| Calhoun to Popovo | 5,533.05 mi (8,904.59 km) |
| Calhoun to Provadia | 5,587.17 mi (8,991.69 km) |
| Calhoun to Radnevo | 5,566.55 mi (8,958.49 km) |
| Calhoun to Radomir | 5,435.70 mi (8,747.92 km) |
| Calhoun to Rakitovo | 5,505.53 mi (8,860.29 km) |
| Calhoun to Rakovski | 5,528.27 mi (8,896.90 km) |
| Calhoun to Razgrad | 5,536.20 mi (8,909.65 km) |
| Calhoun to Razlog | 5,484.57 mi (8,826.56 km) |
| Calhoun to Ruse | 5,501.73 mi (8,854.18 km) |
| Calhoun to Samokov | 5,469.20 mi (8,801.83 km) |
| Calhoun to Sandanski | 5,490.18 mi (8,835.59 km) |
| Calhoun to Sevlievo | 5,502.76 mi (8,855.83 km) |
| Calhoun to Shumen | 5,563.32 mi (8,953.30 km) |
| Calhoun to Silistra | 5,539.58 mi (8,915.09 km) |
| Calhoun to Sliven | 5,565.85 mi (8,957.37 km) |
