| Quincy to Smolyan | 4,627.71 mi (7,447.57 km) |
| Quincy to Sofia | 4,525.46 mi (7,283.02 km) |
| Quincy to Sopot | 4,585.74 mi (7,380.04 km) |
| Quincy to Sozopol | 4,715.04 mi (7,588.12 km) |
| Quincy to Sredets | 4,697.74 mi (7,560.28 km) |
| Quincy to Stamboliyski | 4,598.11 mi (7,399.95 km) |
| Quincy to Stara Zagora | 4,631.41 mi (7,453.54 km) |
| Quincy to Svilengrad | 4,681.74 mi (7,534.53 km) |
| Quincy to Svishtov | 4,570.36 mi (7,355.29 km) |
| Quincy to Targovishte | 4,635.08 mi (7,459.44 km) |
| Quincy to Teteven | 4,555.08 mi (7,330.70 km) |
| Quincy to Troyan | 4,574.81 mi (7,362.44 km) |
| Quincy to Tryavna | 4,607.33 mi (7,414.78 km) |
| Quincy to Tutrakan | 4,603.10 mi (7,407.97 km) |
| Quincy to Varna | 4,689.71 mi (7,547.36 km) |
