| Seia to Oberkirch | 955.98 mi (1,538.51 km) |
| Seia to Obernburg am Main | 1,043.54 mi (1,679.42 km) |
| Seia to Obernkirchen | 1,140.65 mi (1,835.69 km) |
| Seia to Oberschleissheim | 1,090.73 mi (1,755.36 km) |
| Seia to Oberstdorf | 1,013.49 mi (1,631.05 km) |
| Seia to Obertraubling | 1,135.43 mi (1,827.29 km) |
| Seia to Obertshausen | 1,040.53 mi (1,674.56 km) |
| Seia to Oberursel | 1,036.38 mi (1,667.90 km) |
| Seia to Ochsenfurt | 1,072.23 mi (1,725.59 km) |
| Seia to Ochsenhausen | 1,017.47 mi (1,637.47 km) |
| Seia to Ochtrup | 1,076.51 mi (1,732.47 km) |
| Seia to Odenthal | 1,020.23 mi (1,641.90 km) |
| Seia to Oelde | 1,089.89 mi (1,754.01 km) |
| Seia to Oelsnitz | 1,179.42 mi (1,898.09 km) |
| Seia to Oer-Erkenschwick | 1,052.15 mi (1,693.27 km) |
