| Kallithea to Oerlinghausen | 1,210.71 mi (1,948.44 km) |
| Kallithea to Oestrich-Winkel | 1,136.75 mi (1,829.42 km) |
| Kallithea to Offenburg | 1,072.43 mi (1,725.91 km) |
| Kallithea to Oftersheim | 1,088.51 mi (1,751.79 km) |
| Kallithea to Ohrdruf | 1,092.74 mi (1,758.60 km) |
| Kallithea to Ohringen | 1,049.83 mi (1,689.55 km) |
| Kallithea to Olbernhau | 1,014.99 mi (1,633.46 km) |
| Kallithea to Olching | 942.16 mi (1,516.26 km) |
| Kallithea to Oldenburg | 1,283.84 mi (2,066.13 km) |
| Kallithea to Oldenburg in Holstein | 1,281.07 mi (2,061.69 km) |
| Kallithea to Olfen | 1,236.75 mi (1,990.36 km) |
| Kallithea to Olpe | 1,189.35 mi (1,914.08 km) |
| Kallithea to Olsberg | 1,185.31 mi (1,907.58 km) |
| Kallithea to Oranienburg | 1,139.37 mi (1,833.63 km) |
| Kallithea to Ortenberg | 1,119.14 mi (1,801.08 km) |
