| Buckeye to Smolyan | 6,588.74 mi (10,603.55 km) |
| Buckeye to Sofia | 6,485.26 mi (10,437.02 km) |
| Buckeye to Sopot | 6,529.50 mi (10,508.21 km) |
| Buckeye to Sozopol | 6,625.73 mi (10,663.08 km) |
| Buckeye to Sredets | 6,615.88 mi (10,647.23 km) |
| Buckeye to Stamboliyski | 6,552.60 mi (10,545.39 km) |
| Buckeye to Stara Zagora | 6,567.63 mi (10,569.58 km) |
| Buckeye to Svilengrad | 6,621.59 mi (10,656.43 km) |
| Buckeye to Svishtov | 6,491.35 mi (10,446.82 km) |
| Buckeye to Targovishte | 6,546.69 mi (10,535.89 km) |
| Buckeye to Teteven | 6,500.40 mi (10,461.38 km) |
| Buckeye to Troyan | 6,515.26 mi (10,485.30 km) |
| Buckeye to Tryavna | 6,538.52 mi (10,522.73 km) |
| Buckeye to Tutrakan | 6,501.32 mi (10,462.86 km) |
| Buckeye to Varna | 6,584.86 mi (10,597.30 km) |
