| Ponca City to Popovo | 5,859.80 mi (9,430.44 km) |
| Ponca City to Provadia | 5,908.68 mi (9,509.10 km) |
| Ponca City to Radnevo | 5,903.19 mi (9,500.26 km) |
| Ponca City to Radomir | 5,786.19 mi (9,311.98 km) |
| Ponca City to Rakitovo | 5,854.59 mi (9,422.05 km) |
| Ponca City to Rakovski | 5,870.23 mi (9,447.22 km) |
| Ponca City to Razgrad | 5,859.96 mi (9,430.70 km) |
| Ponca City to Razlog | 5,837.67 mi (9,394.83 km) |
| Ponca City to Ruse | 5,826.23 mi (9,376.41 km) |
| Ponca City to Samokov | 5,818.24 mi (9,363.55 km) |
| Ponca City to Sandanski | 5,846.75 mi (9,409.44 km) |
| Ponca City to Sevlievo | 5,838.09 mi (9,395.49 km) |
| Ponca City to Shumen | 5,886.79 mi (9,473.87 km) |
| Ponca City to Silistra | 5,854.68 mi (9,422.20 km) |
| Ponca City to Sliven | 5,897.31 mi (9,490.80 km) |
