| Walla Walla to Smolyan | 5,967.62 mi (9,603.96 km) |
| Walla Walla to Sofia | 5,867.95 mi (9,443.56 km) |
| Walla Walla to Sopot | 5,901.74 mi (9,497.93 km) |
| Walla Walla to Sozopol | 5,977.06 mi (9,619.14 km) |
| Walla Walla to Sredets | 5,971.32 mi (9,609.92 km) |
| Walla Walla to Stamboliyski | 5,929.52 mi (9,542.65 km) |
| Walla Walla to Stara Zagora | 5,934.32 mi (9,550.36 km) |
| Walla Walla to Svilengrad | 5,987.86 mi (9,636.53 km) |
| Walla Walla to Svishtov | 5,853.55 mi (9,420.37 km) |
| Walla Walla to Targovishte | 5,901.84 mi (9,498.09 km) |
| Walla Walla to Teteven | 5,874.72 mi (9,454.44 km) |
| Walla Walla to Troyan | 5,886.39 mi (9,473.23 km) |
| Walla Walla to Tryavna | 5,903.87 mi (9,501.36 km) |
| Walla Walla to Tutrakan | 5,851.85 mi (9,417.64 km) |
| Walla Walla to Varna | 5,930.35 mi (9,543.98 km) |
