| Sittard to Smolyan | 1,104.62 mi (1,777.71 km) |
| Sittard to Sofia | 1,000.88 mi (1,610.76 km) |
| Sittard to Sopot | 1,058.17 mi (1,702.96 km) |
| Sittard to Sozopol | 1,185.78 mi (1,908.33 km) |
| Sittard to Sredets | 1,168.44 mi (1,880.43 km) |
| Sittard to Stamboliyski | 1,072.88 mi (1,726.63 km) |
| Sittard to Stara Zagora | 1,103.08 mi (1,775.24 km) |
| Sittard to Svilengrad | 1,154.25 mi (1,857.58 km) |
| Sittard to Svishtov | 1,041.07 mi (1,675.44 km) |
| Sittard to Targovishte | 1,105.98 mi (1,779.90 km) |
| Sittard to Teteven | 1,027.54 mi (1,653.66 km) |
| Sittard to Troyan | 1,046.67 mi (1,684.45 km) |
| Sittard to Tryavna | 1,078.39 mi (1,735.51 km) |
| Sittard to Tutrakan | 1,075.64 mi (1,731.08 km) |
| Sittard to Varna | 1,161.83 mi (1,869.79 km) |
