| Fountain Valley to Popovo | 6,652.91 mi (10,706.82 km) |
| Fountain Valley to Provadia | 6,692.15 mi (10,769.97 km) |
| Fountain Valley to Radnevo | 6,708.60 mi (10,796.44 km) |
| Fountain Valley to Radomir | 6,616.03 mi (10,647.47 km) |
| Fountain Valley to Rakitovo | 6,679.65 mi (10,749.86 km) |
| Fountain Valley to Rakovski | 6,684.58 mi (10,757.79 km) |
| Fountain Valley to Razgrad | 6,648.79 mi (10,700.20 km) |
| Fountain Valley to Razlog | 6,669.12 mi (10,732.91 km) |
| Fountain Valley to Ruse | 6,617.57 mi (10,649.95 km) |
| Fountain Valley to Samokov | 6,644.73 mi (10,693.67 km) |
| Fountain Valley to Sandanski | 6,682.70 mi (10,754.77 km) |
| Fountain Valley to Sevlievo | 6,644.37 mi (10,693.08 km) |
| Fountain Valley to Shumen | 6,674.03 mi (10,740.81 km) |
| Fountain Valley to Silistra | 6,631.31 mi (10,672.06 km) |
| Fountain Valley to Sliven | 6,695.55 mi (10,775.45 km) |
