| Illescas to Smolyan | 1,487.90 mi (2,394.55 km) |
| Illescas to Sofia | 1,412.72 mi (2,273.55 km) |
| Illescas to Sopot | 1,484.93 mi (2,389.77 km) |
| Illescas to Sozopol | 1,635.88 mi (2,632.70 km) |
| Illescas to Sredets | 1,610.88 mi (2,592.45 km) |
| Illescas to Stamboliyski | 1,476.11 mi (2,375.57 km) |
| Illescas to Stara Zagora | 1,531.57 mi (2,464.83 km) |
| Illescas to Svilengrad | 1,563.65 mi (2,516.45 km) |
| Illescas to Svishtov | 1,512.92 mi (2,434.81 km) |
| Illescas to Targovishte | 1,575.54 mi (2,535.59 km) |
| Illescas to Teteven | 1,459.65 mi (2,349.08 km) |
| Illescas to Troyan | 1,482.50 mi (2,385.85 km) |
| Illescas to Tryavna | 1,522.17 mi (2,449.69 km) |
| Illescas to Tutrakan | 1,575.63 mi (2,535.73 km) |
| Illescas to Varna | 1,642.69 mi (2,643.66 km) |
