozopol | 1,201.30 mi (1,933.30 km) |
| Hardenberg to Sredets | 1,185.88 mi (1,908.49 km) |
| Hardenberg to Stamboliyski | 1,100.53 mi (1,771.13 km) |
| Hardenberg to Stara Zagora | 1,125.25 mi (1,810.91 km) |
| Hardenberg to Svilengrad | 1,177.86 mi (1,895.59 km) |
| Hardenberg to Svishtov | 1,057.81 mi (1,702.38 km) |
| Hardenberg to Targovishte | 1,120.69 mi (1,803.57 km) |
| Hardenberg to Teteven | 1,052.04 mi (1,693.10 km) |
| Hardenberg to Troyan | 1,069.73 mi (1,721.56 km) |
| Hardenberg to Tryavna | 1,098.79 mi (1,768.34 km) |
| Hardenberg to Tutrakan | 1,085.73 mi (1,747.31 km) |
| Hardenberg to Varna | 1,172.55 mi (1,887.03 km) |
