| Piraeus to Octeville | 1,486.57 mi (2,392.40 km) |
| Piraeus to Oignies | 1,331.87 mi (2,143.43 km) |
| Piraeus to Oissel | 1,366.98 mi (2,199.95 km) |
| Piraeus to Olivet | 1,289.78 mi (2,075.70 km) |
| Piraeus to Ollioules | 998.76 mi (1,607.35 km) |
| Piraeus to Olonne-sur-Mer | 1,421.13 mi (2,287.08 km) |
| Piraeus to Oloron-Sainte-Marie | 1,318.37 mi (2,121.72 km) |
| Piraeus to Onet Village | 1,177.50 mi (1,895.00 km) |
| Piraeus to Onnaing | 1,306.49 mi (2,102.60 km) |
| Piraeus to Orange | 1,067.74 mi (1,718.36 km) |
| Piraeus to Orchies | 1,322.81 mi (2,128.86 km) |
| Piraeus to Orleans | 1,290.52 mi (2,076.88 km) |
| Piraeus to Orly | 1,295.72 mi (2,085.26 km) |
| Piraeus to Ormesson-sur-Marne | 1,291.17 mi (2,077.93 km) |
| Piraeus to Orsay | 1,302.62 mi (2,096.37 km) |
