| Heerlen to Smolyan | 1,096.29 mi (1,764.31 km) |
| Heerlen to Sofia | 992.61 mi (1,597.45 km) |
| Heerlen to Sopot | 1,050.11 mi (1,689.99 km) |
| Heerlen to Sozopol | 1,178.11 mi (1,895.99 km) |
| Heerlen to Sredets | 1,160.68 mi (1,867.94 km) |
| Heerlen to Stamboliyski | 1,064.65 mi (1,713.39 km) |
| Heerlen to Stara Zagora | 1,095.11 mi (1,762.40 km) |
| Heerlen to Svilengrad | 1,146.19 mi (1,844.61 km) |
| Heerlen to Svishtov | 1,033.38 mi (1,663.06 km) |
| Heerlen to Targovishte | 1,098.37 mi (1,767.66 km) |
| Heerlen to Teteven | 1,019.47 mi (1,640.68 km) |
| Heerlen to Troyan | 1,038.67 mi (1,671.57 km) |
| Heerlen to Tryavna | 1,070.51 mi (1,722.82 km) |
| Heerlen to Tutrakan | 1,068.29 mi (1,719.24 km) |
| Heerlen to Varna | 1,154.42 mi (1,857.86 km) |
