| Longford to Smolyan | 1,708.40 mi (2,749.40 km) |
| Longford to Sofia | 1,605.07 mi (2,583.12 km) |
| Longford to Sopot | 1,663.36 mi (2,676.92 km) |
| Longford to Sozopol | 1,791.04 mi (2,882.40 km) |
| Longford to Sredets | 1,773.87 mi (2,854.77 km) |
| Longford to Stamboliyski | 1,677.35 mi (2,699.44 km) |
| Longford to Stara Zagora | 1,708.47 mi (2,749.51 km) |
| Longford to Svilengrad | 1,759.44 mi (2,831.54 km) |
| Longford to Svishtov | 1,646.39 mi (2,649.61 km) |
| Longford to Targovishte | 1,711.07 mi (2,753.70 km) |
| Longford to Teteven | 1,632.71 mi (2,627.60 km) |
| Longford to Troyan | 1,652.00 mi (2,658.64 km) |
| Longford to Tryavna | 1,683.88 mi (2,709.94 km) |
| Longford to Tutrakan | 1,679.62 mi (2,703.09 km) |
| Longford to Varna | 1,766.09 mi (2,842.25 km) |
