| Estoril to Smolyan | 1,800.14 mi (2,897.04 km) |
| Estoril to Sofia | 1,725.34 mi (2,776.67 km) |
| Estoril to Sopot | 1,797.56 mi (2,892.89 km) |
| Estoril to Sozopol | 1,948.50 mi (3,135.81 km) |
| Estoril to Sredets | 1,923.48 mi (3,095.55 km) |
| Estoril to Stamboliyski | 1,788.63 mi (2,878.52 km) |
| Estoril to Stara Zagora | 1,844.18 mi (2,967.92 km) |
| Estoril to Svilengrad | 1,876.05 mi (3,019.22 km) |
| Estoril to Svishtov | 1,825.32 mi (2,937.56 km) |
| Estoril to Targovishte | 1,888.08 mi (3,038.57 km) |
| Estoril to Teteven | 1,772.27 mi (2,852.19 km) |
| Estoril to Troyan | 1,795.12 mi (2,888.97 km) |
| Estoril to Tryavna | 1,834.79 mi (2,952.81 km) |
| Estoril to Tutrakan | 1,887.74 mi (3,038.03 km) |
| Estoril to Varna | 1,955.22 mi (3,146.62 km) |
