| Porsgrunn to Karlovo | 1,307.80 mi (2,104.71 km) |
| Porsgrunn to Karnobat | 1,356.37 mi (2,182.87 km) |
| Porsgrunn to Kavarna | 1,339.99 mi (2,156.51 km) |
| Porsgrunn to Kazanlak | 1,322.09 mi (2,127.69 km) |
| Porsgrunn to Knezha | 1,238.83 mi (1,993.70 km) |
| Porsgrunn to Kostinbrod | 1,264.77 mi (2,035.45 km) |
| Porsgrunn to Kozloduy | 1,213.77 mi (1,953.38 km) |
| Porsgrunn to Kyustendil | 1,288.92 mi (2,074.32 km) |
| Porsgrunn to Levski | 1,269.49 mi (2,043.04 km) |
| Porsgrunn to Lom | 1,201.04 mi (1,932.89 km) |
| Porsgrunn to Lovech | 1,275.05 mi (2,052.00 km) |
| Porsgrunn to Lukovit | 1,259.44 mi (2,026.87 km) |
| Porsgrunn to Lyaskovets | 1,298.88 mi (2,090.34 km) |
| Porsgrunn to Mezdra | 1,253.10 mi (2,016.66 km) |
| Porsgrunn to Momchilgrad | 1,390.59 mi (2,237.94 km) |
