| Kilkis to Opwijk | 1,126.22 mi (1,812.48 km) |
| Kilkis to Ostend | 1,182.72 mi (1,903.41 km) |
| Kilkis to Oud-Heverlee | 1,103.41 mi (1,775.76 km) |
| Kilkis to Oud-Turnhout | 1,109.48 mi (1,785.53 km) |
| Kilkis to Oudenaarde | 1,144.27 mi (1,841.53 km) |
| Kilkis to Oudenburg | 1,178.25 mi (1,896.21 km) |
| Kilkis to Oupeye | 1,062.59 mi (1,710.08 km) |
| Kilkis to Overijse | 1,106.64 mi (1,780.97 km) |
| Kilkis to Overpelt | 1,090.03 mi (1,754.23 km) |
| Kilkis to Paal | 1,092.18 mi (1,757.70 km) |
| Kilkis to Peer | 1,085.49 mi (1,746.93 km) |
| Kilkis to Pepinster | 1,050.92 mi (1,691.29 km) |
| Kilkis to Peruwelz | 1,133.90 mi (1,824.83 km) |
| Kilkis to Perwez | 1,090.43 mi (1,754.87 km) |
| Kilkis to Philippeville | 1,086.01 mi (1,747.76 km) |
