| Porterville to Smolyan | 6,602.17 mi (10,625.16 km) |
| Porterville to Sofia | 6,500.58 mi (10,461.68 km) |
| Porterville to Sopot | 6,538.73 mi (10,523.07 km) |
| Porterville to Sozopol | 6,622.49 mi (10,657.88 km) |
| Porterville to Sredets | 6,615.16 mi (10,646.08 km) |
| Porterville to Stamboliyski | 6,564.73 mi (10,564.91 km) |
| Porterville to Stara Zagora | 6,573.64 mi (10,579.25 km) |
| Porterville to Svilengrad | 6,627.53 mi (10,665.98 km) |
| Porterville to Svishtov | 6,494.36 mi (10,451.67 km) |
| Porterville to Targovishte | 6,545.57 mi (10,534.07 km) |
| Porterville to Teteven | 6,510.78 mi (10,478.08 km) |
| Porterville to Troyan | 6,523.78 mi (10,499.00 km) |
| Porterville to Tryavna | 6,543.61 mi (10,530.93 km) |
| Porterville to Tutrakan | 6,497.18 mi (10,456.21 km) |
| Porterville to Varna | 6,577.85 mi (10,586.03 km) |
