| Calahorra to Popovo | 1,424.08 mi (2,291.83 km) |
| Calahorra to Provadia | 1,485.43 mi (2,390.57 km) |
| Calahorra to Radnevo | 1,419.33 mi (2,284.20 km) |
| Calahorra to Radomir | 1,266.32 mi (2,037.94 km) |
| Calahorra to Rakitovo | 1,329.54 mi (2,139.68 km) |
| Calahorra to Rakovski | 1,370.66 mi (2,205.86 km) |
| Calahorra to Razgrad | 1,436.73 mi (2,312.19 km) |
| Calahorra to Razlog | 1,299.48 mi (2,091.31 km) |
| Calahorra to Ruse | 1,406.68 mi (2,263.83 km) |
| Calahorra to Samokov | 1,298.95 mi (2,090.46 km) |
| Calahorra to Sandanski | 1,294.01 mi (2,082.51 km) |
| Calahorra to Sevlievo | 1,370.82 mi (2,206.13 km) |
| Calahorra to Shumen | 1,459.57 mi (2,348.95 km) |
| Calahorra to Silistra | 1,469.45 mi (2,364.86 km) |
| Calahorra to Sliven | 1,435.29 mi (2,309.87 km) |
