| Bois-Guillaume to Smolyan | 1,257.74 mi (2,024.14 km) |
| Bois-Guillaume to Sofia | 1,157.04 mi (1,862.08 km) |
| Bois-Guillaume to Sopot | 1,220.55 mi (1,964.28 km) |
| Bois-Guillaume to Sozopol | 1,358.15 mi (2,185.72 km) |
| Bois-Guillaume to Sredets | 1,338.46 mi (2,154.04 km) |
| Bois-Guillaume to Stamboliyski | 1,229.84 mi (1,979.24 km) |
| Bois-Guillaume to Stara Zagora | 1,267.54 mi (2,039.91 km) |
| Bois-Guillaume to Svilengrad | 1,315.74 mi (2,117.47 km) |
| Bois-Guillaume to Svishtov | 1,214.11 mi (1,953.92 km) |
| Bois-Guillaume to Targovishte | 1,280.61 mi (2,060.94 km) |
| Bois-Guillaume to Teteven | 1,190.07 mi (1,915.23 km) |
| Bois-Guillaume to Troyan | 1,210.90 mi (1,948.75 km) |
| Bois-Guillaume to Tryavna | 1,245.78 mi (2,004.89 km) |
| Bois-Guillaume to Tutrakan | 1,256.64 mi (2,022.37 km) |
| Bois-Guillaume to Varna | 1,340.80 mi (2,157.81 km) |
