| Porsgrunn to Popovo | 1,295.04 mi (2,084.17 km) |
| Porsgrunn to Provadia | 1,333.25 mi (2,145.65 km) |
| Porsgrunn to Radnevo | 1,353.46 mi (2,178.18 km) |
| Porsgrunn to Radomir | 1,276.74 mi (2,054.72 km) |
| Porsgrunn to Rakitovo | 1,334.90 mi (2,148.32 km) |
| Porsgrunn to Rakovski | 1,333.50 mi (2,146.05 km) |
| Porsgrunn to Razgrad | 1,290.32 mi (2,076.56 km) |
| Porsgrunn to Razlog | 1,329.33 mi (2,139.34 km) |
| Porsgrunn to Ruse | 1,259.58 mi (2,027.10 km) |
| Porsgrunn to Samokov | 1,301.97 mi (2,095.32 km) |
| Porsgrunn to Sandanski | 1,346.12 mi (2,166.37 km) |
| Porsgrunn to Sevlievo | 1,290.34 mi (2,076.60 km) |
| Porsgrunn to Shumen | 1,315.33 mi (2,116.82 km) |
| Porsgrunn to Silistra | 1,272.53 mi (2,047.94 km) |
| Porsgrunn to Sliven | 1,338.48 mi (2,154.08 km) |
