| Portes-les-Valence to Smolyan | 1,020.77 mi (1,642.77 km) |
| Portes-les-Valence to Sofia | 930.54 mi (1,497.56 km) |
| Portes-les-Valence to Sopot | 1,000.94 mi (1,610.86 km) |
| Portes-les-Valence to Sozopol | 1,149.78 mi (1,850.40 km) |
| Portes-les-Valence to Sredets | 1,126.60 mi (1,813.10 km) |
| Portes-les-Valence to Stamboliyski | 1,000.54 mi (1,610.22 km) |
| Portes-les-Valence to Stara Zagora | 1,049.11 mi (1,688.38 km) |
| Portes-les-Valence to Svilengrad | 1,089.82 mi (1,753.90 km) |
| Portes-les-Valence to Svishtov | 1,014.36 mi (1,632.46 km) |
| Portes-les-Valence to Targovishte | 1,080.31 mi (1,738.59 km) |
| Portes-les-Valence to Teteven | 972.47 mi (1,565.04 km) |
| Portes-les-Valence to Troyan | 995.09 mi (1,601.44 km) |
| Portes-les-Valence to Tryavna | 1,033.73 mi (1,663.62 km) |
| Portes-les-Valence to Tutrakan | 1,070.39 mi (1,722.62 km) |
| Portes-les-Valence to Varna | 1,146.09 mi (1,844.46 km) |
