| Billings to Smolyan | 5,748.82 mi (9,251.83 km) |
| Billings to Sofia | 5,646.47 mi (9,087.11 km) |
| Billings to Sopot | 5,686.81 mi (9,152.04 km) |
| Billings to Sozopol | 5,775.69 mi (9,295.07 km) |
| Billings to Sredets | 5,767.27 mi (9,281.52 km) |
| Billings to Stamboliyski | 5,711.79 mi (9,192.24 km) |
| Billings to Stara Zagora | 5,722.98 mi (9,210.25 km) |
| Billings to Svilengrad | 5,776.97 mi (9,297.13 km) |
| Billings to Svishtov | 5,644.78 mi (9,084.40 km) |
| Billings to Targovishte | 5,697.76 mi (9,169.65 km) |
| Billings to Teteven | 5,658.40 mi (9,106.32 km) |
| Billings to Troyan | 5,672.10 mi (9,128.37 km) |
| Billings to Tryavna | 5,693.27 mi (9,162.43 km) |
| Billings to Tutrakan | 5,650.60 mi (9,093.76 km) |
| Billings to Varna | 5,732.65 mi (9,225.82 km) |
