| Gladbeck to Smolyan | 1,083.68 mi (1,744.02 km) |
| Gladbeck to Sofia | 979.50 mi (1,576.36 km) |
| Gladbeck to Sopot | 1,034.20 mi (1,664.39 km) |
| Gladbeck to Sozopol | 1,157.52 mi (1,862.85 km) |
| Gladbeck to Sredets | 1,141.13 mi (1,836.47 km) |
| Gladbeck to Stamboliyski | 1,050.77 mi (1,691.05 km) |
| Gladbeck to Stara Zagora | 1,078.11 mi (1,735.05 km) |
| Gladbeck to Svilengrad | 1,130.09 mi (1,818.71 km) |
| Gladbeck to Svishtov | 1,013.24 mi (1,630.65 km) |
| Gladbeck to Targovishte | 1,077.22 mi (1,733.62 km) |
| Gladbeck to Teteven | 1,003.69 mi (1,615.28 km) |
| Gladbeck to Troyan | 1,022.09 mi (1,644.89 km) |
| Gladbeck to Tryavna | 1,052.48 mi (1,693.80 km) |
| Gladbeck to Tutrakan | 1,044.58 mi (1,681.09 km) |
| Gladbeck to Varna | 1,131.19 mi (1,820.47 km) |
