| Krefeld to Smolyan | 1,089.81 mi (1,753.89 km) |
| Krefeld to Sofia | 985.77 mi (1,586.45 km) |
| Krefeld to Sopot | 1,041.52 mi (1,676.17 km) |
| Krefeld to Sozopol | 1,166.60 mi (1,877.46 km) |
| Krefeld to Sredets | 1,149.82 mi (1,850.46 km) |
| Krefeld to Stamboliyski | 1,057.35 mi (1,701.64 km) |
| Krefeld to Stara Zagora | 1,085.84 mi (1,747.50 km) |
| Krefeld to Svilengrad | 1,137.52 mi (1,830.66 km) |
| Krefeld to Svishtov | 1,022.10 mi (1,644.90 km) |
| Krefeld to Targovishte | 1,086.47 mi (1,748.51 km) |
| Krefeld to Teteven | 1,010.95 mi (1,626.97 km) |
| Krefeld to Troyan | 1,029.65 mi (1,657.06 km) |
| Krefeld to Tryavna | 1,060.58 mi (1,706.84 km) |
| Krefeld to Tutrakan | 1,054.75 mi (1,697.45 km) |
| Krefeld to Varna | 1,141.21 mi (1,836.61 km) |
