| Allen to Smolyan | 6,074.47 mi (9,775.91 km) |
| Allen to Sofia | 5,970.40 mi (9,608.43 km) |
| Allen to Sopot | 6,024.82 mi (9,696.01 km) |
| Allen to Sozopol | 6,141.96 mi (9,884.53 km) |
| Allen to Sredets | 6,127.58 mi (9,861.39 km) |
| Allen to Stamboliyski | 6,041.81 mi (9,723.35 km) |
| Allen to Stara Zagora | 6,067.95 mi (9,765.43 km) |
| Allen to Svilengrad | 6,120.48 mi (9,849.96 km) |
| Allen to Svishtov | 5,999.60 mi (9,655.43 km) |
| Allen to Targovishte | 6,061.24 mi (9,754.62 km) |
| Allen to Teteven | 5,994.40 mi (9,647.05 km) |
| Allen to Troyan | 6,012.36 mi (9,675.95 km) |
| Allen to Tryavna | 6,041.42 mi (9,722.73 km) |
| Allen to Tutrakan | 6,022.99 mi (9,693.06 km) |
| Allen to Varna | 6,109.57 mi (9,832.40 km) |
