| Portlethen to Smolyan | 1,594.75 mi (2,566.50 km) |
| Portlethen to Sofia | 1,490.61 mi (2,398.90 km) |
| Portlethen to Sopot | 1,539.57 mi (2,477.71 km) |
| Portlethen to Sozopol | 1,650.61 mi (2,656.41 km) |
| Portlethen to Sredets | 1,637.08 mi (2,634.62 km) |
| Portlethen to Stamboliyski | 1,559.85 mi (2,510.33 km) |
| Portlethen to Stara Zagora | 1,580.74 mi (2,543.95 km) |
| Portlethen to Svilengrad | 1,634.09 mi (2,629.82 km) |
| Portlethen to Svishtov | 1,509.48 mi (2,429.27 km) |
| Portlethen to Targovishte | 1,569.95 mi (2,526.60 km) |
| Portlethen to Teteven | 1,509.65 mi (2,429.55 km) |
| Portlethen to Troyan | 1,526.23 mi (2,456.24 km) |
| Portlethen to Tryavna | 1,553.12 mi (2,499.50 km) |
| Portlethen to Tutrakan | 1,530.82 mi (2,463.62 km) |
| Portlethen to Varna | 1,617.34 mi (2,602.86 km) |
