| Galveston to Smolyan | 6,210.44 mi (9,994.73 km) |
| Galveston to Sofia | 6,107.03 mi (9,828.32 km) |
| Galveston to Sopot | 6,164.36 mi (9,920.57 km) |
| Galveston to Sozopol | 6,287.26 mi (10,118.36 km) |
| Galveston to Sredets | 6,271.56 mi (10,093.09 km) |
| Galveston to Stamboliyski | 6,179.20 mi (9,944.46 km) |
| Galveston to Stara Zagora | 6,208.76 mi (9,992.04 km) |
| Galveston to Svilengrad | 6,260.39 mi (10,075.12 km) |
| Galveston to Svishtov | 6,143.52 mi (9,887.05 km) |
| Galveston to Targovishte | 6,206.66 mi (9,988.65 km) |
| Galveston to Teteven | 6,133.75 mi (9,871.32 km) |
| Galveston to Troyan | 6,152.57 mi (9,901.61 km) |
| Galveston to Tryavna | 6,183.28 mi (9,951.03 km) |
| Galveston to Tutrakan | 6,170.97 mi (9,931.22 km) |
| Galveston to Varna | 6,257.80 mi (10,070.95 km) |
