| Spencer to Smolyan | 5,492.93 mi (8,840.02 km) |
| Spencer to Sofia | 5,388.68 mi (8,672.25 km) |
| Spencer to Sopot | 5,438.22 mi (8,751.96 km) |
| Spencer to Sozopol | 5,545.83 mi (8,925.16 km) |
| Spencer to Sredets | 5,533.52 mi (8,905.34 km) |
| Spencer to Stamboliyski | 5,458.35 mi (8,784.37 km) |
| Spencer to Stara Zagora | 5,479.09 mi (8,817.74 km) |
| Spencer to Svilengrad | 5,532.57 mi (8,903.81 km) |
| Spencer to Svishtov | 5,406.56 mi (8,701.02 km) |
| Spencer to Targovishte | 5,465.51 mi (8,795.88 km) |
| Spencer to Teteven | 5,408.31 mi (8,703.83 km) |
| Spencer to Troyan | 5,424.81 mi (8,730.39 km) |
| Spencer to Tryavna | 5,451.17 mi (8,772.81 km) |
| Spencer to Tutrakan | 5,423.75 mi (8,728.68 km) |
| Spencer to Varna | 5,509.36 mi (8,866.46 km) |
