| Birkenhead to Smolyan | 1,514.99 mi (2,438.13 km) |
| Birkenhead to Sofia | 1,411.32 mi (2,271.30 km) |
| Birkenhead to Sopot | 1,468.55 mi (2,363.40 km) |
| Birkenhead to Sozopol | 1,594.73 mi (2,566.48 km) |
| Birkenhead to Sredets | 1,577.87 mi (2,539.33 km) |
| Birkenhead to Stamboliyski | 1,483.35 mi (2,387.22 km) |
| Birkenhead to Stara Zagora | 1,513.28 mi (2,435.40 km) |
| Birkenhead to Svilengrad | 1,564.61 mi (2,518.00 km) |
| Birkenhead to Svishtov | 1,450.20 mi (2,333.87 km) |
| Birkenhead to Targovishte | 1,514.62 mi (2,437.54 km) |
| Birkenhead to Teteven | 1,437.93 mi (2,314.12 km) |
| Birkenhead to Troyan | 1,456.94 mi (2,344.72 km) |
| Birkenhead to Tryavna | 1,488.33 mi (2,395.24 km) |
| Birkenhead to Tutrakan | 1,482.60 mi (2,386.01 km) |
| Birkenhead to Varna | 1,569.15 mi (2,525.30 km) |
