| Simi Valley to Smolyan | 6,706.13 mi (10,792.47 km) |
| Simi Valley to Sofia | 6,604.14 mi (10,628.34 km) |
| Simi Valley to Sopot | 6,643.37 mi (10,691.47 km) |
| Simi Valley to Sozopol | 6,729.26 mi (10,829.70 km) |
| Simi Valley to Sredets | 6,721.52 mi (10,817.24 km) |
| Simi Valley to Stamboliyski | 6,668.89 mi (10,732.54 km) |
| Simi Valley to Stara Zagora | 6,678.85 mi (10,748.57 km) |
| Simi Valley to Svilengrad | 6,732.79 mi (10,835.38 km) |
| Simi Valley to Svishtov | 6,600.01 mi (10,621.69 km) |
| Simi Valley to Targovishte | 6,651.94 mi (10,705.26 km) |
| Simi Valley to Teteven | 6,615.20 mi (10,646.13 km) |
| Simi Valley to Troyan | 6,628.52 mi (10,667.58 km) |
| Simi Valley to Tryavna | 6,648.95 mi (10,700.45 km) |
| Simi Valley to Tutrakan | 6,604.01 mi (10,628.12 km) |
| Simi Valley to Varna | 6,685.19 mi (10,758.78 km) |
