| Olecko to Orbetello | 952.18 mi (1,532.39 km) |
| Olecko to Oria | 961.92 mi (1,548.06 km) |
| Olecko to Oristano | 1,171.32 mi (1,885.05 km) |
| Olecko to Orta Nova | 931.69 mi (1,499.41 km) |
| Olecko to Orte | 923.10 mi (1,485.58 km) |
| Olecko to Ortona | 887.92 mi (1,428.97 km) |
| Olecko to Orvieto | 913.60 mi (1,470.30 km) |
| Olecko to Orzinuovi | 816.80 mi (1,314.51 km) |
| Olecko to Osimo | 835.15 mi (1,344.05 km) |
| Olecko to Ospitaletto | 804.18 mi (1,294.21 km) |
| Olecko to Ostuni | 946.71 mi (1,523.58 km) |
| Olecko to Ottaviano | 983.51 mi (1,582.80 km) |
| Olecko to Ovada | 897.11 mi (1,443.76 km) |
| Olecko to Ozieri | 1,119.76 mi (1,802.08 km) |
| Olecko to Paceco | 1,204.63 mi (1,938.67 km) |
