| Gronau to Smolyan | 1,105.71 mi (1,779.47 km) |
| Gronau to Sofia | 1,001.41 mi (1,611.62 km) |
| Gronau to Sopot | 1,054.22 mi (1,696.60 km) |
| Gronau to Sozopol | 1,174.19 mi (1,889.67 km) |
| Gronau to Sredets | 1,158.53 mi (1,864.47 km) |
| Gronau to Stamboliyski | 1,072.05 mi (1,725.30 km) |
| Gronau to Stara Zagora | 1,097.33 mi (1,765.99 km) |
| Gronau to Svilengrad | 1,149.82 mi (1,850.45 km) |
| Gronau to Svishtov | 1,030.47 mi (1,658.39 km) |
| Gronau to Targovishte | 1,093.63 mi (1,760.03 km) |
| Gronau to Teteven | 1,023.85 mi (1,647.72 km) |
| Gronau to Troyan | 1,041.69 mi (1,676.44 km) |
| Gronau to Tryavna | 1,071.06 mi (1,723.70 km) |
| Gronau to Tutrakan | 1,059.24 mi (1,704.69 km) |
| Gronau to Varna | 1,146.03 mi (1,844.36 km) |
