| Riihimaki to Oria | 1,430.56 mi (2,302.26 km) |
| Riihimaki to Oristano | 1,596.17 mi (2,568.79 km) |
| Riihimaki to Orta Nova | 1,394.08 mi (2,243.55 km) |
| Riihimaki to Orte | 1,364.48 mi (2,195.91 km) |
| Riihimaki to Ortona | 1,342.23 mi (2,160.10 km) |
| Riihimaki to Orvieto | 1,351.98 mi (2,175.80 km) |
| Riihimaki to Orzinuovi | 1,219.00 mi (1,961.79 km) |
| Riihimaki to Osimo | 1,280.22 mi (2,060.31 km) |
| Riihimaki to Ospitaletto | 1,206.43 mi (1,941.56 km) |
| Riihimaki to Ostuni | 1,415.14 mi (2,277.44 km) |
| Riihimaki to Ottaviano | 1,441.43 mi (2,319.76 km) |
| Riihimaki to Ovada | 1,293.03 mi (2,080.93 km) |
| Riihimaki to Ozieri | 1,544.63 mi (2,485.84 km) |
| Riihimaki to Paceco | 1,658.93 mi (2,669.78 km) |
| Riihimaki to Pachino | 1,712.70 mi (2,756.33 km) |
