| Union City to Smolyan | 6,576.82 mi (10,584.36 km) |
| Union City to Sofia | 6,476.52 mi (10,422.96 km) |
| Union City to Sopot | 6,511.60 mi (10,479.42 km) |
| Union City to Sozopol | 6,589.09 mi (10,604.11 km) |
| Union City to Sredets | 6,582.99 mi (10,594.29 km) |
| Union City to Stamboliyski | 6,538.89 mi (10,523.33 km) |
| Union City to Stara Zagora | 6,544.83 mi (10,532.89 km) |
| Union City to Svilengrad | 6,598.49 mi (10,619.24 km) |
| Union City to Svishtov | 6,464.42 mi (10,403.47 km) |
| Union City to Targovishte | 6,513.45 mi (10,482.38 km) |
| Union City to Teteven | 6,484.30 mi (10,435.48 km) |
| Union City to Troyan | 6,496.36 mi (10,454.88 km) |
| Union City to Tryavna | 6,514.48 mi (10,484.04 km) |
| Union City to Tutrakan | 6,463.81 mi (10,402.50 km) |
| Union City to Varna | 6,542.81 mi (10,529.63 km) |
