| Guyancourt to Smolyan | 1,202.77 mi (1,935.67 km) |
| Guyancourt to Sofia | 1,102.93 mi (1,775.00 km) |
| Guyancourt to Sopot | 1,167.50 mi (1,878.90 km) |
| Guyancourt to Sozopol | 1,306.96 mi (2,103.35 km) |
| Guyancourt to Sredets | 1,286.77 mi (2,070.85 km) |
| Guyancourt to Stamboliyski | 1,175.67 mi (1,892.06 km) |
| Guyancourt to Stara Zagora | 1,214.80 mi (1,955.04 km) |
| Guyancourt to Svilengrad | 1,262.25 mi (2,031.40 km) |
| Guyancourt to Svishtov | 1,163.47 mi (1,872.43 km) |
| Guyancourt to Targovishte | 1,230.17 mi (1,979.78 km) |
| Guyancourt to Teteven | 1,137.14 mi (1,830.06 km) |
| Guyancourt to Troyan | 1,158.27 mi (1,864.05 km) |
| Guyancourt to Tryavna | 1,193.75 mi (1,921.15 km) |
| Guyancourt to Tutrakan | 1,207.92 mi (1,943.96 km) |
| Guyancourt to Varna | 1,291.30 mi (2,078.15 km) |
