| Portalegre to Smolyan | 1,686.11 mi (2,713.53 km) |
| Portalegre to Sofia | 1,610.97 mi (2,592.61 km) |
| Portalegre to Sopot | 1,683.19 mi (2,708.83 km) |
| Portalegre to Sozopol | 1,834.15 mi (2,951.78 km) |
| Portalegre to Sredets | 1,809.16 mi (2,911.55 km) |
| Portalegre to Stamboliyski | 1,674.40 mi (2,694.69 km) |
| Portalegre to Stara Zagora | 1,729.85 mi (2,783.93 km) |
| Portalegre to Svilengrad | 1,761.91 mi (2,835.53 km) |
| Portalegre to Svishtov | 1,710.83 mi (2,753.31 km) |
| Portalegre to Targovishte | 1,773.61 mi (2,854.35 km) |
| Portalegre to Teteven | 1,657.85 mi (2,668.06 km) |
| Portalegre to Troyan | 1,680.71 mi (2,704.83 km) |
| Portalegre to Tryavna | 1,720.37 mi (2,768.68 km) |
| Portalegre to Tutrakan | 1,773.26 mi (2,853.78 km) |
| Portalegre to Varna | 1,840.75 mi (2,962.40 km) |
