| Knokke-Heist to Oestrich-Winkel | 226.19 mi (364.01 km) |
| Knokke-Heist to Offenburg | 286.61 mi (461.25 km) |
| Knokke-Heist to Oftersheim | 270.24 mi (434.91 km) |
| Knokke-Heist to Ohrdruf | 324.97 mi (522.98 km) |
| Knokke-Heist to Ohringen | 311.59 mi (501.45 km) |
| Knokke-Heist to Olbernhau | 438.93 mi (706.39 km) |
| Knokke-Heist to Olching | 418.59 mi (673.65 km) |
| Knokke-Heist to Oldenburg | 242.74 mi (390.65 km) |
| Knokke-Heist to Oldenburg in Holstein | 377.04 mi (606.78 km) |
| Knokke-Heist to Olfen | 177.95 mi (286.39 km) |
| Knokke-Heist to Olpe | 198.16 mi (318.91 km) |
| Knokke-Heist to Olsberg | 224.22 mi (360.84 km) |
| Knokke-Heist to Oranienburg | 433.54 mi (697.72 km) |
| Knokke-Heist to Ortenberg | 260.61 mi (419.41 km) |
| Knokke-Heist to Oschatz | 423.74 mi (681.94 km) |
