| Sankt Gallen to Orbetello | 355.97 mi (572.88 km) |
| Sankt Gallen to Oria | 629.93 mi (1,013.78 km) |
| Sankt Gallen to Oristano | 520.92 mi (838.34 km) |
| Sankt Gallen to Orta Nova | 524.30 mi (843.78 km) |
| Sankt Gallen to Orte | 373.25 mi (600.70 km) |
| Sankt Gallen to Ortona | 428.19 mi (689.11 km) |
| Sankt Gallen to Orvieto | 351.49 mi (565.67 km) |
| Sankt Gallen to Orzinuovi | 142.40 mi (229.17 km) |
| Sankt Gallen to Osimo | 337.34 mi (542.90 km) |
| Sankt Gallen to Ospitaletto | 133.38 mi (214.66 km) |
| Sankt Gallen to Ostuni | 615.65 mi (990.79 km) |
| Sankt Gallen to Ottaviano | 519.77 mi (836.49 km) |
| Sankt Gallen to Ovada | 195.53 mi (314.68 km) |
| Sankt Gallen to Ozieri | 472.90 mi (761.06 km) |
| Sankt Gallen to Paceco | 671.82 mi (1,081.19 km) |
