| Cities | Distance |
|---|
| Regen to Smolyan | 757.76 mi (1,219.50 km) |
| Regen to Sofia | 653.53 mi (1,051.76 km) |
| Regen to Sopot | 708.26 mi (1,139.83 km) |
| Regen to Sozopol | 833.95 mi (1,342.11 km) |
| Regen to Sredets | 816.79 mi (1,314.50 km) |
| Regen to Stamboliyski | 724.69 mi (1,166.27 km) |
| Regen to Stara Zagora | 752.47 mi (1,210.98 km) |
| Regen to Svilengrad | 804.21 mi (1,294.26 km) |
| Regen to Svishtov | 689.27 mi (1,109.28 km) |
| Regen to Targovishte | 754.10 mi (1,213.60 km) |
| Regen to Teteven | 677.71 mi (1,090.68 km) |
| Regen to Troyan | 696.30 mi (1,120.58 km) |
| Regen to Tryavna | 727.24 mi (1,170.38 km) |
| Regen to Tutrakan | 724.17 mi (1,165.44 km) |
| Regen to Varna | 810.18 mi (1,303.86 km) |
