| Sankt Gallen to Oerlinghausen | 315.43 mi (507.63 km) |
| Sankt Gallen to Oestrich-Winkel | 188.62 mi (303.55 km) |
| Sankt Gallen to Offenburg | 98.05 mi (157.80 km) |
| Sankt Gallen to Oftersheim | 139.23 mi (224.07 km) |
| Sankt Gallen to Ohrdruf | 243.10 mi (391.24 km) |
| Sankt Gallen to Ohringen | 122.84 mi (197.69 km) |
| Sankt Gallen to Olbernhau | 286.96 mi (461.81 km) |
| Sankt Gallen to Olching | 105.00 mi (168.98 km) |
| Sankt Gallen to Oldenburg | 398.47 mi (641.27 km) |
| Sankt Gallen to Oldenburg in Holstein | 479.60 mi (771.84 km) |
| Sankt Gallen to Olfen | 309.63 mi (498.31 km) |
| Sankt Gallen to Olpe | 257.72 mi (414.76 km) |
| Sankt Gallen to Olsberg | 274.16 mi (441.22 km) |
| Sankt Gallen to Oranienburg | 406.06 mi (653.49 km) |
| Sankt Gallen to Ortenberg | 203.06 mi (326.79 km) |
