| Boulogne-Billancourt to Smolyan | 1,196.69 mi (1,925.89 km) |
| Boulogne-Billancourt to Sofia | 1,096.69 mi (1,764.95 km) |
| Boulogne-Billancourt to Sopot | 1,161.07 mi (1,868.57 km) |
| Boulogne-Billancourt to Sozopol | 1,300.26 mi (2,092.56 km) |
| Boulogne-Billancourt to Sredets | 1,280.14 mi (2,060.18 km) |
| Boulogne-Billancourt to Stamboliyski | 1,169.44 mi (1,882.04 km) |
| Boulogne-Billancourt to Stara Zagora | 1,208.33 mi (1,944.62 km) |
| Boulogne-Billancourt to Svilengrad | 1,255.91 mi (2,021.19 km) |
| Boulogne-Billancourt to Svishtov | 1,156.68 mi (1,861.50 km) |
| Boulogne-Billancourt to Targovishte | 1,223.36 mi (1,968.81 km) |
| Boulogne-Billancourt to Teteven | 1,130.70 mi (1,819.68 km) |
| Boulogne-Billancourt to Troyan | 1,151.78 mi (1,853.60 km) |
| Boulogne-Billancourt to Tryavna | 1,187.16 mi (1,910.55 km) |
| Boulogne-Billancourt to Tutrakan | 1,200.87 mi (1,932.62 km) |
| Boulogne-Billancourt to Varna | 1,284.36 mi (2,066.98 km) |
