| Porsgrunn to Olivenza | 1,594.48 mi (2,566.07 km) |
| Porsgrunn to Olot | 1,210.31 mi (1,947.81 km) |
| Porsgrunn to Onate | 1,225.15 mi (1,971.69 km) |
| Porsgrunn to Onda | 1,393.32 mi (2,242.33 km) |
| Porsgrunn to Onteniente | 1,474.17 mi (2,372.46 km) |
| Porsgrunn to Orihuela | 1,528.06 mi (2,459.18 km) |
| Porsgrunn to Osuna | 1,650.15 mi (2,655.66 km) |
| Porsgrunn to Ourense | 1,381.59 mi (2,223.45 km) |
| Porsgrunn to Oviedo | 1,272.78 mi (2,048.34 km) |
| Porsgrunn to Paiporta | 1,431.13 mi (2,303.19 km) |
| Porsgrunn to Pajara | 2,406.74 mi (3,873.27 km) |
| Porsgrunn to Palafolls | 1,242.19 mi (1,999.11 km) |
| Porsgrunn to Palafrugell | 1,221.19 mi (1,965.31 km) |
| Porsgrunn to Palamos | 1,226.38 mi (1,973.67 km) |
| Porsgrunn to Palencia | 1,330.21 mi (2,140.76 km) |
