| Eugene to Smolyan | 6,192.41 mi (9,965.73 km) |
| Eugene to Sofia | 6,093.99 mi (9,807.33 km) |
| Eugene to Sopot | 6,125.30 mi (9,857.72 km) |
| Eugene to Sozopol | 6,195.33 mi (9,970.43 km) |
| Eugene to Sredets | 6,190.63 mi (9,962.86 km) |
| Eugene to Stamboliyski | 6,154.03 mi (9,903.95 km) |
| Eugene to Stara Zagora | 6,156.46 mi (9,907.86 km) |
| Eugene to Svilengrad | 6,209.68 mi (9,993.51 km) |
| Eugene to Svishtov | 6,074.97 mi (9,776.72 km) |
| Eugene to Targovishte | 6,121.37 mi (9,851.39 km) |
| Eugene to Teteven | 6,098.86 mi (9,815.16 km) |
| Eugene to Troyan | 6,109.76 mi (9,832.71 km) |
| Eugene to Tryavna | 6,125.82 mi (9,858.56 km) |
| Eugene to Tutrakan | 6,070.46 mi (9,769.46 km) |
| Eugene to Varna | 6,147.38 mi (9,893.24 km) |
