| Ontario to Nyon | 5,873.84 mi (9,453.04 km) |
| Ontario to Oberriet | 5,932.95 mi (9,548.16 km) |
| Ontario to Obersiggenthal | 5,884.38 mi (9,470.00 km) |
| Ontario to Oberwil | 5,859.72 mi (9,430.32 km) |
| Ontario to Oberwingert | 5,897.79 mi (9,491.57 km) |
| Ontario to Oftringen | 5,881.20 mi (9,464.88 km) |
| Ontario to Olten | 5,878.98 mi (9,461.30 km) |
| Ontario to Onex | 5,879.43 mi (9,462.02 km) |
| Ontario to Opfikon | 5,895.75 mi (9,488.29 km) |
| Ontario to Ostermundigen | 5,885.93 mi (9,472.48 km) |
| Ontario to Payerne | 5,874.98 mi (9,454.86 km) |
| Ontario to Pfaffikon | 5,905.95 mi (9,504.71 km) |
| Ontario to Plan-les-Ouates | 5,880.81 mi (9,464.24 km) |
| Ontario to Pratteln | 5,864.17 mi (9,437.48 km) |
| Ontario to Prilly | 5,878.37 mi (9,460.32 km) |
