| West Covina to Smolyan | 6,697.41 mi (10,778.44 km) |
| West Covina to Sofia | 6,595.15 mi (10,613.87 km) |
| West Covina to Sopot | 6,635.14 mi (10,678.22 km) |
| West Covina to Sozopol | 6,722.59 mi (10,818.96 km) |
| West Covina to Sredets | 6,714.53 mi (10,805.99 km) |
| West Covina to Stamboliyski | 6,660.31 mi (10,718.73 km) |
| West Covina to Stara Zagora | 6,671.02 mi (10,735.97 km) |
| West Covina to Svilengrad | 6,724.99 mi (10,822.83 km) |
| West Covina to Svishtov | 6,592.53 mi (10,609.64 km) |
| West Covina to Targovishte | 6,644.98 mi (10,694.05 km) |
| West Covina to Teteven | 6,606.81 mi (10,632.64 km) |
| West Covina to Troyan | 6,620.37 mi (10,654.46 km) |
| West Covina to Tryavna | 6,641.23 mi (10,688.02 km) |
| West Covina to Tutrakan | 6,597.40 mi (10,617.49 km) |
| West Covina to Varna | 6,678.97 mi (10,748.76 km) |
