| Portimao to Smolyan | 1,790.63 mi (2,881.74 km) |
| Portimao to Sofia | 1,721.04 mi (2,769.75 km) |
| Portimao to Sopot | 1,793.06 mi (2,885.64 km) |
| Portimao to Sozopol | 1,943.31 mi (3,127.46 km) |
| Portimao to Sredets | 1,917.91 mi (3,086.58 km) |
| Portimao to Stamboliyski | 1,781.67 mi (2,867.33 km) |
| Portimao to Stara Zagora | 1,838.75 mi (2,959.19 km) |
| Portimao to Svilengrad | 1,867.69 mi (3,005.75 km) |
| Portimao to Svishtov | 1,825.33 mi (2,937.58 km) |
| Portimao to Targovishte | 1,886.43 mi (3,035.92 km) |
| Portimao to Teteven | 1,769.01 mi (2,846.95 km) |
| Portimao to Troyan | 1,791.71 mi (2,883.48 km) |
| Portimao to Tryavna | 1,831.34 mi (2,947.26 km) |
| Portimao to Tutrakan | 1,889.69 mi (3,041.16 km) |
| Portimao to Varna | 1,953.54 mi (3,143.92 km) |
