| Kennewick to Smolyan | 5,977.41 mi (9,619.72 km) |
| Kennewick to Sofia | 5,878.06 mi (9,459.82 km) |
| Kennewick to Sopot | 5,911.20 mi (9,513.16 km) |
| Kennewick to Sozopol | 5,985.18 mi (9,632.22 km) |
| Kennewick to Sredets | 5,979.71 mi (9,623.41 km) |
| Kennewick to Stamboliyski | 5,939.23 mi (9,558.27 km) |
| Kennewick to Stara Zagora | 5,943.42 mi (9,565.00 km) |
| Kennewick to Svilengrad | 5,996.88 mi (9,651.05 km) |
| Kennewick to Svishtov | 5,862.45 mi (9,434.70 km) |
| Kennewick to Targovishte | 5,910.27 mi (9,511.66 km) |
| Kennewick to Teteven | 5,884.32 mi (9,469.90 km) |
| Kennewick to Troyan | 5,895.80 mi (9,488.37 km) |
| Kennewick to Tryavna | 5,912.91 mi (9,515.91 km) |
| Kennewick to Tutrakan | 5,860.04 mi (9,430.82 km) |
| Kennewick to Varna | 5,938.16 mi (9,556.54 km) |
