| Troutdale to Smolyan | 6,084.51 mi (9,792.07 km) |
| Troutdale to Sofia | 5,986.17 mi (9,633.81 km) |
| Troutdale to Sopot | 6,017.33 mi (9,683.96 km) |
| Troutdale to Sozopol | 6,087.16 mi (9,796.33 km) |
| Troutdale to Sredets | 6,082.49 mi (9,788.82 km) |
| Troutdale to Stamboliyski | 6,046.11 mi (9,730.27 km) |
| Troutdale to Stara Zagora | 6,048.42 mi (9,733.99 km) |
| Troutdale to Svilengrad | 6,101.62 mi (9,819.61 km) |
| Troutdale to Svishtov | 5,966.90 mi (9,602.80 km) |
| Troutdale to Targovishte | 6,013.23 mi (9,677.36 km) |
| Troutdale to Teteven | 5,990.92 mi (9,641.45 km) |
| Troutdale to Troyan | 6,001.78 mi (9,658.93 km) |
| Troutdale to Tryavna | 6,017.78 mi (9,684.67 km) |
| Troutdale to Tutrakan | 5,962.30 mi (9,595.39 km) |
| Troutdale to Varna | 6,039.17 mi (9,719.11 km) |
