| Porvoo to Oria | 1,416.80 mi (2,280.13 km) |
| Porvoo to Oristano | 1,593.82 mi (2,565.01 km) |
| Porvoo to Orta Nova | 1,383.24 mi (2,226.11 km) |
| Porvoo to Orte | 1,358.81 mi (2,186.80 km) |
| Porvoo to Ortona | 1,333.70 mi (2,146.39 km) |
| Porvoo to Orvieto | 1,346.86 mi (2,167.56 km) |
| Porvoo to Orzinuovi | 1,219.07 mi (1,961.90 km) |
| Porvoo to Osimo | 1,273.68 mi (2,049.79 km) |
| Porvoo to Ospitaletto | 1,206.44 mi (1,941.58 km) |
| Porvoo to Ostuni | 1,401.53 mi (2,255.54 km) |
| Porvoo to Ottaviano | 1,432.04 mi (2,304.64 km) |
| Porvoo to Ovada | 1,294.15 mi (2,082.74 km) |
| Porvoo to Ozieri | 1,542.19 mi (2,481.92 km) |
| Porvoo to Paceco | 1,650.71 mi (2,656.56 km) |
| Porvoo to Pachino | 1,700.92 mi (2,737.37 km) |
