| Sonsbeck to Smolyan | 1,106.69 mi (1,781.05 km) |
| Sonsbeck to Sofia | 1,002.57 mi (1,613.48 km) |
| Sonsbeck to Sopot | 1,057.75 mi (1,702.28 km) |
| Sonsbeck to Sozopol | 1,181.77 mi (1,901.87 km) |
| Sonsbeck to Sredets | 1,165.23 mi (1,875.26 km) |
| Sonsbeck to Stamboliyski | 1,073.98 mi (1,728.41 km) |
| Sonsbeck to Stara Zagora | 1,101.83 mi (1,773.23 km) |
| Sonsbeck to Svilengrad | 1,153.69 mi (1,856.68 km) |
| Sonsbeck to Svishtov | 1,037.40 mi (1,669.53 km) |
| Sonsbeck to Targovishte | 1,101.52 mi (1,772.73 km) |
| Sonsbeck to Teteven | 1,027.21 mi (1,653.13 km) |
| Sonsbeck to Troyan | 1,045.73 mi (1,682.95 km) |
| Sonsbeck to Tryavna | 1,076.35 mi (1,732.21 km) |
| Sonsbeck to Tutrakan | 1,069.19 mi (1,720.69 km) |
| Sonsbeck to Varna | 1,155.75 mi (1,860.00 km) |
