| Grez-Doiceau to Sofia | 1,038.11 mi (1,670.68 km) |
| Grez-Doiceau to Sopot | 1,097.00 mi (1,765.45 km) |
| Grez-Doiceau to Sozopol | 1,227.15 mi (1,974.91 km) |
| Grez-Doiceau to Sredets | 1,209.24 mi (1,946.09 km) |
| Grez-Doiceau to Stamboliyski | 1,110.46 mi (1,787.12 km) |
| Grez-Doiceau to Stara Zagora | 1,142.48 mi (1,838.65 km) |
| Grez-Doiceau to Svilengrad | 1,193.05 mi (1,920.02 km) |
| Grez-Doiceau to Svishtov | 1,082.36 mi (1,741.88 km) |
| Grez-Doiceau to Targovishte | 1,147.75 mi (1,847.12 km) |
| Grez-Doiceau to Teteven | 1,066.34 mi (1,716.10 km) |
| Grez-Doiceau to Troyan | 1,085.91 mi (1,747.60 km) |
| Grez-Doiceau to Tryavna | 1,118.43 mi (1,799.94 km) |
| Grez-Doiceau to Tutrakan | 1,118.84 mi (1,800.59 km) |
| Grez-Doiceau to Varna | 1,204.68 mi (1,938.75 km) |
| Grez-Doiceau to Veliki Preslav | 1,160.71 mi (1,867.98 km) |
