| Belfast to Smolyan | 1,655.20 mi (2,663.78 km) |
| Belfast to Sofia | 1,551.29 mi (2,496.55 km) |
| Belfast to Sopot | 1,607.33 mi (2,586.75 km) |
| Belfast to Sozopol | 1,731.08 mi (2,785.90 km) |
| Belfast to Sredets | 1,714.80 mi (2,759.71 km) |
| Belfast to Stamboliyski | 1,623.03 mi (2,612.01 km) |
| Belfast to Stara Zagora | 1,651.56 mi (2,657.92 km) |
| Belfast to Svilengrad | 1,703.32 mi (2,741.22 km) |
| Belfast to Svishtov | 1,586.88 mi (2,553.84 km) |
| Belfast to Targovishte | 1,650.69 mi (2,656.53 km) |
| Belfast to Teteven | 1,576.76 mi (2,537.55 km) |
| Belfast to Troyan | 1,595.41 mi (2,567.57 km) |
| Belfast to Tryavna | 1,626.09 mi (2,616.94 km) |
| Belfast to Tutrakan | 1,617.18 mi (2,602.60 km) |
| Belfast to Varna | 1,703.92 mi (2,742.19 km) |
