| Unna to Smolyan | 1,056.52 mi (1,700.31 km) |
| Unna to Sofia | 952.28 mi (1,532.54 km) |
| Unna to Sopot | 1,006.28 mi (1,619.45 km) |
| Unna to Sozopol | 1,128.57 mi (1,816.25 km) |
| Unna to Sredets | 1,112.38 mi (1,790.20 km) |
| Unna to Stamboliyski | 1,023.31 mi (1,646.86 km) |
| Unna to Stara Zagora | 1,049.92 mi (1,689.69 km) |
| Unna to Svilengrad | 1,102.08 mi (1,773.63 km) |
| Unna to Svishtov | 984.42 mi (1,584.27 km) |
| Unna to Targovishte | 1,048.18 mi (1,686.89 km) |
| Unna to Teteven | 975.81 mi (1,570.42 km) |
| Unna to Troyan | 994.02 mi (1,599.72 km) |
| Unna to Tryavna | 1,024.08 mi (1,648.09 km) |
| Unna to Tutrakan | 1,015.09 mi (1,633.63 km) |
| Unna to Varna | 1,101.75 mi (1,773.10 km) |
