| Gretna to Smolyan | 5,982.74 mi (9,628.30 km) |
| Gretna to Sofia | 5,880.10 mi (9,463.11 km) |
| Gretna to Sopot | 5,939.45 mi (9,558.63 km) |
| Gretna to Sozopol | 6,066.48 mi (9,763.05 km) |
| Gretna to Sredets | 6,049.78 mi (9,736.19 km) |
| Gretna to Stamboliyski | 5,952.64 mi (9,579.85 km) |
| Gretna to Stara Zagora | 5,984.71 mi (9,631.46 km) |
| Gretna to Svilengrad | 6,035.52 mi (9,713.23 km) |
| Gretna to Svishtov | 5,922.06 mi (9,530.63 km) |
| Gretna to Targovishte | 5,986.20 mi (9,633.86 km) |
| Gretna to Teteven | 5,908.79 mi (9,509.29 km) |
| Gretna to Troyan | 5,928.22 mi (9,540.55 km) |
| Gretna to Tryavna | 5,960.11 mi (9,591.87 km) |
| Gretna to Tutrakan | 5,952.65 mi (9,579.86 km) |
| Gretna to Varna | 6,039.43 mi (9,719.53 km) |
