| Gladstone to Smolyan | 5,676.95 mi (9,136.17 km) |
| Gladstone to Sofia | 5,572.67 mi (8,968.35 km) |
| Gladstone to Sopot | 5,624.85 mi (9,052.33 km) |
| Gladstone to Sozopol | 5,737.69 mi (9,233.91 km) |
| Gladstone to Sredets | 5,724.25 mi (9,212.29 km) |
| Gladstone to Stamboliyski | 5,643.34 mi (9,082.08 km) |
| Gladstone to Stara Zagora | 5,666.98 mi (9,120.12 km) |
| Gladstone to Svilengrad | 5,720.01 mi (9,205.47 km) |
| Gladstone to Svishtov | 5,596.60 mi (9,006.86 km) |
| Gladstone to Targovishte | 5,657.06 mi (9,104.16 km) |
| Gladstone to Teteven | 5,594.64 mi (9,003.70 km) |
| Gladstone to Troyan | 5,611.93 mi (9,031.53 km) |
| Gladstone to Tryavna | 5,639.77 mi (9,076.33 km) |
| Gladstone to Tutrakan | 5,617.16 mi (9,039.94 km) |
| Gladstone to Varna | 5,703.39 mi (9,178.71 km) |
