| Altus to Smolyan | 6,086.52 mi (9,795.31 km) |
| Altus to Sofia | 5,982.24 mi (9,627.49 km) |
| Altus to Sopot | 6,034.38 mi (9,711.40 km) |
| Altus to Sozopol | 6,146.94 mi (9,892.54 km) |
| Altus to Sredets | 6,133.58 mi (9,871.05 km) |
| Altus to Stamboliyski | 6,052.91 mi (9,741.21 km) |
| Altus to Stara Zagora | 6,076.47 mi (9,779.13 km) |
| Altus to Svilengrad | 6,129.52 mi (9,864.51 km) |
| Altus to Svishtov | 6,005.98 mi (9,665.68 km) |
| Altus to Targovishte | 6,066.33 mi (9,762.82 km) |
| Altus to Teteven | 6,004.18 mi (9,662.79 km) |
| Altus to Troyan | 6,021.45 mi (9,690.58 km) |
| Altus to Tryavna | 6,049.22 mi (9,735.28 km) |
| Altus to Tutrakan | 6,026.26 mi (9,698.32 km) |
| Altus to Varna | 6,112.43 mi (9,837.01 km) |
