| Sankt Gallen to Oberkirch | 97.05 mi (156.18 km) |
| Sankt Gallen to Obernburg am Main | 167.24 mi (269.15 km) |
| Sankt Gallen to Obernkirchen | 334.75 mi (538.73 km) |
| Sankt Gallen to Oberschleissheim | 116.73 mi (187.86 km) |
| Sankt Gallen to Oberstdorf | 42.48 mi (68.37 km) |
| Sankt Gallen to Obertraubling | 167.10 mi (268.93 km) |
| Sankt Gallen to Obertshausen | 184.21 mi (296.46 km) |
| Sankt Gallen to Oberursel | 195.38 mi (314.44 km) |
| Sankt Gallen to Ochsenfurt | 157.05 mi (252.74 km) |
| Sankt Gallen to Ochsenhausen | 52.19 mi (83.99 km) |
| Sankt Gallen to Ochtrup | 344.33 mi (554.14 km) |
| Sankt Gallen to Odenthal | 269.27 mi (433.36 km) |
| Sankt Gallen to Oelde | 309.49 mi (498.07 km) |
| Sankt Gallen to Oelsnitz | 242.58 mi (390.39 km) |
| Sankt Gallen to Oer-Erkenschwick | 306.51 mi (493.29 km) |
