| Dundalk to Smolyan | 4,980.21 mi (8,014.88 km) |
| Dundalk to Sofia | 4,877.89 mi (7,850.20 km) |
| Dundalk to Sopot | 4,937.99 mi (7,946.93 km) |
| Dundalk to Sozopol | 5,066.81 mi (8,154.24 km) |
| Dundalk to Sredets | 5,049.64 mi (8,126.61 km) |
| Dundalk to Stamboliyski | 4,950.52 mi (7,967.10 km) |
| Dundalk to Stara Zagora | 4,983.57 mi (8,020.29 km) |
| Dundalk to Svilengrad | 5,034.00 mi (8,101.44 km) |
| Dundalk to Svishtov | 4,922.18 mi (7,921.48 km) |
| Dundalk to Targovishte | 4,986.77 mi (8,025.44 km) |
| Dundalk to Teteven | 4,907.33 mi (7,897.58 km) |
| Dundalk to Troyan | 4,926.99 mi (7,929.23 km) |
| Dundalk to Tryavna | 4,959.38 mi (7,981.35 km) |
| Dundalk to Tutrakan | 4,954.43 mi (7,973.39 km) |
| Dundalk to Varna | 5,041.10 mi (8,112.86 km) |
