| Knokke-Heist to Oria | 1,014.57 mi (1,632.79 km) |
| Knokke-Heist to Oristano | 830.10 mi (1,335.92 km) |
| Knokke-Heist to Orta Nova | 908.36 mi (1,461.87 km) |
| Knokke-Heist to Orte | 747.81 mi (1,203.48 km) |
| Knokke-Heist to Ortona | 811.66 mi (1,306.24 km) |
| Knokke-Heist to Orvieto | 725.27 mi (1,167.20 km) |
| Knokke-Heist to Orzinuovi | 511.00 mi (822.38 km) |
| Knokke-Heist to Osimo | 721.20 mi (1,160.66 km) |
| Knokke-Heist to Ospitaletto | 506.06 mi (814.42 km) |
| Knokke-Heist to Ostuni | 1,000.23 mi (1,609.72 km) |
| Knokke-Heist to Ottaviano | 899.48 mi (1,447.57 km) |
| Knokke-Heist to Ovada | 524.89 mi (844.72 km) |
| Knokke-Heist to Ozieri | 791.68 mi (1,274.09 km) |
| Knokke-Heist to Paceco | 1,027.20 mi (1,653.12 km) |
| Knokke-Heist to Pachino | 1,165.20 mi (1,875.21 km) |
