| Piqua to Smolyan | 5,249.35 mi (8,448.01 km) |
| Piqua to Sofia | 5,145.69 mi (8,281.19 km) |
| Piqua to Sopot | 5,202.19 mi (8,372.12 km) |
| Piqua to Sozopol | 5,323.84 mi (8,567.89 km) |
| Piqua to Sredets | 5,308.39 mi (8,543.02 km) |
| Piqua to Stamboliyski | 5,217.65 mi (8,397.00 km) |
| Piqua to Stara Zagora | 5,246.29 mi (8,443.09 km) |
| Piqua to Svilengrad | 5,298.17 mi (8,526.57 km) |
| Piqua to Svishtov | 5,180.32 mi (8,336.93 km) |
| Piqua to Targovishte | 5,243.19 mi (8,438.11 km) |
| Piqua to Teteven | 5,171.63 mi (8,322.93 km) |
| Piqua to Troyan | 5,190.23 mi (8,352.86 km) |
| Piqua to Tryavna | 5,220.55 mi (8,401.66 km) |
| Piqua to Tutrakan | 5,207.09 mi (8,380.00 km) |
| Piqua to Varna | 5,293.91 mi (8,519.72 km) |
