| Cascais to Smolyan | 1,801.17 mi (2,898.70 km) |
| Cascais to Sofia | 1,726.38 mi (2,778.33 km) |
| Cascais to Sopot | 1,798.59 mi (2,894.55 km) |
| Cascais to Sozopol | 1,949.54 mi (3,137.48 km) |
| Cascais to Sredets | 1,924.52 mi (3,097.21 km) |
| Cascais to Stamboliyski | 1,789.66 mi (2,880.18 km) |
| Cascais to Stara Zagora | 1,845.21 mi (2,969.59 km) |
| Cascais to Svilengrad | 1,877.09 mi (3,020.88 km) |
| Cascais to Svishtov | 1,826.34 mi (2,939.22 km) |
| Cascais to Targovishte | 1,889.11 mi (3,040.23 km) |
| Cascais to Teteven | 1,773.30 mi (2,853.85 km) |
| Cascais to Troyan | 1,796.15 mi (2,890.63 km) |
| Cascais to Tryavna | 1,835.82 mi (2,954.47 km) |
| Cascais to Tutrakan | 1,888.77 mi (3,039.68 km) |
| Cascais to Varna | 1,956.25 mi (3,148.28 km) |
