| Hartlepool to Smolyan | 1,484.71 mi (2,389.41 km) |
| Hartlepool to Sofia | 1,380.46 mi (2,221.63 km) |
| Hartlepool to Sopot | 1,434.00 mi (2,307.80 km) |
| Hartlepool to Sozopol | 1,553.69 mi (2,500.42 km) |
| Hartlepool to Sredets | 1,538.26 mi (2,475.59 km) |
| Hartlepool to Stamboliyski | 1,451.42 mi (2,335.83 km) |
| Hartlepool to Stara Zagora | 1,477.23 mi (2,377.37 km) |
| Hartlepool to Svilengrad | 1,529.66 mi (2,461.75 km) |
| Hartlepool to Svishtov | 1,410.19 mi (2,269.49 km) |
| Hartlepool to Targovishte | 1,473.07 mi (2,370.67 km) |
| Hartlepool to Teteven | 1,403.59 mi (2,258.86 km) |
| Hartlepool to Troyan | 1,421.54 mi (2,287.75 km) |
| Hartlepool to Tryavna | 1,450.97 mi (2,335.10 km) |
| Hartlepool to Tutrakan | 1,437.78 mi (2,313.89 km) |
| Hartlepool to Varna | 1,524.62 mi (2,453.64 km) |
