| Regensdorf to Smolyan | 893.81 mi (1,438.45 km) |
| Regensdorf to Sofia | 793.95 mi (1,277.75 km) |
| Regensdorf to Sopot | 858.83 mi (1,382.15 km) |
| Regensdorf to Sozopol | 999.51 mi (1,608.55 km) |
| Regensdorf to Sredets | 978.90 mi (1,575.39 km) |
| Regensdorf to Stamboliyski | 866.68 mi (1,394.79 km) |
| Regensdorf to Stara Zagora | 906.28 mi (1,458.51 km) |
| Regensdorf to Svilengrad | 953.39 mi (1,534.34 km) |
| Regensdorf to Svishtov | 856.72 mi (1,378.76 km) |
| Regensdorf to Targovishte | 923.55 mi (1,486.31 km) |
| Regensdorf to Teteven | 828.55 mi (1,333.42 km) |
| Regensdorf to Troyan | 849.83 mi (1,367.66 km) |
| Regensdorf to Tryavna | 885.68 mi (1,425.36 km) |
| Regensdorf to Tutrakan | 903.54 mi (1,454.11 km) |
| Regensdorf to Varna | 985.71 mi (1,586.35 km) |
