| Houghton le Spring to Smolyan | 1,498.59 mi (2,411.75 km) |
| Houghton le Spring to Sofia | 1,394.33 mi (2,243.96 km) |
| Houghton le Spring to Sopot | 1,447.70 mi (2,329.85 km) |
| Houghton le Spring to Sozopol | 1,567.03 mi (2,521.90 km) |
| Houghton le Spring to Sredets | 1,551.69 mi (2,497.21 km) |
| Houghton le Spring to Stamboliyski | 1,465.24 mi (2,358.07 km) |
| Houghton le Spring to Stara Zagora | 1,490.85 mi (2,399.30 km) |
| Houghton le Spring to Svilengrad | 1,543.33 mi (2,483.75 km) |
| Houghton le Spring to Svishtov | 1,423.62 mi (2,291.10 km) |
| Houghton le Spring to Targovishte | 1,486.40 mi (2,392.13 km) |
| Houghton le Spring to Teteven | 1,417.31 mi (2,280.94 km) |
| Houghton le Spring to Troyan | 1,435.21 mi (2,309.74 km) |
| Houghton le Spring to Tryavna | 1,464.53 mi (2,356.93 km) |
| Houghton le Spring to Tutrakan | 1,450.93 mi (2,335.04 km) |
| Houghton le Spring to Varna | 1,537.77 mi (2,474.79 km) |
