| Ponca City to Smolyan | 5,896.50 mi (9,489.49 km) |
| Ponca City to Sofia | 5,792.22 mi (9,321.68 km) |
| Ponca City to Sopot | 5,844.48 mi (9,405.78 km) |
| Ponca City to Sozopol | 5,957.36 mi (9,587.44 km) |
| Ponca City to Sredets | 5,943.92 mi (9,565.82 km) |
| Ponca City to Stamboliyski | 5,862.92 mi (9,435.46 km) |
| Ponca City to Stara Zagora | 5,886.63 mi (9,473.61 km) |
| Ponca City to Svilengrad | 5,939.65 mi (9,558.94 km) |
| Ponca City to Svishtov | 5,816.27 mi (9,360.39 km) |
| Ponca City to Targovishte | 5,876.73 mi (9,457.69 km) |
| Ponca City to Teteven | 5,814.26 mi (9,357.14 km) |
| Ponca City to Troyan | 5,831.57 mi (9,385.00 km) |
| Ponca City to Tryavna | 5,859.43 mi (9,429.83 km) |
| Ponca City to Tutrakan | 5,836.81 mi (9,393.44 km) |
| Ponca City to Varna | 5,923.03 mi (9,532.20 km) |
