| Alfaro to Smolyan | 1,355.77 mi (2,181.90 km) |
| Alfaro to Sofia | 1,274.60 mi (2,051.27 km) |
| Alfaro to Sopot | 1,346.59 mi (2,167.12 km) |
| Alfaro to Sozopol | 1,497.50 mi (2,410.00 km) |
| Alfaro to Sredets | 1,473.08 mi (2,370.70 km) |
| Alfaro to Stamboliyski | 1,340.83 mi (2,157.86 km) |
| Alfaro to Stara Zagora | 1,394.06 mi (2,243.53 km) |
| Alfaro to Svilengrad | 1,429.54 mi (2,300.62 km) |
| Alfaro to Svishtov | 1,369.14 mi (2,203.42 km) |
| Alfaro to Targovishte | 1,433.35 mi (2,306.75 km) |
| Alfaro to Teteven | 1,319.97 mi (2,124.28 km) |
| Alfaro to Troyan | 1,342.86 mi (2,161.12 km) |
| Alfaro to Tryavna | 1,382.35 mi (2,224.67 km) |
| Alfaro to Tutrakan | 1,429.43 mi (2,300.45 km) |
| Alfaro to Varna | 1,500.23 mi (2,414.39 km) |
