| Bolton to Smolyan | 1,497.45 mi (2,409.91 km) |
| Bolton to Sofia | 1,393.63 mi (2,242.83 km) |
| Bolton to Sopot | 1,450.21 mi (2,333.88 km) |
| Bolton to Sozopol | 1,575.28 mi (2,535.18 km) |
| Bolton to Sredets | 1,558.67 mi (2,508.43 km) |
| Bolton to Stamboliyski | 1,465.50 mi (2,358.49 km) |
| Bolton to Stara Zagora | 1,494.69 mi (2,405.47 km) |
| Bolton to Svilengrad | 1,546.24 mi (2,488.43 km) |
| Bolton to Svishtov | 1,430.88 mi (2,302.77 km) |
| Bolton to Targovishte | 1,495.05 mi (2,406.05 km) |
| Bolton to Teteven | 1,419.61 mi (2,284.64 km) |
| Bolton to Troyan | 1,438.44 mi (2,314.95 km) |
| Bolton to Tryavna | 1,469.49 mi (2,364.92 km) |
| Bolton to Tutrakan | 1,462.45 mi (2,353.59 km) |
| Bolton to Varna | 1,549.09 mi (2,493.01 km) |
