| Louth to Smolyan | 1,400.51 mi (2,253.90 km) |
| Louth to Sofia | 1,296.51 mi (2,086.53 km) |
| Louth to Sopot | 1,352.25 mi (2,176.23 km) |
| Louth to Sozopol | 1,476.10 mi (2,375.56 km) |
| Louth to Sredets | 1,459.73 mi (2,349.21 km) |
| Louth to Stamboliyski | 1,368.14 mi (2,201.81 km) |
| Louth to Stara Zagora | 1,396.42 mi (2,247.32 km) |
| Louth to Svilengrad | 1,448.21 mi (2,330.68 km) |
| Louth to Svishtov | 1,331.84 mi (2,143.39 km) |
| Louth to Targovishte | 1,395.77 mi (2,246.27 km) |
| Louth to Teteven | 1,321.69 mi (2,127.05 km) |
| Louth to Troyan | 1,340.29 mi (2,156.99 km) |
| Louth to Tryavna | 1,370.95 mi (2,206.33 km) |
| Louth to Tutrakan | 1,362.69 mi (2,193.03 km) |
| Louth to Varna | 1,449.37 mi (2,332.54 km) |
