| Washougal to Smolyan | 6,080.66 mi (9,785.87 km) |
| Washougal to Sofia | 5,982.31 mi (9,627.60 km) |
| Washougal to Sopot | 6,013.49 mi (9,677.77 km) |
| Washougal to Sozopol | 6,083.35 mi (9,790.20 km) |
| Washougal to Sredets | 6,078.67 mi (9,782.68 km) |
| Washougal to Stamboliyski | 6,042.26 mi (9,724.08 km) |
| Washougal to Stara Zagora | 6,044.59 mi (9,727.82 km) |
| Washougal to Svilengrad | 6,097.79 mi (9,813.45 km) |
| Washougal to Svishtov | 5,963.07 mi (9,596.64 km) |
| Washougal to Targovishte | 6,009.41 mi (9,671.22 km) |
| Washougal to Teteven | 5,987.07 mi (9,635.26 km) |
| Washougal to Troyan | 5,997.94 mi (9,652.75 km) |
| Washougal to Tryavna | 6,013.94 mi (9,678.51 km) |
| Washougal to Tutrakan | 5,958.49 mi (9,589.26 km) |
| Washougal to Varna | 6,035.37 mi (9,712.99 km) |
