| Chalkida to Oberkirch | 1,039.75 mi (1,673.31 km) |
| Chalkida to Obernburg am Main | 1,060.00 mi (1,705.90 km) |
| Chalkida to Obernkirchen | 1,180.03 mi (1,899.07 km) |
| Chalkida to Oberschleissheim | 904.74 mi (1,456.04 km) |
| Chalkida to Oberstdorf | 911.91 mi (1,467.58 km) |
| Chalkida to Obertraubling | 921.11 mi (1,482.38 km) |
| Chalkida to Obertshausen | 1,080.67 mi (1,739.17 km) |
| Chalkida to Oberursel | 1,095.42 mi (1,762.91 km) |
| Chalkida to Ochsenfurt | 1,020.90 mi (1,642.99 km) |
| Chalkida to Ochsenhausen | 952.45 mi (1,532.82 km) |
| Chalkida to Ochtrup | 1,233.65 mi (1,985.37 km) |
| Chalkida to Odenthal | 1,181.36 mi (1,901.22 km) |
| Chalkida to Oelde | 1,186.51 mi (1,909.50 km) |
| Chalkida to Oelsnitz | 997.52 mi (1,605.35 km) |
| Chalkida to Oer-Erkenschwick | 1,205.10 mi (1,939.41 km) |
