| Harstad to Orbetello | 1,831.68 mi (2,947.81 km) |
| Harstad to Oria | 1,955.83 mi (3,147.61 km) |
| Harstad to Oristano | 2,018.22 mi (3,248.01 km) |
| Harstad to Orta Nova | 1,898.26 mi (3,054.95 km) |
| Harstad to Orte | 1,826.23 mi (2,939.03 km) |
| Harstad to Ortona | 1,829.26 mi (2,943.90 km) |
| Harstad to Orvieto | 1,809.29 mi (2,911.77 km) |
| Harstad to Orzinuovi | 1,633.60 mi (2,629.03 km) |
| Harstad to Osimo | 1,752.75 mi (2,820.78 km) |
| Harstad to Ospitaletto | 1,622.23 mi (2,610.73 km) |
| Harstad to Ostuni | 1,939.68 mi (3,121.61 km) |
| Harstad to Ottaviano | 1,932.74 mi (3,110.44 km) |
| Harstad to Ovada | 1,692.87 mi (2,724.42 km) |
| Harstad to Ozieri | 1,969.34 mi (3,169.35 km) |
| Harstad to Paceco | 2,134.65 mi (3,435.38 km) |
