| Altadena to Popovo | 6,627.27 mi (10,665.56 km) |
| Altadena to Provadia | 6,666.22 mi (10,728.25 km) |
| Altadena to Radnevo | 6,683.25 mi (10,755.65 km) |
| Altadena to Radomir | 6,591.44 mi (10,607.90 km) |
| Altadena to Rakitovo | 6,654.88 mi (10,709.99 km) |
| Altadena to Rakovski | 6,659.50 mi (10,717.43 km) |
| Altadena to Razgrad | 6,623.04 mi (10,658.75 km) |
| Altadena to Razlog | 6,644.54 mi (10,693.35 km) |
| Altadena to Ruse | 6,591.90 mi (10,608.64 km) |
| Altadena to Samokov | 6,620.03 mi (10,653.91 km) |
| Altadena to Sandanski | 6,658.24 mi (10,715.41 km) |
| Altadena to Sevlievo | 6,619.09 mi (10,652.40 km) |
| Altadena to Shumen | 6,648.22 mi (10,699.27 km) |
| Altadena to Silistra | 6,605.24 mi (10,630.11 km) |
| Altadena to Sliven | 6,670.02 mi (10,734.36 km) |
