| Viana do Castelo to Smolyan | 1,720.39 mi (2,768.70 km) |
| Viana do Castelo to Sofia | 1,637.75 mi (2,635.70 km) |
| Viana do Castelo to Sopot | 1,709.53 mi (2,751.23 km) |
| Viana do Castelo to Sozopol | 1,860.21 mi (2,993.72 km) |
| Viana do Castelo to Sredets | 1,836.04 mi (2,954.81 km) |
| Viana do Castelo to Stamboliyski | 1,704.74 mi (2,743.51 km) |
| Viana do Castelo to Stara Zagora | 1,757.22 mi (2,827.98 km) |
| Viana do Castelo to Svilengrad | 1,793.65 mi (2,886.60 km) |
| Viana do Castelo to Svishtov | 1,729.67 mi (2,783.63 km) |
| Viana do Castelo to Targovishte | 1,794.53 mi (2,888.02 km) |
| Viana do Castelo to Teteven | 1,682.46 mi (2,707.66 km) |
| Viana do Castelo to Troyan | 1,705.32 mi (2,744.46 km) |
| Viana do Castelo to Tryavna | 1,744.68 mi (2,807.78 km) |
| Viana do Castelo to Tutrakan | 1,788.42 mi (2,878.18 km) |
| Viana do Castelo to Varna | 1,861.15 mi (2,995.24 km) |
