| Houthulst to Oria | 1,009.07 mi (1,623.94 km) |
| Houthulst to Oristano | 811.84 mi (1,306.52 km) |
| Houthulst to Orta Nova | 901.55 mi (1,450.91 km) |
| Houthulst to Orte | 737.75 mi (1,187.30 km) |
| Houthulst to Ortona | 804.48 mi (1,294.68 km) |
| Houthulst to Orvieto | 715.13 mi (1,150.90 km) |
| Houthulst to Orzinuovi | 501.54 mi (807.15 km) |
| Houthulst to Osimo | 714.45 mi (1,149.79 km) |
| Houthulst to Ospitaletto | 497.25 mi (800.24 km) |
| Houthulst to Ostuni | 994.97 mi (1,601.24 km) |
| Houthulst to Ottaviano | 890.42 mi (1,433.00 km) |
| Houthulst to Ovada | 511.20 mi (822.70 km) |
| Houthulst to Ozieri | 774.42 mi (1,246.32 km) |
| Houthulst to Paceco | 1,012.97 mi (1,630.21 km) |
| Houthulst to Pachino | 1,153.11 mi (1,855.75 km) |
