| Porsgrunn to Devnya | 1,334.40 mi (2,147.51 km) |
| Porsgrunn to Dimitrovgrad | 1,361.91 mi (2,191.78 km) |
| Porsgrunn to Dobrich | 1,319.66 mi (2,123.79 km) |
| Porsgrunn to Dospat | 1,357.82 mi (2,185.20 km) |
| Porsgrunn to Dupnitsa | 1,298.22 mi (2,089.28 km) |
| Porsgrunn to Elhovo | 1,375.77 mi (2,214.09 km) |
| Porsgrunn to Etropole | 1,279.21 mi (2,058.69 km) |
| Porsgrunn to Gabrovo | 1,305.01 mi (2,100.21 km) |
| Porsgrunn to Gorna Oryahovitsa | 1,296.44 mi (2,086.42 km) |
| Porsgrunn to Gotse Delchev | 1,354.74 mi (2,180.24 km) |
| Porsgrunn to Harmanli | 1,375.68 mi (2,213.94 km) |
| Porsgrunn to Haskovo | 1,368.53 mi (2,202.44 km) |
| Porsgrunn to Ihtiman | 1,300.69 mi (2,093.25 km) |
| Porsgrunn to Isperih | 1,286.54 mi (2,070.48 km) |
| Porsgrunn to Kardzhali | 1,382.17 mi (2,224.40 km) |
