| Castro Daire to Smolyan | 1,685.92 mi (2,713.23 km) |
| Castro Daire to Sofia | 1,605.88 mi (2,584.41 km) |
| Castro Daire to Sopot | 1,677.93 mi (2,700.36 km) |
| Castro Daire to Sozopol | 1,828.90 mi (2,943.33 km) |
| Castro Daire to Sredets | 1,804.39 mi (2,903.89 km) |
| Castro Daire to Stamboliyski | 1,671.67 mi (2,690.30 km) |
| Castro Daire to Stara Zagora | 1,725.31 mi (2,776.61 km) |
| Castro Daire to Svilengrad | 1,760.19 mi (2,832.76 km) |
| Castro Daire to Svishtov | 1,700.85 mi (2,737.25 km) |
| Castro Daire to Targovishte | 1,765.03 mi (2,840.54 km) |
| Castro Daire to Teteven | 1,651.45 mi (2,657.75 km) |
| Castro Daire to Troyan | 1,674.34 mi (2,694.59 km) |
| Castro Daire to Tryavna | 1,713.86 mi (2,758.20 km) |
| Castro Daire to Tutrakan | 1,761.05 mi (2,834.13 km) |
| Castro Daire to Varna | 1,831.92 mi (2,948.20 km) |
