| Seal Beach to Popovo | 6,653.13 mi (10,707.18 km) |
| Seal Beach to Provadia | 6,692.28 mi (10,770.18 km) |
| Seal Beach to Radnevo | 6,708.91 mi (10,796.94 km) |
| Seal Beach to Radomir | 6,616.57 mi (10,648.35 km) |
| Seal Beach to Rakitovo | 6,680.14 mi (10,750.64 km) |
| Seal Beach to Rakovski | 6,684.97 mi (10,758.43 km) |
| Seal Beach to Razgrad | 6,648.98 mi (10,700.49 km) |
| Seal Beach to Razlog | 6,669.66 mi (10,733.79 km) |
| Seal Beach to Ruse | 6,617.78 mi (10,650.29 km) |
| Seal Beach to Samokov | 6,645.24 mi (10,694.49 km) |
| Seal Beach to Sandanski | 6,683.28 mi (10,755.71 km) |
| Seal Beach to Sevlievo | 6,644.70 mi (10,693.61 km) |
| Seal Beach to Shumen | 6,674.19 mi (10,741.08 km) |
| Seal Beach to Silistra | 6,631.39 mi (10,672.19 km) |
| Seal Beach to Sliven | 6,695.81 mi (10,775.86 km) |
