| Kew Green to Orbetello | 825.81 mi (1,329.02 km) |
| Kew Green to Oria | 1,141.25 mi (1,836.67 km) |
| Kew Green to Oristano | 907.34 mi (1,460.22 km) |
| Kew Green to Orta Nova | 1,031.54 mi (1,660.11 km) |
| Kew Green to Orte | 861.34 mi (1,386.19 km) |
| Kew Green to Ortona | 934.05 mi (1,503.21 km) |
| Kew Green to Orvieto | 838.66 mi (1,349.69 km) |
| Kew Green to Orzinuovi | 628.25 mi (1,011.07 km) |
| Kew Green to Osimo | 845.20 mi (1,360.21 km) |
| Kew Green to Ospitaletto | 625.35 mi (1,006.40 km) |
| Kew Green to Ostuni | 1,127.58 mi (1,814.66 km) |
| Kew Green to Ottaviano | 1,015.68 mi (1,634.57 km) |
| Kew Green to Ovada | 627.10 mi (1,009.21 km) |
| Kew Green to Ozieri | 874.64 mi (1,407.59 km) |
| Kew Green to Paceco | 1,122.92 mi (1,807.17 km) |
