| Ludlow to Smolyan | 1,478.82 mi (2,379.94 km) |
| Ludlow to Sofia | 1,375.77 mi (2,214.08 km) |
| Ludlow to Sopot | 1,434.93 mi (2,309.30 km) |
| Ludlow to Sozopol | 1,564.62 mi (2,518.00 km) |
| Ludlow to Sredets | 1,546.93 mi (2,489.54 km) |
| Ludlow to Stamboliyski | 1,448.20 mi (2,330.65 km) |
| Ludlow to Stara Zagora | 1,480.42 mi (2,382.50 km) |
| Ludlow to Svilengrad | 1,530.98 mi (2,463.87 km) |
| Ludlow to Svishtov | 1,419.84 mi (2,285.01 km) |
| Ludlow to Targovishte | 1,485.00 mi (2,389.88 km) |
| Ludlow to Teteven | 1,404.27 mi (2,259.95 km) |
| Ludlow to Troyan | 1,423.84 mi (2,291.45 km) |
| Ludlow to Tryavna | 1,456.29 mi (2,343.68 km) |
| Ludlow to Tutrakan | 1,455.07 mi (2,341.71 km) |
| Ludlow to Varna | 1,541.22 mi (2,480.35 km) |
