| Castle Pines to Popovo | 5,952.14 mi (9,579.05 km) |
| Castle Pines to Provadia | 5,996.41 mi (9,650.29 km) |
| Castle Pines to Radnevo | 6,002.14 mi (9,659.52 km) |
| Castle Pines to Radomir | 5,897.22 mi (9,490.66 km) |
| Castle Pines to Rakitovo | 5,963.50 mi (9,597.33 km) |
| Castle Pines to Rakovski | 5,973.63 mi (9,613.62 km) |
| Castle Pines to Razgrad | 5,950.11 mi (9,575.78 km) |
| Castle Pines to Razlog | 5,949.86 mi (9,575.37 km) |
| Castle Pines to Ruse | 5,917.45 mi (9,523.21 km) |
| Castle Pines to Samokov | 5,927.69 mi (9,539.70 km) |
| Castle Pines to Sandanski | 5,961.37 mi (9,593.90 km) |
| Castle Pines to Sevlievo | 5,937.09 mi (9,554.82 km) |
| Castle Pines to Shumen | 5,976.30 mi (9,617.93 km) |
| Castle Pines to Silistra | 5,938.58 mi (9,557.22 km) |
| Castle Pines to Sliven | 5,992.53 mi (9,644.04 km) |
