| Grenzach-Wyhlen to Smolyan | 931.99 mi (1,499.90 km) |
| Grenzach-Wyhlen to Sofia | 832.31 mi (1,339.47 km) |
| Grenzach-Wyhlen to Sopot | 897.31 mi (1,444.08 km) |
| Grenzach-Wyhlen to Sozopol | 1,038.08 mi (1,670.63 km) |
| Grenzach-Wyhlen to Sredets | 1,017.47 mi (1,637.45 km) |
| Grenzach-Wyhlen to Stamboliyski | 905.02 mi (1,456.48 km) |
| Grenzach-Wyhlen to Stara Zagora | 944.78 mi (1,520.48 km) |
| Grenzach-Wyhlen to Svilengrad | 991.82 mi (1,596.17 km) |
| Grenzach-Wyhlen to Svishtov | 895.30 mi (1,440.84 km) |
| Grenzach-Wyhlen to Targovishte | 962.12 mi (1,548.39 km) |
| Grenzach-Wyhlen to Teteven | 867.04 mi (1,395.37 km) |
| Grenzach-Wyhlen to Troyan | 888.34 mi (1,429.65 km) |
| Grenzach-Wyhlen to Tryavna | 924.23 mi (1,487.40 km) |
| Grenzach-Wyhlen to Tutrakan | 942.01 mi (1,516.02 km) |
| Grenzach-Wyhlen to Varna | 1,024.25 mi (1,648.38 km) |
