| Riihimaki to Oignies | 1,097.76 mi (1,766.67 km) |
| Riihimaki to Oissel | 1,212.08 mi (1,950.66 km) |
| Riihimaki to Olivet | 1,268.43 mi (2,041.34 km) |
| Riihimaki to Ollioules | 1,446.87 mi (2,328.51 km) |
| Riihimaki to Olonne-sur-Mer | 1,446.09 mi (2,327.25 km) |
| Riihimaki to Oloron-Sainte-Marie | 1,603.02 mi (2,579.80 km) |
| Riihimaki to Onet Village | 1,450.44 mi (2,334.26 km) |
| Riihimaki to Onnaing | 1,084.50 mi (1,745.34 km) |
| Riihimaki to Orange | 1,409.54 mi (2,268.43 km) |
| Riihimaki to Orchies | 1,090.19 mi (1,754.49 km) |
| Riihimaki to Orleans | 1,266.07 mi (2,037.54 km) |
| Riihimaki to Orly | 1,206.49 mi (1,941.66 km) |
| Riihimaki to Ormesson-sur-Marne | 1,200.11 mi (1,931.39 km) |
| Riihimaki to Orsay | 1,214.78 mi (1,955.00 km) |
| Riihimaki to Orthez | 1,590.28 mi (2,559.31 km) |
