| California to Smolyan | 5,023.17 mi (8,084.01 km) |
| California to Sofia | 4,921.13 mi (7,919.80 km) |
| California to Sopot | 4,981.78 mi (8,017.40 km) |
| California to Sozopol | 5,111.64 mi (8,226.39 km) |
| California to Sredets | 5,094.22 mi (8,198.35 km) |
| California to Stamboliyski | 4,993.83 mi (8,036.79 km) |
| California to Stara Zagora | 5,027.57 mi (8,091.09 km) |
| California to Svilengrad | 5,077.73 mi (8,171.82 km) |
| California to Svishtov | 4,966.93 mi (7,993.50 km) |
| California to Targovishte | 5,031.75 mi (8,097.82 km) |
| California to Teteven | 4,951.12 mi (7,968.06 km) |
| California to Troyan | 4,970.94 mi (7,999.96 km) |
| California to Tryavna | 5,003.64 mi (8,052.57 km) |
| California to Tutrakan | 5,000.00 mi (8,046.73 km) |
| California to Varna | 5,086.59 mi (8,186.07 km) |
