| Valley Center to Popovo | 6,659.30 mi (10,717.11 km) |
| Valley Center to Provadia | 6,699.29 mi (10,781.47 km) |
| Valley Center to Radnevo | 6,714.20 mi (10,805.46 km) |
| Valley Center to Radomir | 6,619.69 mi (10,653.36 km) |
| Valley Center to Rakitovo | 6,683.77 mi (10,756.48 km) |
| Valley Center to Rakovski | 6,689.49 mi (10,765.70 km) |
| Valley Center to Razgrad | 6,655.48 mi (10,710.97 km) |
| Valley Center to Razlog | 6,672.74 mi (10,738.74 km) |
| Valley Center to Ruse | 6,624.03 mi (10,660.34 km) |
| Valley Center to Samokov | 6,648.69 mi (10,700.03 km) |
| Valley Center to Sandanski | 6,686.01 mi (10,760.09 km) |
| Valley Center to Sevlievo | 6,649.80 mi (10,701.82 km) |
| Valley Center to Shumen | 6,680.88 mi (10,751.83 km) |
| Valley Center to Silistra | 6,638.83 mi (10,684.16 km) |
| Valley Center to Sliven | 6,701.65 mi (10,785.26 km) |
