| Porto to Smolyan | 1,717.14 mi (2,763.47 km) |
| Porto to Sofia | 1,636.03 mi (2,632.93 km) |
| Porto to Sopot | 1,707.98 mi (2,748.73 km) |
| Porto to Sozopol | 1,858.86 mi (2,991.54 km) |
| Porto to Sredets | 1,834.49 mi (2,952.32 km) |
| Porto to Stamboliyski | 1,702.32 mi (2,739.62 km) |
| Porto to Stara Zagora | 1,755.50 mi (2,825.20 km) |
| Porto to Svilengrad | 1,791.02 mi (2,882.36 km) |
| Porto to Svishtov | 1,729.75 mi (2,783.76 km) |
| Porto to Targovishte | 1,794.23 mi (2,887.53 km) |
| Porto to Teteven | 1,681.26 mi (2,705.72 km) |
| Porto to Troyan | 1,704.14 mi (2,742.55 km) |
| Porto to Tryavna | 1,743.60 mi (2,806.05 km) |
| Porto to Tutrakan | 1,789.35 mi (2,879.67 km) |
| Porto to Varna | 1,861.02 mi (2,995.02 km) |
