| Kallithea to Oegstgeest | 1,351.17 mi (2,174.49 km) |
| Kallithea to Oirschot | 1,293.78 mi (2,082.13 km) |
| Kallithea to Oisterwijk | 1,300.74 mi (2,093.34 km) |
| Kallithea to Oldebroek | 1,317.35 mi (2,120.06 km) |
| Kallithea to Oldenzaal | 1,279.33 mi (2,058.89 km) |
| Kallithea to Ommen | 1,304.60 mi (2,099.55 km) |
| Kallithea to Oosterend | 1,338.45 mi (2,154.03 km) |
| Kallithea to Oosterhout | 1,314.79 mi (2,115.96 km) |
| Kallithea to Oosterwolde | 1,331.09 mi (2,142.19 km) |
| Kallithea to Oostzaan | 1,348.69 mi (2,170.50 km) |
| Kallithea to Opmeer | 1,358.60 mi (2,186.46 km) |
| Kallithea to Oss | 1,298.39 mi (2,089.56 km) |
| Kallithea to Oud-Beijerland | 1,337.57 mi (2,152.61 km) |
| Kallithea to Oudenbosch | 1,323.71 mi (2,130.30 km) |
| Kallithea to Oudewater | 1,330.74 mi (2,141.61 km) |
