| Piqua to Popovo | 5,225.54 mi (8,409.70 km) |
| Piqua to Provadia | 5,277.73 mi (8,493.68 km) |
| Piqua to Radnevo | 5,263.18 mi (8,470.28 km) |
| Piqua to Radomir | 5,137.83 mi (8,268.53 km) |
| Piqua to Rakitovo | 5,207.24 mi (8,380.24 km) |
| Piqua to Rakovski | 5,227.02 mi (8,412.08 km) |
| Piqua to Razgrad | 5,227.50 mi (8,412.85 km) |
| Piqua to Razlog | 5,187.97 mi (8,349.23 km) |
| Piqua to Ruse | 5,193.22 mi (8,357.69 km) |
| Piqua to Samokov | 5,170.79 mi (8,321.59 km) |
| Piqua to Sandanski | 5,195.12 mi (8,360.73 km) |
| Piqua to Sevlievo | 5,198.67 mi (8,366.44 km) |
| Piqua to Shumen | 5,254.59 mi (8,456.44 km) |
| Piqua to Silistra | 5,227.47 mi (8,412.80 km) |
| Piqua to Sliven | 5,260.35 mi (8,465.72 km) |
