| Bothell West to Smolyan | 5,938.40 mi (9,556.93 km) |
| Bothell West to Sofia | 5,840.58 mi (9,399.50 km) |
| Bothell West to Sopot | 5,870.79 mi (9,448.12 km) |
| Bothell West to Sozopol | 5,938.79 mi (9,557.56 km) |
| Bothell West to Sredets | 5,934.46 mi (9,550.58 km) |
| Bothell West to Stamboliyski | 5,899.91 mi (9,494.98 km) |
| Bothell West to Stara Zagora | 5,901.36 mi (9,497.32 km) |
| Bothell West to Svilengrad | 5,954.43 mi (9,582.73 km) |
| Bothell West to Svishtov | 5,819.62 mi (9,365.78 km) |
| Bothell West to Targovishte | 5,865.30 mi (9,439.29 km) |
| Bothell West to Teteven | 5,844.60 mi (9,405.98 km) |
| Bothell West to Troyan | 5,855.18 mi (9,422.99 km) |
| Bothell West to Tryavna | 5,870.66 mi (9,447.92 km) |
| Bothell West to Tutrakan | 5,814.08 mi (9,356.86 km) |
| Bothell West to Varna | 5,890.43 mi (9,479.73 km) |
