| West Covina to Popovo | 6,630.38 mi (10,670.57 km) |
| West Covina to Provadia | 6,669.53 mi (10,733.56 km) |
| West Covina to Radnevo | 6,686.17 mi (10,760.35 km) |
| West Covina to Radomir | 6,593.88 mi (10,611.82 km) |
| West Covina to Rakitovo | 6,657.43 mi (10,714.10 km) |
| West Covina to Rakovski | 6,662.25 mi (10,721.85 km) |
| West Covina to Razgrad | 6,626.23 mi (10,663.89 km) |
| West Covina to Razlog | 6,646.97 mi (10,697.26 km) |
| West Covina to Ruse | 6,595.03 mi (10,613.68 km) |
| West Covina to Samokov | 6,622.54 mi (10,657.95 km) |
| West Covina to Sandanski | 6,660.60 mi (10,719.19 km) |
| West Covina to Sevlievo | 6,621.97 mi (10,657.03 km) |
| West Covina to Shumen | 6,651.45 mi (10,704.47 km) |
| West Covina to Silistra | 6,608.64 mi (10,635.57 km) |
| West Covina to Sliven | 6,673.06 mi (10,739.26 km) |
