| Erkelenz to Smolyan | 1,090.38 mi (1,754.80 km) |
| Erkelenz to Sofia | 986.51 mi (1,587.63 km) |
| Erkelenz to Sopot | 1,043.18 mi (1,678.83 km) |
| Erkelenz to Sozopol | 1,169.80 mi (1,882.62 km) |
| Erkelenz to Sredets | 1,152.68 mi (1,855.06 km) |
| Erkelenz to Stamboliyski | 1,058.34 mi (1,703.24 km) |
| Erkelenz to Stara Zagora | 1,087.86 mi (1,750.74 km) |
| Erkelenz to Svilengrad | 1,139.23 mi (1,833.42 km) |
| Erkelenz to Svishtov | 1,025.16 mi (1,649.83 km) |
| Erkelenz to Targovishte | 1,089.87 mi (1,753.98 km) |
| Erkelenz to Teteven | 1,012.57 mi (1,629.57 km) |
| Erkelenz to Troyan | 1,031.52 mi (1,660.08 km) |
| Erkelenz to Tryavna | 1,062.94 mi (1,710.63 km) |
| Erkelenz to Tutrakan | 1,059.01 mi (1,704.31 km) |
| Erkelenz to Varna | 1,145.31 mi (1,843.20 km) |
