| Oklahoma City to Popovo | 5,943.82 mi (9,565.66 km) |
| Oklahoma City to Provadia | 5,993.01 mi (9,644.82 km) |
| Oklahoma City to Radnevo | 5,986.69 mi (9,634.65 km) |
| Oklahoma City to Radomir | 5,868.82 mi (9,444.96 km) |
| Oklahoma City to Rakitovo | 5,937.35 mi (9,555.24 km) |
| Oklahoma City to Rakovski | 5,953.41 mi (9,581.09 km) |
| Oklahoma City to Razgrad | 5,944.14 mi (9,566.17 km) |
| Oklahoma City to Razlog | 5,920.18 mi (9,527.61 km) |
| Oklahoma City to Ruse | 5,910.35 mi (9,511.79 km) |
| Oklahoma City to Samokov | 5,900.97 mi (9,496.70 km) |
| Oklahoma City to Sandanski | 5,929.05 mi (9,541.88 km) |
| Oklahoma City to Sevlievo | 5,921.63 mi (9,529.94 km) |
| Oklahoma City to Shumen | 5,971.00 mi (9,609.40 km) |
| Oklahoma City to Silistra | 5,939.31 mi (9,558.39 km) |
| Oklahoma City to Sliven | 5,981.10 mi (9,625.65 km) |
