| Guadarrama to Smolyan | 1,492.65 mi (2,402.19 km) |
| Guadarrama to Sofia | 1,415.43 mi (2,277.92 km) |
| Guadarrama to Sopot | 1,487.63 mi (2,394.11 km) |
| Guadarrama to Sozopol | 1,638.67 mi (2,637.19 km) |
| Guadarrama to Sredets | 1,613.85 mi (2,597.24 km) |
| Guadarrama to Stamboliyski | 1,479.83 mi (2,381.56 km) |
| Guadarrama to Stara Zagora | 1,534.59 mi (2,469.68 km) |
| Guadarrama to Svilengrad | 1,567.82 mi (2,523.16 km) |
| Guadarrama to Svishtov | 1,513.72 mi (2,436.10 km) |
| Guadarrama to Targovishte | 1,576.96 mi (2,537.86 km) |
| Guadarrama to Teteven | 1,461.87 mi (2,352.65 km) |
| Guadarrama to Troyan | 1,484.75 mi (2,389.47 km) |
| Guadarrama to Tryavna | 1,524.38 mi (2,453.26 km) |
| Guadarrama to Tutrakan | 1,575.57 mi (2,535.64 km) |
| Guadarrama to Varna | 1,644.05 mi (2,645.84 km) |
