| Glassboro to Smolyan | 4,904.23 mi (7,892.59 km) |
| Glassboro to Sofia | 4,802.03 mi (7,728.12 km) |
| Glassboro to Sopot | 4,862.39 mi (7,825.27 km) |
| Glassboro to Sozopol | 4,991.75 mi (8,033.44 km) |
| Glassboro to Sredets | 4,974.44 mi (8,005.59 km) |
| Glassboro to Stamboliyski | 4,874.70 mi (7,845.07 km) |
| Glassboro to Stara Zagora | 4,908.08 mi (7,898.80 km) |
| Glassboro to Svilengrad | 4,958.38 mi (7,979.74 km) |
| Glassboro to Svishtov | 4,847.07 mi (7,800.61 km) |
| Glassboro to Targovishte | 4,911.79 mi (7,904.76 km) |
| Glassboro to Teteven | 4,831.73 mi (7,775.93 km) |
| Glassboro to Troyan | 4,851.48 mi (7,807.70 km) |
| Glassboro to Tryavna | 4,884.02 mi (7,860.07 km) |
| Glassboro to Tutrakan | 4,879.77 mi (7,853.23 km) |
| Glassboro to Varna | 4,966.39 mi (7,992.63 km) |
