| Eustis to Smolyan | 5,679.93 mi (9,140.97 km) |
| Eustis to Sofia | 5,579.77 mi (8,979.78 km) |
| Eustis to Sopot | 5,643.11 mi (9,081.71 km) |
| Eustis to Sozopol | 5,778.06 mi (9,298.88 km) |
| Eustis to Sredets | 5,759.35 mi (9,268.78 km) |
| Eustis to Stamboliyski | 5,652.56 mi (9,096.92 km) |
| Eustis to Stara Zagora | 5,689.86 mi (9,156.95 km) |
| Eustis to Svilengrad | 5,738.47 mi (9,235.17 km) |
| Eustis to Svishtov | 5,633.35 mi (9,066.00 km) |
| Eustis to Targovishte | 5,699.13 mi (9,171.87 km) |
| Eustis to Teteven | 5,612.58 mi (9,032.57 km) |
| Eustis to Troyan | 5,633.17 mi (9,065.71 km) |
| Eustis to Tryavna | 5,667.37 mi (9,120.75 km) |
| Eustis to Tutrakan | 5,670.48 mi (9,125.76 km) |
| Eustis to Varna | 5,756.44 mi (9,264.09 km) |
