| Cayce to Popovo | 5,404.40 mi (8,697.54 km) |
| Cayce to Provadia | 5,459.85 mi (8,786.78 km) |
| Cayce to Radnevo | 5,434.72 mi (8,746.34 km) |
| Cayce to Radomir | 5,300.30 mi (8,530.00 km) |
| Cayce to Rakitovo | 5,370.23 mi (8,642.55 km) |
| Cayce to Rakovski | 5,395.02 mi (8,682.45 km) |
| Cayce to Razgrad | 5,408.44 mi (8,704.04 km) |
| Cayce to Razlog | 5,348.14 mi (8,607.00 km) |
| Cayce to Ruse | 5,373.92 mi (8,648.49 km) |
| Cayce to Samokov | 5,334.08 mi (8,584.37 km) |
| Cayce to Sandanski | 5,352.68 mi (8,614.31 km) |
| Cayce to Sevlievo | 5,371.64 mi (8,644.82 km) |
| Cayce to Shumen | 5,435.52 mi (8,747.62 km) |
| Cayce to Silistra | 5,414.44 mi (8,713.71 km) |
| Cayce to Sliven | 5,435.60 mi (8,747.76 km) |
