| Diamond Bar to Smolyan | 6,698.37 mi (10,779.98 km) |
| Diamond Bar to Sofia | 6,596.08 mi (10,615.36 km) |
| Diamond Bar to Sopot | 6,636.16 mi (10,679.87 km) |
| Diamond Bar to Sozopol | 6,723.82 mi (10,820.95 km) |
| Diamond Bar to Sredets | 6,715.72 mi (10,807.91 km) |
| Diamond Bar to Stamboliyski | 6,661.29 mi (10,720.31 km) |
| Diamond Bar to Stara Zagora | 6,672.10 mi (10,737.71 km) |
| Diamond Bar to Svilengrad | 6,726.08 mi (10,824.58 km) |
| Diamond Bar to Svishtov | 6,593.65 mi (10,611.46 km) |
| Diamond Bar to Targovishte | 6,646.17 mi (10,695.98 km) |
| Diamond Bar to Teteven | 6,607.82 mi (10,634.26 km) |
| Diamond Bar to Troyan | 6,621.41 mi (10,656.13 km) |
| Diamond Bar to Tryavna | 6,642.32 mi (10,689.79 km) |
| Diamond Bar to Tutrakan | 6,598.64 mi (10,619.49 km) |
| Diamond Bar to Varna | 6,680.26 mi (10,750.84 km) |
