| Houma to Smolyan | 6,026.13 mi (9,698.13 km) |
| Houma to Sofia | 5,923.43 mi (9,532.84 km) |
| Houma to Sopot | 5,982.64 mi (9,628.12 km) |
| Houma to Sozopol | 6,109.36 mi (9,832.06 km) |
| Houma to Sredets | 6,092.74 mi (9,805.32 km) |
| Houma to Stamboliyski | 5,995.95 mi (9,649.54 km) |
| Houma to Stara Zagora | 6,027.84 mi (9,700.86 km) |
| Houma to Svilengrad | 6,078.71 mi (9,782.73 km) |
| Houma to Svishtov | 5,964.98 mi (9,599.71 km) |
| Houma to Targovishte | 6,029.05 mi (9,702.82 km) |
| Houma to Teteven | 5,951.98 mi (9,578.79 km) |
| Houma to Troyan | 5,971.36 mi (9,609.97 km) |
| Houma to Tryavna | 6,003.17 mi (9,661.16 km) |
| Houma to Tutrakan | 5,995.33 mi (9,648.55 km) |
| Houma to Varna | 6,082.13 mi (9,788.24 km) |
