| Antrim to Smolyan | 1,668.41 mi (2,685.05 km) |
| Antrim to Sofia | 1,564.48 mi (2,517.78 km) |
| Antrim to Sopot | 1,620.39 mi (2,607.77 km) |
| Antrim to Sozopol | 1,743.88 mi (2,806.51 km) |
| Antrim to Sredets | 1,727.67 mi (2,780.41 km) |
| Antrim to Stamboliyski | 1,636.18 mi (2,633.18 km) |
| Antrim to Stara Zagora | 1,664.56 mi (2,678.86 km) |
| Antrim to Svilengrad | 1,716.37 mi (2,762.22 km) |
| Antrim to Svishtov | 1,599.73 mi (2,574.52 km) |
| Antrim to Targovishte | 1,663.47 mi (2,677.10 km) |
| Antrim to Teteven | 1,589.83 mi (2,558.59 km) |
| Antrim to Troyan | 1,608.45 mi (2,588.54 km) |
| Antrim to Tryavna | 1,639.05 mi (2,637.80 km) |
| Antrim to Tutrakan | 1,629.81 mi (2,622.92 km) |
| Antrim to Varna | 1,716.56 mi (2,762.54 km) |
