| Oklahoma City to Smolyan | 5,979.29 mi (9,622.74 km) |
| Oklahoma City to Sofia | 5,875.04 mi (9,454.97 km) |
| Oklahoma City to Sopot | 5,927.74 mi (9,539.78 km) |
| Oklahoma City to Sozopol | 6,041.48 mi (9,722.82 km) |
| Oklahoma City to Sredets | 6,027.86 mi (9,700.90 km) |
| Oklahoma City to Stamboliyski | 5,945.90 mi (9,569.00 km) |
| Oklahoma City to Stara Zagora | 5,970.10 mi (9,607.94 km) |
| Oklahoma City to Svilengrad | 6,023.03 mi (9,693.13 km) |
| Oklahoma City to Svishtov | 5,900.13 mi (9,495.34 km) |
| Oklahoma City to Targovishte | 5,960.82 mi (9,593.02 km) |
| Oklahoma City to Teteven | 5,897.48 mi (9,491.07 km) |
| Oklahoma City to Troyan | 5,914.92 mi (9,519.15 km) |
| Oklahoma City to Tryavna | 5,943.02 mi (9,564.37 km) |
| Oklahoma City to Tutrakan | 5,921.22 mi (9,529.28 km) |
| Oklahoma City to Varna | 6,007.52 mi (9,668.17 km) |
