| Millbrook to Smolyan | 5,703.06 mi (9,178.19 km) |
| Millbrook to Sofia | 5,600.58 mi (9,013.26 km) |
| Millbrook to Sopot | 5,660.30 mi (9,109.37 km) |
| Millbrook to Sozopol | 5,788.14 mi (9,315.12 km) |
| Millbrook to Sredets | 5,771.24 mi (9,287.91 km) |
| Millbrook to Stamboliyski | 5,673.17 mi (9,130.08 km) |
| Millbrook to Stara Zagora | 5,705.71 mi (9,182.46 km) |
| Millbrook to Svilengrad | 5,756.34 mi (9,263.94 km) |
| Millbrook to Svishtov | 5,643.62 mi (9,082.53 km) |
| Millbrook to Targovishte | 5,707.97 mi (9,186.08 km) |
| Millbrook to Teteven | 5,629.64 mi (9,060.03 km) |
| Millbrook to Troyan | 5,649.18 mi (9,091.47 km) |
| Millbrook to Tryavna | 5,681.30 mi (9,143.17 km) |
| Millbrook to Tutrakan | 5,674.92 mi (9,132.90 km) |
| Millbrook to Varna | 5,761.66 mi (9,272.50 km) |
