| Porvoo to Navodari | 1,117.23 mi (1,798.01 km) |
| Porvoo to Negresti-Oas | 870.00 mi (1,400.13 km) |
| Porvoo to Nehoiu | 1,039.58 mi (1,673.05 km) |
| Porvoo to Ocna Mures | 970.37 mi (1,561.66 km) |
| Porvoo to Odobesti | 1,012.29 mi (1,629.13 km) |
| Porvoo to Odorheiu Secuiesc | 972.98 mi (1,565.86 km) |
| Porvoo to Oltenita | 1,127.47 mi (1,814.49 km) |
| Porvoo to Onesti | 977.72 mi (1,573.49 km) |
| Porvoo to Oradea | 932.72 mi (1,501.07 km) |
| Porvoo to Orastie | 1,009.92 mi (1,625.31 km) |
| Porvoo to Oravita | 1,073.37 mi (1,727.42 km) |
| Porvoo to Orsova | 1,090.96 mi (1,755.74 km) |
| Porvoo to Otelu Rosu | 1,036.69 mi (1,668.39 km) |
| Porvoo to Otopeni | 1,094.87 mi (1,762.02 km) |
| Porvoo to Ovidiu | 1,120.51 mi (1,803.29 km) |
