| Gengenbach to Smolyan | 938.56 mi (1,510.47 km) |
| Gengenbach to Sofia | 836.99 mi (1,347.01 km) |
| Gengenbach to Sopot | 899.61 mi (1,447.78 km) |
| Gengenbach to Sozopol | 1,036.61 mi (1,668.26 km) |
| Gengenbach to Sredets | 1,016.97 mi (1,636.66 km) |
| Gengenbach to Stamboliyski | 909.78 mi (1,464.15 km) |
| Gengenbach to Stara Zagora | 946.42 mi (1,523.11 km) |
| Gengenbach to Svilengrad | 995.04 mi (1,601.36 km) |
| Gengenbach to Svishtov | 892.58 mi (1,436.47 km) |
| Gengenbach to Targovishte | 959.11 mi (1,543.54 km) |
| Gengenbach to Teteven | 869.07 mi (1,398.64 km) |
| Gengenbach to Troyan | 889.74 mi (1,431.89 km) |
| Gengenbach to Tryavna | 924.39 mi (1,487.66 km) |
| Gengenbach to Tutrakan | 935.72 mi (1,505.89 km) |
| Gengenbach to Varna | 1,019.54 mi (1,640.79 km) |
