| Lockhart to Smolyan | 6,284.61 mi (10,114.11 km) |
| Lockhart to Sofia | 6,180.75 mi (9,946.96 km) |
| Lockhart to Sopot | 6,236.28 mi (10,036.33 km) |
| Lockhart to Sozopol | 6,355.57 mi (10,228.30 km) |
| Lockhart to Sredets | 6,340.71 mi (10,204.39 km) |
| Lockhart to Stamboliyski | 6,252.48 mi (10,062.39 km) |
| Lockhart to Stara Zagora | 6,279.91 mi (10,106.54 km) |
| Lockhart to Svilengrad | 6,332.13 mi (10,190.57 km) |
| Lockhart to Svishtov | 6,212.66 mi (9,998.31 km) |
| Lockhart to Targovishte | 6,274.86 mi (10,098.41 km) |
| Lockhart to Teteven | 6,205.78 mi (9,987.24 km) |
| Lockhart to Troyan | 6,224.06 mi (10,016.66 km) |
| Lockhart to Tryavna | 6,253.75 mi (10,064.44 km) |
| Lockhart to Tutrakan | 6,237.49 mi (10,038.27 km) |
| Lockhart to Varna | 6,324.20 mi (10,177.81 km) |
