| Sierra Vista to Popovo | 6,577.11 mi (10,584.84 km) |
| Sierra Vista to Provadia | 6,621.62 mi (10,656.48 km) |
| Sierra Vista to Radnevo | 6,626.69 mi (10,664.63 km) |
| Sierra Vista to Radomir | 6,520.55 mi (10,493.81 km) |
| Sierra Vista to Rakitovo | 6,587.11 mi (10,600.93 km) |
| Sierra Vista to Rakovski | 6,597.79 mi (10,618.11 km) |
| Sierra Vista to Razgrad | 6,575.20 mi (10,581.76 km) |
| Sierra Vista to Razlog | 6,573.08 mi (10,578.36 km) |
| Sierra Vista to Ruse | 6,542.47 mi (10,529.08 km) |
| Sierra Vista to Samokov | 6,551.21 mi (10,543.16 km) |
| Sierra Vista to Sandanski | 6,584.31 mi (10,596.42 km) |
| Sierra Vista to Sevlievo | 6,561.60 mi (10,559.88 km) |
| Sierra Vista to Shumen | 6,601.43 mi (10,623.97 km) |
| Sierra Vista to Silistra | 6,563.92 mi (10,563.61 km) |
| Sierra Vista to Sliven | 6,617.34 mi (10,649.58 km) |
