| Glen Rock to Smolyan | 4,809.52 mi (7,740.17 km) |
| Glen Rock to Sofia | 4,707.13 mi (7,575.39 km) |
| Glen Rock to Sopot | 4,767.11 mi (7,671.93 km) |
| Glen Rock to Sozopol | 4,895.76 mi (7,878.97 km) |
| Glen Rock to Sredets | 4,878.63 mi (7,851.39 km) |
| Glen Rock to Stamboliyski | 4,779.75 mi (7,692.26 km) |
| Glen Rock to Stara Zagora | 4,812.66 mi (7,745.23 km) |
| Glen Rock to Svilengrad | 4,863.13 mi (7,826.46 km) |
| Glen Rock to Svishtov | 4,751.14 mi (7,646.23 km) |
| Glen Rock to Targovishte | 4,815.71 mi (7,750.14 km) |
| Glen Rock to Teteven | 4,736.45 mi (7,622.58 km) |
| Glen Rock to Troyan | 4,756.08 mi (7,654.18 km) |
| Glen Rock to Tryavna | 4,788.42 mi (7,706.22 km) |
| Glen Rock to Tutrakan | 4,783.31 mi (7,697.99 km) |
| Glen Rock to Varna | 4,869.98 mi (7,837.47 km) |
