| Seattle to Smolyan | 5,951.63 mi (9,578.23 km) |
| Seattle to Sofia | 5,853.80 mi (9,420.78 km) |
| Seattle to Sopot | 5,884.04 mi (9,469.44 km) |
| Seattle to Sozopol | 5,952.09 mi (9,578.96 km) |
| Seattle to Sredets | 5,947.74 mi (9,571.96 km) |
| Seattle to Stamboliyski | 5,913.15 mi (9,516.29 km) |
| Seattle to Stara Zagora | 5,914.62 mi (9,518.66 km) |
| Seattle to Svilengrad | 5,967.69 mi (9,604.08 km) |
| Seattle to Svishtov | 5,832.89 mi (9,387.13 km) |
| Seattle to Targovishte | 5,878.58 mi (9,460.66 km) |
| Seattle to Teteven | 5,857.85 mi (9,427.29 km) |
| Seattle to Troyan | 5,868.43 mi (9,444.32 km) |
| Seattle to Tryavna | 5,883.92 mi (9,469.26 km) |
| Seattle to Tutrakan | 5,827.37 mi (9,378.25 km) |
| Seattle to Varna | 5,903.73 mi (9,501.14 km) |
