| Portlethen to Devnya | 1,605.29 mi (2,583.46 km) |
| Portlethen to Dimitrovgrad | 1,599.26 mi (2,573.76 km) |
| Portlethen to Dobrich | 1,596.92 mi (2,570.00 km) |
| Portlethen to Dospat | 1,573.95 mi (2,533.03 km) |
| Portlethen to Dupnitsa | 1,507.16 mi (2,425.54 km) |
| Portlethen to Elhovo | 1,625.28 mi (2,615.64 km) |
| Portlethen to Etropole | 1,505.30 mi (2,422.55 km) |
| Portlethen to Gabrovo | 1,547.57 mi (2,490.57 km) |
| Portlethen to Gorna Oryahovitsa | 1,546.05 mi (2,488.12 km) |
| Portlethen to Gotse Delchev | 1,564.61 mi (2,518.00 km) |
| Portlethen to Harmanli | 1,615.35 mi (2,599.65 km) |
| Portlethen to Haskovo | 1,604.34 mi (2,581.93 km) |
| Portlethen to Ihtiman | 1,520.34 mi (2,446.75 km) |
| Portlethen to Isperih | 1,554.92 mi (2,502.41 km) |
| Portlethen to Kardzhali | 1,612.86 mi (2,595.64 km) |
