| Greenbelt to Smolyan | 5,008.61 mi (8,060.58 km) |
| Greenbelt to Sofia | 4,906.29 mi (7,895.91 km) |
| Greenbelt to Sopot | 4,966.40 mi (7,992.66 km) |
| Greenbelt to Sozopol | 5,095.23 mi (8,199.99 km) |
| Greenbelt to Sredets | 5,078.06 mi (8,172.35 km) |
| Greenbelt to Stamboliyski | 4,978.93 mi (8,012.81 km) |
| Greenbelt to Stara Zagora | 5,011.99 mi (8,066.02 km) |
| Greenbelt to Svilengrad | 5,062.41 mi (8,147.17 km) |
| Greenbelt to Svishtov | 4,950.60 mi (7,967.22 km) |
| Greenbelt to Targovishte | 5,015.20 mi (8,071.18 km) |
| Greenbelt to Teteven | 4,935.74 mi (7,943.31 km) |
| Greenbelt to Troyan | 4,955.41 mi (7,974.96 km) |
| Greenbelt to Tryavna | 4,987.80 mi (8,027.09 km) |
| Greenbelt to Tutrakan | 4,982.85 mi (8,019.13 km) |
| Greenbelt to Varna | 5,069.52 mi (8,158.60 km) |
