| Billingham to Smolyan | 1,484.37 mi (2,388.86 km) |
| Billingham to Sofia | 1,380.13 mi (2,221.11 km) |
| Billingham to Sopot | 1,433.88 mi (2,307.61 km) |
| Billingham to Sozopol | 1,553.95 mi (2,500.84 km) |
| Billingham to Sredets | 1,538.44 mi (2,475.89 km) |
| Billingham to Stamboliyski | 1,451.16 mi (2,335.42 km) |
| Billingham to Stara Zagora | 1,477.20 mi (2,377.33 km) |
| Billingham to Svilengrad | 1,529.58 mi (2,461.62 km) |
| Billingham to Svishtov | 1,410.38 mi (2,269.78 km) |
| Billingham to Targovishte | 1,473.35 mi (2,371.12 km) |
| Billingham to Teteven | 1,403.46 mi (2,258.65 km) |
| Billingham to Troyan | 1,421.47 mi (2,287.64 km) |
| Billingham to Tryavna | 1,451.01 mi (2,335.17 km) |
| Billingham to Tutrakan | 1,438.24 mi (2,314.63 km) |
| Billingham to Varna | 1,525.08 mi (2,454.37 km) |
