| Frogn to Smolyan | 1,388.14 mi (2,233.99 km) |
| Frogn to Sofia | 1,291.25 mi (2,078.07 km) |
| Frogn to Sopot | 1,320.48 mi (2,125.11 km) |
| Frogn to Sozopol | 1,395.69 mi (2,246.15 km) |
| Frogn to Sredets | 1,389.07 mi (2,235.49 km) |
| Frogn to Stamboliyski | 1,349.59 mi (2,171.96 km) |
| Frogn to Stara Zagora | 1,351.84 mi (2,175.58 km) |
| Frogn to Svilengrad | 1,405.25 mi (2,261.52 km) |
| Frogn to Svishtov | 1,270.80 mi (2,045.15 km) |
| Frogn to Targovishte | 1,319.51 mi (2,123.54 km) |
| Frogn to Teteven | 1,294.25 mi (2,082.89 km) |
| Frogn to Troyan | 1,304.91 mi (2,100.06 km) |
| Frogn to Tryavna | 1,321.30 mi (2,126.42 km) |
| Frogn to Tutrakan | 1,270.36 mi (2,044.45 km) |
| Frogn to Varna | 1,350.80 mi (2,173.91 km) |
