| Hwlffordd to Smolyan | 1,558.55 mi (2,508.24 km) |
| Hwlffordd to Sofia | 1,456.33 mi (2,343.74 km) |
| Hwlffordd to Sopot | 1,517.29 mi (2,441.85 km) |
| Hwlffordd to Sozopol | 1,649.99 mi (2,655.40 km) |
| Hwlffordd to Sredets | 1,631.59 mi (2,625.80 km) |
| Hwlffordd to Stamboliyski | 1,529.02 mi (2,460.72 km) |
| Hwlffordd to Stara Zagora | 1,563.42 mi (2,516.07 km) |
| Hwlffordd to Svilengrad | 1,613.15 mi (2,596.11 km) |
| Hwlffordd to Svishtov | 1,505.23 mi (2,422.44 km) |
| Hwlffordd to Targovishte | 1,570.94 mi (2,528.18 km) |
| Hwlffordd to Teteven | 1,486.65 mi (2,392.54 km) |
| Hwlffordd to Troyan | 1,506.73 mi (2,424.85 km) |
| Hwlffordd to Tryavna | 1,540.11 mi (2,478.57 km) |
| Hwlffordd to Tutrakan | 1,542.79 mi (2,482.88 km) |
| Hwlffordd to Varna | 1,628.48 mi (2,620.79 km) |
