| Houthulst to Sofia | 1,114.70 mi (1,793.94 km) |
| Houthulst to Sopot | 1,174.12 mi (1,889.57 km) |
| Houthulst to Sozopol | 1,304.93 mi (2,100.08 km) |
| Houthulst to Sredets | 1,286.90 mi (2,071.06 km) |
| Houthulst to Stamboliyski | 1,187.16 mi (1,910.55 km) |
| Houthulst to Stara Zagora | 1,219.77 mi (1,963.04 km) |
| Houthulst to Svilengrad | 1,270.14 mi (2,044.10 km) |
| Houthulst to Svishtov | 1,160.14 mi (1,867.06 km) |
| Houthulst to Targovishte | 1,225.62 mi (1,972.44 km) |
| Houthulst to Teteven | 1,143.46 mi (1,840.22 km) |
| Houthulst to Troyan | 1,163.16 mi (1,871.93 km) |
| Houthulst to Tryavna | 1,195.91 mi (1,924.63 km) |
| Houthulst to Tutrakan | 1,196.91 mi (1,926.24 km) |
| Houthulst to Varna | 1,282.72 mi (2,064.33 km) |
| Houthulst to Veliki Preslav | 1,238.59 mi (1,993.32 km) |
